aboutsummaryrefslogtreecommitdiffstats
path: root/erts
diff options
context:
space:
mode:
authorLukas Larsson <[email protected]>2018-03-07 11:24:43 +0100
committerGitHub <[email protected]>2018-03-07 11:24:43 +0100
commit41a22ab0ad052253df06bc76b242ab25faf8804d (patch)
tree7e08fff23ddf26f3e8e7cb99aae833acf752dc11 /erts
parent64dc3c39cbd19d6b75e5b74cfdfdd57419d4c455 (diff)
parent3aa27a437b27d2c02357ed28360b67e3005e49d3 (diff)
downloadotp-41a22ab0ad052253df06bc76b242ab25faf8804d.tar.gz
otp-41a22ab0ad052253df06bc76b242ab25faf8804d.tar.bz2
otp-41a22ab0ad052253df06bc76b242ab25faf8804d.zip
Merge pull request #1733 from garazdawi/lukas/erts/cleanup_system_info_docs
Cleanup erlang:system_info docs
Diffstat (limited to 'erts')
-rw-r--r--erts/doc/src/erlang.xml1594
-rw-r--r--erts/doc/src/notes.xml2
-rw-r--r--erts/preloaded/src/erlang.erl9
3 files changed, 939 insertions, 666 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 771897ba94..56eaa47af4 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -6753,17 +6753,20 @@ lists:map(
be included in the result. That is, all scheduler threads
that are expected to handle CPU bound work. If you also
want information about dirty I/O schedulers, use
- <seealso marker="#statistics_scheduler_wall_time_all"><c>statistics(scheduler_wall_time_all)</c></seealso>
+ <seealso marker="#statistics_scheduler_wall_time_all">
+ <c>statistics(scheduler_wall_time_all)</c></seealso>
instead.</p>
<p>Normal schedulers will have scheduler identifiers in
the range <c>1 =&lt; <anno>SchedulerId</anno> =&lt;
- </c><seealso marker="#system_info_schedulers"><c>erlang:system_info(schedulers)</c></seealso>.
+ </c><seealso marker="#system_info_schedulers">
+ <c>erlang:system_info(schedulers)</c></seealso>.
Dirty CPU schedulers will have scheduler identifiers in
the range <c>erlang:system_info(schedulers) &lt;
<anno>SchedulerId</anno> =&lt; erlang:system_info(schedulers)
+
- </c><seealso marker="#system_info_dirty_cpu_schedulers"><c>erlang:system_info(dirty_cpu_schedulers)</c></seealso>.
+ </c><seealso marker="#system_info_dirty_cpu_schedulers">
+ <c>erlang:system_info(dirty_cpu_schedulers)</c></seealso>.
</p>
<note><p>The different types of schedulers handle
specific types of jobs. Every job is assigned to a specific
@@ -6839,13 +6842,16 @@ ok
schedulers.</p>
<p>Dirty IO schedulers will have scheduler identifiers in
the range
- <seealso marker="#system_info_schedulers"><c>erlang:system_info(schedulers)</c></seealso><c>
+ <seealso marker="#system_info_schedulers">
+ <c>erlang:system_info(schedulers)</c></seealso><c>
+
- </c><seealso marker="#system_info_dirty_cpu_schedulers"><c>erlang:system_info(dirty_cpu_schedulers)</c></seealso><c> &lt;
+ </c><seealso marker="#system_info_dirty_cpu_schedulers">
+ <c>erlang:system_info(dirty_cpu_schedulers)</c></seealso><c> &lt;
<anno>SchedulerId</anno> =&lt; erlang:system_info(schedulers)
+ erlang:system_info(dirty_cpu_schedulers)
+
- </c><seealso marker="#system_info_dirty_io_schedulers"><c>erlang:system_info(dirty_io_schedulers)</c></seealso>.</p>
+ </c><seealso marker="#system_info_dirty_io_schedulers">
+ <c>erlang:system_info(dirty_io_schedulers)</c></seealso>.</p>
<note><p>Note that work executing on dirty I/O schedulers
are expected to mainly wait for I/O. That is, when you
get high scheduler utilization on dirty I/O schedulers,
@@ -7484,11 +7490,144 @@ ok
</func>
<func>
- <name name="system_info" arity="1" clause_i="1"/>
- <name name="system_info" arity="1" clause_i="2"/>
- <name name="system_info" arity="1" clause_i="3"/>
- <name name="system_info" arity="1" clause_i="4"/>
- <name name="system_info" arity="1" clause_i="5"/>
+ <name name="system_info" arity="1" clause_i="75"/>
+ <fsummary>System info overview.</fsummary>
+ <desc>
+ <p>Returns information about the current system.
+ The documentation of this function is broken into the following
+ sections in order to make it easier to navigate.</p>
+ <taglist>
+ <tag><seealso marker="#system_info_allocator">
+ <c>Memory Allocation</c></seealso></tag>
+ <item>
+ <p>
+ <seealso marker="#system_info_allocated_areas"><c>allocated_areas</c></seealso>,
+ <seealso marker="#system_info_allocator"><c>allocator</c></seealso>,
+ <seealso marker="#system_info_alloc_util_allocators"><c>alloc_util_allocators</c></seealso>,
+ <seealso marker="#system_info_allocator_sizes"><c>allocator_sizes</c></seealso>,
+ <seealso marker="#system_info_elib_malloc"><c>elib_malloc</c></seealso>
+ </p>
+ </item>
+ <tag><seealso marker="#system_info_cpu_topology">
+ <c>CPU Topology</c></seealso></tag>
+ <item>
+ <p>
+ <seealso marker="#system_info_cpu_topology"><c>cpu_topology</c></seealso>,
+ <seealso marker="#system_info_logical_processors"><c>logical_processors</c></seealso>,
+ <seealso marker="#system_info_update_cpu_info"><c>update_cpu_info</c></seealso>
+ </p>
+ </item>
+ <tag><seealso marker="#system_info_process">
+ <c>Process Information</c></seealso></tag>
+ <item>
+ <p>
+ <seealso marker="#system_info_fullsweep_after"><c>fullsweep_after</c></seealso>,
+ <seealso marker="#system_info_garbage_collection"><c>garbage_collection</c></seealso>,
+ <seealso marker="#system_info_heap_sizes"><c>heap_sizes</c></seealso>,
+ <seealso marker="#system_info_heap_type"><c>heap_type</c></seealso>,
+ <seealso marker="#system_info_max_heap_size"><c>max_heap_size</c></seealso>,
+ <seealso marker="#system_info_message_queue_data"><c>message_queue_data</c></seealso>,
+ <seealso marker="#system_info_min_heap_size"><c>min_heap_size</c></seealso>,
+ <seealso marker="#system_info_min_bin_vheap_size"><c>min_bin_vheap_size</c></seealso>,
+ <seealso marker="#system_info_procs"><c>procs</c></seealso>
+ </p>
+ </item>
+ <tag><seealso marker="#system_info_limits">
+ <c>System Limits</c></seealso></tag>
+ <item>
+ <p>
+ <seealso marker="#system_info_atom_count"><c>atom_count</c></seealso>,
+ <seealso marker="#system_info_atom_limit"><c>atom_limit</c></seealso>,
+ <seealso marker="#system_info_ets_limit"><c>ets_limit</c></seealso>,
+ <seealso marker="#system_info_port_count"><c>port_count</c></seealso>,
+ <seealso marker="#system_info_port_limit"><c>port_limit</c></seealso>,
+ <seealso marker="#system_info_process_count"><c>process_count</c></seealso>,
+ <seealso marker="#system_info_process_limit"><c>process_limit</c></seealso>
+ </p>
+ </item>
+ <tag><seealso marker="#system_info_time">
+ <c>System Time</c></seealso></tag>
+ <item>
+ <p>
+ <seealso marker="#system_info_end_time"><c>end_time</c></seealso>,
+ <seealso marker="#system_info_os_monotonic_time_source"><c>os_monotonic_time_source</c></seealso>,
+ <seealso marker="#system_info_os_system_time_source"><c>os_system_time_source</c></seealso>,
+ <seealso marker="#system_info_start_time"><c>start_time</c></seealso>,
+ <seealso marker="#system_info_time_correction"><c>time_correction</c></seealso>,
+ <seealso marker="#system_info_time_offset"><c>time_offset</c></seealso>,
+ <seealso marker="#system_info_time_warp_mode"><c>time_warp_mode</c></seealso>,
+ <seealso marker="#system_info_tolerant_timeofday"><c>tolerant_timeofday</c></seealso>
+ </p>
+ </item>
+ <tag><seealso marker="#system_info_scheduler">
+ <c>Scheduler Information</c></seealso></tag>
+ <item>
+ <p>
+ <seealso marker="#system_info_dirty_cpu_schedulers"><c>dirty_cpu_schedulers</c></seealso>,
+ <seealso marker="#system_info_dirty_cpu_schedulers_online"><c>dirty_cpu_schedulers_online</c></seealso>,
+ <seealso marker="#system_info_dirty_io_schedulers"><c>dirty_io_schedulers</c></seealso>,
+ <seealso marker="#system_info_multi_scheduling"><c>multi_scheduling</c></seealso>,
+ <seealso marker="#system_info_multi_scheduling_blockers"><c>multi_scheduling_blockers</c></seealso>,
+ <seealso marker="#system_info_normal_multi_scheduling_blockers"><c>normal_multi_scheduling_blockers</c></seealso>,
+ <seealso marker="#system_info_scheduler_bind_type"><c>scheduler_bind_type</c></seealso>,
+ <seealso marker="#system_info_scheduler_bindings"><c>scheduler_bindings</c></seealso>,
+ <seealso marker="#system_info_scheduler_id"><c>scheduler_id</c></seealso>,
+ <seealso marker="#system_info_schedulers"><c>schedulers</c></seealso>,
+ <seealso marker="#system_info_smp_support"><c>smp_support</c></seealso>,
+ <seealso marker="#system_info_threads"><c>threads</c></seealso>,
+ <seealso marker="#system_info_thread_pool_size"><c>thread_pool_size</c></seealso>
+ </p>
+ </item>
+ <tag><seealso marker="#system_info_dist">
+ <c>Distribution Information</c></seealso></tag>
+ <item>
+ <p>
+ <seealso marker="#system_info_creation"><c>creation</c></seealso>,
+ <seealso marker="#system_info_delayed_node_table_gc"><c>delayed_node_table_gc</c></seealso>,
+ <seealso marker="#system_info_dist"><c>dist</c></seealso>,
+ <seealso marker="#system_info_dist_buf_busy_limit"><c>dist_buf_busy_limit</c></seealso>,
+ <seealso marker="#system_info_dist_ctrl"><c>dist_ctrl</c></seealso>
+ </p>
+ </item>
+ <tag><seealso marker="#system_info_misc">
+ <c>System Information</c></seealso></tag>
+ <item>
+ <p>
+ <seealso marker="#system_info_build_type"><c>build_type</c></seealso>,
+ <seealso marker="#system_info_c_compiler_used"><c>c_compiler_used</c></seealso>,
+ <seealso marker="#system_info_check_io"><c>check_io</c></seealso>,
+ <seealso marker="#system_info_compat_rel"><c>compat_rel</c></seealso>,
+ <seealso marker="#system_info_debug_compiled"><c>debug_compiled</c></seealso>,
+ <seealso marker="#system_info_driver_version"><c>driver_version</c></seealso>,
+ <seealso marker="#system_info_dynamic_trace"><c>dynamic_trace</c></seealso>,
+ <seealso marker="#system_info_dynamic_trace_probes"><c>dynamic_trace_probes</c></seealso>,
+ <seealso marker="#system_info_info"><c>info</c></seealso>,
+ <seealso marker="#system_info_kernel_poll"><c>kernel_poll</c></seealso>,
+ <seealso marker="#system_info_loaded"><c>loaded</c></seealso>,
+ <seealso marker="#system_info_machine"><c>machine</c></seealso>,
+ <seealso marker="#system_info_modified_timing_level"><c>modified_timing_level</c></seealso>,
+ <seealso marker="#system_info_nif_version"><c>nif_version</c></seealso>,
+ <seealso marker="#system_info_otp_release"><c>otp_release</c></seealso>,
+ <seealso marker="#system_info_port_parallelism"><c>port_parallelism</c></seealso>,
+ <seealso marker="#system_info_system_version"><c>system_version</c></seealso>,
+ <seealso marker="#system_info_system_architecture"><c>system_architecture</c></seealso>,
+ <seealso marker="#system_info_trace_control_word"><c>trace_control_word</c></seealso>,
+ <seealso marker="#system_info_version"><c>version</c></seealso>,
+ <seealso marker="#system_info_wordsize"><c>wordsize</c></seealso>
+ </p>
+ </item>
+ </taglist>
+ </desc>
+ </func>
+
+ <func>
+ <name name="system_info" arity="1" clause_i="1"
+ anchor="system_info_allocator"/> <!-- allocated_areas -->
+ <name name="system_info" arity="1" clause_i="2"/> <!-- allocator -->
+ <name name="system_info" arity="1" clause_i="3"/> <!-- {allocator, _} -->
+ <name name="system_info" arity="1" clause_i="4"/> <!-- alloc_util_allocators -->
+ <name name="system_info" arity="1" clause_i="5"/> <!-- {allocator_sizes, _} -->
+ <name name="system_info" arity="1" clause_i="27"/> <!-- elib_malloc -->
<fsummary>Information about the system allocators.</fsummary>
<type variable="Allocator" name_i="2"/>
<type variable="Version" name_i="2"/>
@@ -7497,12 +7636,13 @@ ok
<type variable="Alloc" name_i="3"/>
<desc>
<marker id="system_info_allocator_tags"></marker>
- <p>Returns various information about the allocators of the
- current system (emulator) as specified by
+ <p>Returns various information about the memory allocators
+ of the current system (emulator) as specified by
<c><anno>Item</anno></c>:</p>
<marker id="system_info_allocated_areas"></marker>
<taglist>
- <tag><c>allocated_areas</c></tag>
+ <tag><marker id="system_info_allocated_areas"/>
+ <c>allocated_areas</c></tag>
<item>
<p>Returns a list of tuples with information about
miscellaneous allocated memory areas.</p>
@@ -7524,9 +7664,9 @@ ok
<seealso marker="#memory/0">
<c>erlang:memory/0,1</c></seealso>.</p>
</item>
- <tag><c>allocator</c></tag>
+ <tag><marker id="system_info_allocator"/>
+ <c>allocator</c></tag>
<item>
- <marker id="system_info_allocator"></marker>
<p>Returns <c>{<anno>Allocator</anno>, <anno>Version</anno>,
<anno>Features</anno>, <anno>Settings</anno></c>, where:</p>
<list type="bulleted">
@@ -7559,19 +7699,9 @@ ok
<seealso marker="erts:erts_alloc#flags">
<c>erts_alloc(3)</c></seealso>.</p>
</item>
- <tag><c>alloc_util_allocators</c></tag>
- <item>
- <marker id="system_info_alloc_util_allocators"></marker>
- <p>Returns a list of the names of all allocators using
- the ERTS internal <c>alloc_util</c> framework
- as atoms. For more information, see section
- <seealso marker="erts:erts_alloc#alloc_util">The
- alloc_util framework</seealso>
- in <c>erts_alloc(3)</c>.</p>
- </item>
- <tag><c>{allocator, <anno>Alloc</anno>}</c></tag>
+ <tag><marker id="system_info_allocator_tuple"></marker>
+ <c>{allocator, <anno>Alloc</anno>}</c></tag>
<item>
- <marker id="system_info_allocator_tuple"></marker>
<p>Returns information about the specified allocator.
As from ERTS 5.6.1, the return value is a list
of <c>{instance, InstanceNo, InstanceInfo}</c> tuples,
@@ -7616,9 +7746,19 @@ ok
values. The first value is the memory pool size and
the second value is the used memory size.</p>
</item>
- <tag><c>{allocator_sizes, <anno>Alloc</anno>}</c></tag>
+ <tag><marker id="system_info_alloc_util_allocators"/>
+ <c>alloc_util_allocators</c></tag>
+ <item>
+ <p>Returns a list of the names of all allocators using
+ the ERTS internal <c>alloc_util</c> framework
+ as atoms. For more information, see section
+ <seealso marker="erts:erts_alloc#alloc_util">The
+ alloc_util framework</seealso>
+ in <c>erts_alloc(3)</c>.</p>
+ </item>
+ <tag><marker id="system_info_allocator_sizes"/>
+ <c>{allocator_sizes, <anno>Alloc</anno>}</c></tag>
<item>
- <marker id="system_info_allocator_sizes"></marker>
<p>Returns various size information for the specified
allocator. The information returned is a subset of the
information returned by
@@ -7626,14 +7766,23 @@ ok
<c>erlang:system_info({allocator,
<anno>Alloc</anno>})</c></seealso>.</p>
</item>
+ <tag><marker id="system_info_elib_malloc"/>
+ <c>elib_malloc</c></tag>
+ <item>
+ <p>This option will be removed in a future release.
+ The return value will always be <c>false</c>, as the
+ <c>elib_malloc</c> allocator has been removed.</p>
+ </item>
</taglist>
</desc>
</func>
<func>
<name name="system_info" arity="1" clause_i="12"
- anchor="system_info_cpu_topology"/>
- <name name="system_info" arity="1" clause_i="13"/>
+ anchor="system_info_cpu_topology"/> <!-- cpu_topology -->
+ <name name="system_info" arity="1" clause_i="13"/> <!-- {cpu_topology, _} -->
+ <name name="system_info" arity="1" clause_i="37"/> <!-- logical_processors -->
+ <name name="system_info" arity="1" clause_i="72"/> <!-- update_cpu_info -->
<fsummary>Information about the CPU topology of the system.</fsummary>
<type name="cpu_topology"/>
<type name="level_entry"/>
@@ -7664,7 +7813,8 @@ ok
the current system (emulator) as specified by
<c><anno>Item</anno></c>:</p>
<taglist>
- <tag><c>cpu_topology</c></tag>
+ <tag><marker id="system_info_cpu_topology"/>
+ <c>cpu_topology</c></tag>
<item>
<p>Returns the <c><anno>CpuTopology</anno></c> currently used by
the emulator. The CPU topology is used when binding schedulers
@@ -7727,31 +7877,89 @@ ok
<seealso marker="#system_info_cpu_topology">
<c>cpu_topology</c></seealso>.</p>
</item>
+ <tag><marker id="system_info_logical_processors"/>
+ <c>logical_processors</c></tag>
+ <item>
+ <p>Returns the detected number of logical processors configured
+ in the system. The return value is either an integer, or
+ the atom <c>unknown</c> if the emulator cannot
+ detect the configured logical processors.</p>
+ </item>
+ <tag><marker id="system_info_logical_processors_available"/>
+ <c>logical_processors_available</c></tag>
+ <item>
+ <p>Returns the detected number of logical processors available
+ to the Erlang runtime system. The return value is either an
+ integer, or the atom <c>unknown</c> if the emulator
+ cannot detect the available logical processors. The number
+ of available logical processors is less than or equal to
+ the number of <seealso marker="#system_info_logical_processors_online">
+ logical processors online</seealso>.</p>
+ </item>
+ <tag><marker id="system_info_logical_processors_online"/>
+ <c>logical_processors_online</c></tag>
+ <item>
+ <p>Returns the detected number of logical processors online on
+ the system. The return value is either an integer,
+ or the atom <c>unknown</c> if the emulator cannot
+ detect logical processors online. The number of logical
+ processors online is less than or equal to the number of
+ <seealso marker="#system_info_logical_processors">logical processors
+ configured</seealso>.</p>
+ </item>
+ <tag><marker id="system_info_update_cpu_info"/>
+ <c>update_cpu_info</c></tag>
+ <item>
+ <p>The runtime system rereads the CPU information available
+ and updates its internally stored information about the
+ <seealso marker="#system_info_cpu_topology_detected">detected
+ CPU topology</seealso> and the number of logical processors
+ <seealso marker="#system_info_logical_processors">configured</seealso>,
+ <seealso marker="#system_info_logical_processors_online">online</seealso>,
+ and <seealso marker="#system_info_logical_processors_available">
+ available</seealso>.</p>
+ <p>If the CPU information has changed since the last time
+ it was read, the atom <c>changed</c> is returned, otherwise
+ the atom <c>unchanged</c>. If the CPU information has changed,
+ you probably want to
+ <seealso marker="#system_flag_schedulers_online">adjust the
+ number of schedulers online</seealso>. You typically want
+ to have as many schedulers online as
+ <seealso marker="#system_info_logical_processors_available">logical
+ processors available</seealso>.</p>
+ </item>
</taglist>
</desc>
</func>
<func>
- <name name="system_info" arity="1" clause_i="29"/>
- <name name="system_info" arity="1" clause_i="30"/>
- <name name="system_info" arity="1" clause_i="38"/>
- <name name="system_info" arity="1" clause_i="39"/>
- <name name="system_info" arity="1" clause_i="40"/>
- <name name="system_info" arity="1" clause_i="41"/>
+ <name name="system_info" arity="1" clause_i="30"
+ anchor="system_info_process"/> <!-- fullsweep_after -->
+ <name name="system_info" arity="1" clause_i="31"/> <!-- garbage_collection -->
+ <name name="system_info" arity="1" clause_i="32"/> <!-- heap_sizes -->
+ <name name="system_info" arity="1" clause_i="33"/> <!-- heap_type -->
+ <name name="system_info" arity="1" clause_i="39"/> <!-- max_heap_size -->
+ <name name="system_info" arity="1" clause_i="40"/> <!-- message_queue_data -->
+ <name name="system_info" arity="1" clause_i="41"/> <!-- min_heap_size -->
+ <name name="system_info" arity="1" clause_i="42"/> <!-- min_bin_vheap_size -->
+ <name name="system_info" arity="1" clause_i="56"/> <!-- procs -->
<fsummary>Information about the default process heap settings.</fsummary>
<type name="message_queue_data"/>
<type name="max_heap_size"/>
<desc>
+ <marker id="system_info_process_tags"/>
<p>Returns information about the default process heap settings:</p>
<taglist>
- <tag><c>fullsweep_after</c></tag>
+ <tag><marker id="system_info_fullsweep_after"/>
+ <c>fullsweep_after</c></tag>
<item>
<p>Returns <c>{fullsweep_after, integer() >= 0}</c>, which is
the <c>fullsweep_after</c> garbage collection setting used
by default. For more information, see
<c>garbage_collection</c> described below.</p>
</item>
- <tag><c>garbage_collection</c></tag>
+ <tag><marker id="system_info_garbage_collection"/>
+ <c>garbage_collection</c></tag>
<item>
<p>Returns a list describing the default garbage collection
settings. A process spawned on the local node by a
@@ -7764,7 +7972,30 @@ ok
can spawn a process that does not use the default
settings.</p>
</item>
- <tag><c>max_heap_size</c></tag>
+ <tag><marker id="system_info_heap_sizes"/>
+ <c>heap_sizes</c></tag>
+ <item>
+ <p>Returns a list of integers representing valid heap sizes
+ in words. All Erlang heaps are sized from sizes in this
+ list.</p>
+ </item>
+ <tag><marker id="system_info_heap_type"/>
+ <c>heap_type</c></tag>
+ <item>
+ <p>Returns the heap type used by the current emulator. One
+ heap type exists:</p>
+ <taglist>
+ <tag><c>private</c></tag>
+ <item>
+ Each process has a heap reserved for its use and no
+ references between heaps of different processes are
+ allowed. Messages passed between processes are copied
+ between heaps.
+ </item>
+ </taglist>
+ </item>
+ <tag><marker id="system_info_max_heap_size"/>
+ <c>max_heap_size</c></tag>
<item>
<p>Returns <c>{max_heap_size, <anno>MaxHeapSize</anno>}</c>,
where <c><anno>MaxHeapSize</anno></c> is the current
@@ -7792,173 +8023,364 @@ ok
<seealso marker="#process_flag_message_queue_data">
<c>process_flag(message_queue_data, MQD)</c></seealso>.</p>
</item>
- <tag><c>min_heap_size</c></tag>
+ <tag><marker id="system_info_min_heap_size"/>
+ <c>min_heap_size</c></tag>
<item>
<p>Returns <c>{min_heap_size, <anno>MinHeapSize</anno>}</c>,
where <c><anno>MinHeapSize</anno></c> is the current
system-wide minimum heap size for spawned processes.</p>
</item>
- <tag><c>min_bin_vheap_size</c></tag>
+ <tag><marker id="system_info_min_bin_vheap_size"/>
+ <c>min_bin_vheap_size</c></tag>
<item>
<p>Returns <c>{min_bin_vheap_size,
<anno>MinBinVHeapSize</anno>}</c>, where
<c><anno>MinBinVHeapSize</anno></c> is the current system-wide
minimum binary virtual heap size for spawned processes.</p>
</item>
+ <tag><marker id="system_info_procs"/>
+ <c>procs</c></tag>
+ <item>
+ <p>Returns a binary containing a string of process and port
+ information formatted as in Erlang crash dumps. For more
+ information, see section <seealso marker="erts:crash_dump">
+ How to interpret the Erlang crash dumps</seealso>
+ in the User's Guide.</p>
+ </item>
</taglist>
</desc>
</func>
<func>
- <name name="system_info" arity="1" clause_i="6"/>
- <name name="system_info" arity="1" clause_i="7"/>
- <name name="system_info" arity="1" clause_i="8"/>
- <name name="system_info" arity="1" clause_i="9"/>
- <name name="system_info" arity="1" clause_i="10"/>
- <name name="system_info" arity="1" clause_i="11"/>
- <name name="system_info" arity="1" clause_i="14"/>
- <name name="system_info" arity="1" clause_i="15"/>
- <name name="system_info" arity="1" clause_i="16"/>
- <name name="system_info" arity="1" clause_i="17"/>
- <name name="system_info" arity="1" clause_i="18"/>
- <name name="system_info" arity="1" clause_i="19"/>
- <name name="system_info" arity="1" clause_i="20"/>
- <name name="system_info" arity="1" clause_i="21"/>
- <name name="system_info" arity="1" clause_i="22"/>
- <name name="system_info" arity="1" clause_i="23"/>
- <name name="system_info" arity="1" clause_i="24"/>
- <name name="system_info" arity="1" clause_i="25"/>
- <name name="system_info" arity="1" clause_i="26"/>
- <name name="system_info" arity="1" clause_i="27"/>
- <name name="system_info" arity="1" clause_i="28"/>
- <name name="system_info" arity="1" clause_i="31"/>
- <name name="system_info" arity="1" clause_i="32"/>
- <name name="system_info" arity="1" clause_i="33"/>
- <name name="system_info" arity="1" clause_i="34"/>
- <name name="system_info" arity="1" clause_i="35"/>
- <name name="system_info" arity="1" clause_i="36"/>
- <name name="system_info" arity="1" clause_i="37"/>
- <name name="system_info" arity="1" clause_i="42"/>
- <name name="system_info" arity="1" clause_i="43"/>
- <name name="system_info" arity="1" clause_i="44"/>
- <name name="system_info" arity="1" clause_i="45"/>
- <name name="system_info" arity="1" clause_i="46"/>
- <name name="system_info" arity="1" clause_i="47"/>
- <name name="system_info" arity="1" clause_i="48"/>
- <name name="system_info" arity="1" clause_i="49"/>
- <name name="system_info" arity="1" clause_i="50"/>
- <name name="system_info" arity="1" clause_i="51"/>
- <name name="system_info" arity="1" clause_i="52"/>
- <name name="system_info" arity="1" clause_i="53"/>
- <name name="system_info" arity="1" clause_i="54"/>
- <name name="system_info" arity="1" clause_i="55"/>
- <name name="system_info" arity="1" clause_i="56"/>
- <name name="system_info" arity="1" clause_i="57"/>
- <name name="system_info" arity="1" clause_i="58"/>
- <name name="system_info" arity="1" clause_i="59"/>
- <name name="system_info" arity="1" clause_i="60"/>
- <name name="system_info" arity="1" clause_i="61"/>
- <name name="system_info" arity="1" clause_i="62"/>
- <name name="system_info" arity="1" clause_i="63"/>
- <name name="system_info" arity="1" clause_i="64"/>
- <name name="system_info" arity="1" clause_i="65"/>
- <name name="system_info" arity="1" clause_i="66"/>
- <name name="system_info" arity="1" clause_i="67"/>
- <name name="system_info" arity="1" clause_i="68"/>
- <name name="system_info" arity="1" clause_i="69"/>
- <name name="system_info" arity="1" clause_i="70"/>
- <name name="system_info" arity="1" clause_i="71"/>
- <fsummary>Information about the system.</fsummary>
+ <name name="system_info" arity="1" clause_i="6"
+ anchor="system_info_limits"/> <!-- atom_count -->
+ <name name="system_info" arity="1" clause_i="7"/> <!-- atom_limit -->
+ <name name="system_info" arity="1" clause_i="29"/> <!-- ets_limit -->
+ <name name="system_info" arity="1" clause_i="52"/> <!-- port_count -->
+ <name name="system_info" arity="1" clause_i="53"/> <!-- port_limit -->
+ <name name="system_info" arity="1" clause_i="54"/> <!-- process_count -->
+ <name name="system_info" arity="1" clause_i="55"/> <!-- process_limit -->
+ <fsummary>Information about various system limits.</fsummary>
<desc>
- <p>Returns various information about the current system
- (emulator) as specified by <c><anno>Item</anno></c>:</p>
+ <marker id="system_info_limits"/>
+ <p>Returns information about the current system
+ (emulator) limits as specified by <c><anno>Item</anno></c>:</p>
<taglist>
- <tag><c>atom_count</c></tag>
+ <tag><marker id="system_info_atom_count"/>
+ <c>atom_count</c></tag>
<item>
- <marker id="system_info_atom_count"></marker>
<p>Returns the number of atoms currently existing at the
- local node. The value is given as an integer.</p>
+ local node. The value is given as an integer.</p>
</item>
- <tag><c>atom_limit</c></tag>
+ <tag><marker id="system_info_atom_limit"/>
+ <c>atom_limit</c></tag>
<item>
- <marker id="system_info_atom_limit"></marker>
<p>Returns the maximum number of atoms allowed.
- This limit can be increased at startup by passing
- command-line flag
- <seealso marker="erts:erl#+t"><c>+t</c></seealso> to
- <c>erl(1)</c>.
+ This limit can be increased at startup by passing
+ command-line flag
+ <seealso marker="erts:erl#+t"><c>+t</c></seealso> to
+ <c>erl(1)</c>.
</p>
</item>
- <tag><c>build_type</c></tag>
+ <tag><marker id="system_info_ets_limit"/>
+ <c>ets_limit</c></tag>
<item>
- <p>Returns an atom describing the build type of the runtime
- system. This is normally the atom <c>opt</c> for optimized.
- Other possible return values are <c>debug</c>, <c>purify</c>,
- <c>quantify</c>, <c>purecov</c>, <c>gcov</c>, <c>valgrind</c>,
- <c>gprof</c>, and <c>lcnt</c>. Possible return values
- can be added or removed at any time without prior notice.</p>
+ <p>Returns the maximum number of ETS tables allowed. This
+ limit can be increased at startup by passing
+ command-line flag
+ <seealso marker="erts:erl#+e"><c>+e</c></seealso> to
+ <c>erl(1)</c> or by setting environment variable
+ <c>ERL_MAX_ETS_TABLES</c> before starting the Erlang
+ runtime system.</p>
</item>
- <tag><c>c_compiler_used</c></tag>
+ <tag><marker id="system_info_port_count"/><c>port_count</c></tag>
<item>
- <p>Returns a two-tuple describing the C compiler used when
- compiling the runtime system. The first element is an
- atom describing the name of the compiler, or <c>undefined</c>
- if unknown. The second element is a term describing the
- version of the compiler, or <c>undefined</c> if unknown.</p>
+ <p>Returns the number of ports currently existing at the
+ local node. The value is given as an integer. This is
+ the same value as returned by
+ <c>length(erlang:ports())</c>, but more efficient.</p>
</item>
- <tag><c>check_io</c></tag>
+ <tag><marker id="system_info_port_limit"/>
+ <c>port_limit</c></tag>
<item>
- <p>Returns a list containing miscellaneous information
- about the emulators internal I/O checking. Notice that
- the content of the returned list can vary between
- platforms and over time. It is only guaranteed
- that a list is returned.</p>
+ <p>Returns the maximum number of simultaneously existing
+ ports at the local node as an integer. This limit can be
+ configured at startup by using command-line flag
+ <seealso marker="erl#+Q"><c>+Q</c></seealso> in <c>erl(1)</c>.</p>
</item>
- <tag><c>compat_rel</c></tag>
+ <tag><marker id="system_info_process_count"/>
+ <c>process_count</c></tag>
<item>
- <p>Returns the compatibility mode of the local node as
- an integer. The integer returned represents the
- Erlang/OTP release that the current emulator has been
- set to be backward compatible with. The compatibility
- mode can be configured at startup by using command-line flag
- <seealso marker="erts:erl#compat_rel"><c>+R</c></seealso> in
- <c>erl(1)</c>.</p>
+ <p>Returns the number of processes currently existing at the
+ local node. The value is given as an integer. This is
+ the same value as returned by
+ <c>length(processes())</c>, but more efficient.</p>
</item>
- <tag><c>cpu_topology</c></tag>
+ <tag><marker id="system_info_process_limit"/>
+ <c>process_limit</c></tag>
<item>
- <p>See <seealso
- marker="#system_info_cpu_topology_tags">above</seealso>.</p>
+ <p>Returns the maximum number of simultaneously existing
+ processes at the local node. The value is given as an
+ integer. This limit can be configured at startup by using
+ command-line flag <seealso marker="erl#+P"><c>+P</c></seealso>
+ in <c>erl(1)</c>.</p>
</item>
- <tag><c>creation</c></tag>
+ </taglist>
+ </desc>
+ </func>
+
+ <func>
+ <name name="system_info" arity="1" clause_i="26"
+ anchor="system_info_time"/> <!-- end_time -->
+ <name name="system_info" arity="1" clause_i="49"/> <!-- os_monotonic_time_source -->
+ <name name="system_info" arity="1" clause_i="50"/> <!-- os_system_time_source -->
+ <name name="system_info" arity="1" clause_i="62"/> <!-- start_time -->
+ <name name="system_info" arity="1" clause_i="67"/> <!-- time_correction -->
+ <name name="system_info" arity="1" clause_i="68"/> <!-- time_offset -->
+ <name name="system_info" arity="1" clause_i="69"/> <!-- time_warp_mode -->
+ <name name="system_info" arity="1" clause_i="70"/> <!-- tolerant_timeofday -->
+ <fsummary>Information about system time.</fsummary>
+ <desc>
+ <marker id="system_info_time_tags"/>
+ <p>Returns information about the current system
+ (emulator) time as specified by <c><anno>Item</anno></c>:</p>
+ <taglist>
+ <tag><marker id="system_info_end_time"/><c>end_time</c></tag>
<item>
- <p>Returns the creation of the local node as an integer.
- The creation is changed when a node is restarted. The
- creation of a node is stored in process identifiers, port
- identifiers, and references. This makes it (to some
- extent) possible to distinguish between identifiers from
- different incarnations of a node. The valid
- creations are integers in the range 1..3, but this will
- probably change in a future release. If the node is not
- alive, <c>0</c> is returned.</p>
+ <p>The last <seealso marker="#monotonic_time/0">Erlang monotonic
+ time</seealso> in <c>native</c>
+ <seealso marker="#type_time_unit">time unit</seealso> that
+ can be represented internally in the current Erlang runtime system
+ instance. The time between the
+ <seealso marker="#system_info_start_time">start time</seealso> and
+ the end time is at least a quarter of a millennium.</p>
</item>
- <tag><c>debug_compiled</c></tag>
+ <tag><marker id="system_info_os_monotonic_time_source"/>
+ <c>os_monotonic_time_source</c></tag>
<item>
- <p>Returns <c>true</c> if the emulator has been
- debug-compiled, otherwise <c>false</c>.</p>
+ <p>Returns a list containing information about the source of
+ <seealso marker="erts:time_correction#OS_Monotonic_Time">OS
+ monotonic time</seealso> that is used by the runtime system.</p>
+ <p>If <c>[]</c> is returned, no OS monotonic time is
+ available. The list contains two-tuples with <c>Key</c>s
+ as first element, and <c>Value</c>s as second element. The
+ order of these tuples is undefined. The following
+ tuples can be part of the list, but more tuples can be
+ introduced in the future:</p>
+ <taglist>
+ <tag><c>{function, Function}</c></tag>
+ <item><p><c>Function</c> is the name of the function
+ used. This tuple always exists if OS monotonic time is
+ available to the runtime system.</p>
+ </item>
+ <tag><c>{clock_id, ClockId}</c></tag>
+ <item><p>This tuple only exists if <c>Function</c>
+ can be used with different clocks. <c>ClockId</c>
+ corresponds to the clock identifier used when calling
+ <c>Function</c>.</p>
+ </item>
+ <tag><c>{resolution, OsMonotonicTimeResolution}</c></tag>
+ <item><p>Highest possible
+ <seealso marker="time_correction#Time_Resolution">
+ resolution</seealso>
+ of current OS monotonic time source as parts per
+ second. If no resolution information can be retrieved
+ from the OS, <c>OsMonotonicTimeResolution</c> is
+ set to the resolution of the time unit of
+ <c>Function</c>s return value. That is, the actual
+ resolution can be lower than
+ <c>OsMonotonicTimeResolution</c>. Notice that
+ the resolution does not say anything about the
+ <seealso marker="time_correction#Time_Accuracy">
+ accuracy</seealso> or whether the
+ <seealso marker="time_correction#Time_Precision">
+ precision</seealso> aligns with the resolution. You do,
+ however, know that the precision is not better than
+ <c>OsMonotonicTimeResolution</c>.</p>
+ </item>
+ <tag><c>{extended, Extended}</c></tag>
+ <item><p><c>Extended</c> equals <c>yes</c> if
+ the range of time values has been extended;
+ otherwise <c>Extended</c> equals <c>no</c>. The
+ range must be extended if <c>Function</c>
+ returns values that wrap fast. This typically
+ is the case when the return value is a 32-bit value.</p>
+ </item>
+ <tag><c>{parallel, Parallel}</c></tag>
+ <item><p><c>Parallel</c> equals <c>yes</c> if
+ <c>Function</c> is called in parallel from multiple
+ threads. If it is not called in parallel, because
+ calls must be serialized, <c>Parallel</c> equals
+ <c>no</c>.</p>
+ </item>
+ <tag><c>{time, OsMonotonicTime}</c></tag>
+ <item><p><c>OsMonotonicTime</c> equals current OS
+ monotonic time in <c>native</c>
+ <seealso marker="#type_time_unit">time unit</seealso>.</p>
+ </item>
+ </taglist>
</item>
- <tag><c>delayed_node_table_gc</c></tag>
+ <tag><marker id="system_info_os_system_time_source"/>
+ <c>os_system_time_source</c></tag>
<item>
- <marker id="system_info_delayed_node_table_gc"></marker>
- <p>Returns the amount of time in seconds garbage collection
- of an entry in a node table is delayed. This limit can be set
- on startup by passing command-line flag
- <seealso marker="erts:erl#+zdntgc"><c>+zdntgc</c></seealso>
- to <c>erl(1)</c>. For more information, see the documentation of
- the command-line flag.</p>
+ <p>Returns a list containing information about the source of
+ <seealso marker="erts:time_correction#OS_System_Time">OS
+ system time</seealso> that is used by the runtime system.</p>
+ <p>The list contains two-tuples with <c>Key</c>s
+ as first element, and <c>Value</c>s as second element. The
+ order if these tuples is undefined. The following
+ tuples can be part of the list, but more tuples can be
+ introduced in the future:</p>
+ <taglist>
+ <tag><c>{function, Function}</c></tag>
+ <item><p><c>Function</c> is the name of the funcion used.</p>
+ </item>
+ <tag><c>{clock_id, ClockId}</c></tag>
+ <item><p>Exists only if <c>Function</c>
+ can be used with different clocks. <c>ClockId</c>
+ corresponds to the clock identifier used when calling
+ <c>Function</c>.</p>
+ </item>
+ <tag><c>{resolution, OsSystemTimeResolution}</c></tag>
+ <item><p>Highest possible
+ <seealso marker="time_correction#Time_Resolution">
+ resolution</seealso>
+ of current OS system time source as parts per
+ second. If no resolution information can be retrieved
+ from the OS, <c>OsSystemTimeResolution</c> is
+ set to the resolution of the time unit of
+ <c>Function</c>s return value. That is, the actual
+ resolution can be lower than
+ <c>OsSystemTimeResolution</c>. Notice that
+ the resolution does not say anything about the
+ <seealso marker="time_correction#Time_Accuracy">
+ accuracy</seealso> or whether the
+ <seealso marker="time_correction#Time_Precision">
+ precision</seealso> do align with the resolution. You do,
+ however, know that the precision is not better than
+ <c>OsSystemTimeResolution</c>.</p>
+ </item>
+ <tag><c>{parallel, Parallel}</c></tag>
+ <item><p><c>Parallel</c> equals <c>yes</c> if
+ <c>Function</c> is called in parallel from multiple
+ threads. If it is not called in parallel, because
+ calls needs to be serialized, <c>Parallel</c> equals
+ <c>no</c>.</p>
+ </item>
+ <tag><c>{time, OsSystemTime}</c></tag>
+ <item><p><c>OsSystemTime</c> equals current OS
+ system time in <c>native</c>
+ <seealso marker="#type_time_unit">time unit</seealso>.</p>
+ </item>
+ </taglist>
+ </item>
+ <tag><marker id="system_info_start_time"/><c>start_time</c></tag>
+ <item>
+ <p>The <seealso marker="#monotonic_time/0">Erlang monotonic
+ time</seealso> in <c>native</c>
+ <seealso marker="#type_time_unit">time unit</seealso> at the
+ time when current Erlang runtime system instance started.</p>
+ <p>See also <seealso marker="#system_info_end_time">
+ <c>erlang:system_info(end_time)</c></seealso>.</p>
+ </item>
+ <tag><marker id="system_info_time_correction"/>
+ <c>time_correction</c></tag>
+ <item>
+ <p>Returns a boolean value indicating whether
+ <seealso marker="time_correction#Time_Correction">
+ time correction</seealso> is enabled or not.</p>
+ </item>
+ <tag><marker id="system_info_time_offset"/>
+ <c>time_offset</c></tag>
+ <item>
+ <p>Returns the state of the time offset:</p>
+ <taglist>
+ <tag><c>preliminary</c></tag>
+ <item>
+ <p>The time offset is preliminary, and will be changed
+ and finalized later. The preliminary time offset
+ is used during the preliminary phase of the
+ <seealso marker="time_correction#Single_Time_Warp_Mode">
+ single time warp mode</seealso>.</p>
+ </item>
+ <tag><c>final</c></tag>
+ <item>
+ <p>The time offset is final. This either because
+ <seealso marker="time_correction#No_Time_Warp_Mode">
+ no time warp mode</seealso> is used, or because the time
+ offset have been finalized when
+ <seealso marker="time_correction#Single_Time_Warp_Mode">
+ single time warp mode</seealso> is used.</p>
+ </item>
+ <tag><c>volatile</c></tag>
+ <item>
+ <p>The time offset is volatile. That is, it can
+ change at any time. This is because
+ <seealso marker="time_correction#Multi_Time_Warp_Mode">
+ multi-time warp mode</seealso> is used.</p>
+ </item>
+ </taglist>
+ </item>
+ <tag><marker id="system_info_time_warp_mode"/>
+ <c>time_warp_mode</c></tag>
+ <item>
+ <p>Returns a value identifying the
+ <seealso marker="time_correction#Time_Warp_Modes">
+ time warp mode</seealso> that is used:</p>
+ <taglist>
+ <tag><c>no_time_warp</c></tag>
+ <item>The <seealso marker="time_correction#No_Time_Warp_Mode">
+ no time warp mode</seealso> is used.
+ </item>
+ <tag><c>single_time_warp</c></tag>
+ <item>The <seealso marker="time_correction#Single_Time_Warp_Mode">
+ single time warp mode</seealso> is used.
+ </item>
+ <tag><c>multi_time_warp</c></tag>
+ <item>The <seealso marker="time_correction#Multi_Time_Warp_Mode">
+ multi-time warp mode</seealso> is used.
+ </item>
+ </taglist>
</item>
- <tag><c>dirty_cpu_schedulers</c></tag>
+ <tag><marker id="system_info_tolerant_timeofday"/>
+ <c>tolerant_timeofday</c></tag>
+ <item>
+ <p>Returns whether a pre ERTS 7.0 backwards compatible
+ compensation for sudden changes of system time is <c>enabled</c>
+ or <c>disabled</c>. Such compensation is <c>enabled</c> when the
+ <seealso marker="#system_info_time_offset">time offset</seealso>
+ is <c>final</c>, and
+ <seealso marker="#system_info_time_correction">
+ time correction</seealso> is enabled.</p>
+ </item>
+ </taglist>
+ </desc>
+ </func>
+
+ <func>
+ <name name="system_info" arity="1" clause_i="17"
+ anchor="system_info_scheduler"/> <!-- dirty_cpu_schedulers -->
+ <name name="system_info" arity="1" clause_i="18"/> <!-- dirty_cpu_schedulers_online -->
+ <name name="system_info" arity="1" clause_i="19"/> <!-- dirty_io_schedulers -->
+ <name name="system_info" arity="1" clause_i="44"/> <!-- multi_scheduling -->
+ <name name="system_info" arity="1" clause_i="45"/> <!-- multi_scheduling_blockers -->
+ <name name="system_info" arity="1" clause_i="47"/> <!-- normal_multi_scheduling_blockers -->
+ <name name="system_info" arity="1" clause_i="57"/> <!-- scheduler_bind_type -->
+ <name name="system_info" arity="1" clause_i="58"/> <!-- scheduler_bindings -->
+ <name name="system_info" arity="1" clause_i="59"/> <!-- scheduler_id -->
+ <name name="system_info" arity="1" clause_i="60"/> <!-- schedulers -->
+ <name name="system_info" arity="1" clause_i="61"/> <!-- smp_support -->
+ <name name="system_info" arity="1" clause_i="65"/> <!-- threads -->
+ <name name="system_info" arity="1" clause_i="66"/> <!-- thread_pool_size -->
+ <fsummary>Information about system schedulers.</fsummary>
+ <desc>
+ <marker id="system_info_scheduler_tags"/>
+ <p>Returns information about schedulers, scheduling and threads in the
+ current system as specified by <c><anno>Item</anno></c>:</p>
+ <taglist>
+ <tag><marker id="system_info_dirty_cpu_schedulers"/>
+ <c>dirty_cpu_schedulers</c></tag>
<item>
- <marker id="system_info_dirty_cpu_schedulers"></marker>
<p>Returns the number of dirty CPU scheduler threads used by
the emulator. Dirty CPU schedulers execute CPU-bound
native functions, such as NIFs, linked-in driver code,
@@ -7989,9 +8411,9 @@ ok
<c>erlang:system_flag(schedulers_online,
SchedulersOnline)</c></seealso>.</p>
</item>
- <tag><c>dirty_cpu_schedulers_online</c></tag>
+ <tag><marker id="system_info_dirty_cpu_schedulers_online"/>
+ <c>dirty_cpu_schedulers_online</c></tag>
<item>
- <marker id="system_info_dirty_cpu_schedulers_online"></marker>
<p>Returns the number of dirty CPU schedulers online.
The return value satisfies
<c><![CDATA[1 <= DirtyCPUSchedulersOnline <= N]]></c>,
@@ -8013,9 +8435,9 @@ ok
<c>erlang:system_flag(dirty_cpu_schedulers_online,
DirtyCPUSchedulersOnline)</c></seealso>.</p>
</item>
- <tag><c>dirty_io_schedulers</c></tag>
+ <tag><marker id="system_info_dirty_io_schedulers"/>
+ <c>dirty_io_schedulers</c></tag>
<item>
- <marker id="system_info_dirty_io_schedulers"></marker>
<p>Returns the number of dirty I/O schedulers as an integer.
Dirty I/O schedulers execute I/O-bound native functions,
such as NIFs and linked-in driver code, which cannot be
@@ -8032,179 +8454,9 @@ ok
<c>erlang:system_flag(dirty_cpu_schedulers_online,
DirtyCPUSchedulersOnline)</c></seealso>.</p>
</item>
- <tag><c>dist</c></tag>
- <item>
- <p>Returns a binary containing a string of distribution
- information formatted as in Erlang crash dumps. For more
- information, see section <seealso marker="erts:crash_dump">
- How to interpret the Erlang crash dumps</seealso>
- in the User's Guide.</p>
- </item>
- <tag><c>dist_buf_busy_limit</c></tag>
- <item>
- <marker id="system_info_dist_buf_busy_limit"></marker>
- <p>Returns the value of the distribution buffer busy limit
- in bytes. This limit can be set at startup by passing
- command-line flag
- <seealso marker="erts:erl#+zdbbl"><c>+zdbbl</c></seealso>
- to <c>erl(1)</c>.</p>
- </item>
- <tag><c>dist_ctrl</c></tag>
- <item>
- <p>Returns a list of tuples
- <c>{<anno>Node</anno>, <anno>ControllingEntity</anno>}</c>,
- one entry for each connected remote node.
- <c><anno>Node</anno></c> is the node name
- and <c><anno>ControllingEntity</anno></c> is the port or process
- identifier responsible for the communication to that node.
- More specifically, <c><anno>ControllingEntity</anno></c> for
- nodes connected through TCP/IP (the normal case) is the socket
- used in communication with the specific node.</p>
- </item>
- <tag><c>driver_version</c></tag>
- <item>
- <p>Returns a string containing the Erlang driver version
- used by the runtime system. It has the form
- <seealso marker="erts:erl_driver#version_management">
- "&lt;major ver&gt;.&lt;minor ver&gt;"</seealso>.</p>
- </item>
- <tag><c>dynamic_trace</c></tag>
- <item>
- <p>Returns an atom describing the dynamic trace framework
- compiled into the virtual machine. It can be
- <c>dtrace</c>, <c>systemtap</c>, or <c>none</c>. For a
- commercial or standard build, it is always <c>none</c>.
- The other return values indicate a custom configuration
- (for example, <c>./configure --with-dynamic-trace=dtrace</c>).
- For more information about dynamic tracing, see
- <seealso marker="runtime_tools:dyntrace">
- <c>dyntrace(3)</c></seealso> manual page and the
- <c>README.dtrace</c>/<c>README.systemtap</c> files in the
- Erlang source code top directory.</p>
- </item>
- <tag><c>dynamic_trace_probes</c></tag>
+ <tag><marker id="system_info_multi_scheduling"/>
+ <c>multi_scheduling</c></tag>
<item>
- <p>Returns a <c>boolean()</c> indicating if dynamic trace
- probes (<c>dtrace</c> or <c>systemtap</c>) are built into
- the emulator. This can only be <c>true</c> if the virtual
- machine was built for dynamic tracing (that is,
- <c>system_info(dynamic_trace)</c> returns
- <c>dtrace</c> or <c>systemtap</c>).</p>
- </item>
- <tag><marker id="system_info_end_time"/><c>end_time</c></tag>
- <item>
- <p>The last <seealso marker="#monotonic_time/0">Erlang monotonic
- time</seealso> in <c>native</c>
- <seealso marker="#type_time_unit">time unit</seealso> that
- can be represented internally in the current Erlang runtime system
- instance. The time between the
- <seealso marker="#system_info_start_time">start time</seealso> and
- the end time is at least a quarter of a millennium.</p>
- </item>
- <tag><c>elib_malloc</c></tag>
- <item>
- <p>This option will be removed in a future release.
- The return value will always be <c>false</c>, as the
- <c>elib_malloc</c> allocator has been removed.</p>
- </item>
- <tag><c>ets_limit</c></tag>
- <item>
- <p>Returns the maximum number of ETS tables allowed. This
- limit can be increased at startup by passing
- command-line flag
- <seealso marker="erts:erl#+e"><c>+e</c></seealso> to
- <c>erl(1)</c> or by setting environment variable
- <c>ERL_MAX_ETS_TABLES</c> before starting the Erlang
- runtime system.</p>
- </item>
- <tag><c>heap_sizes</c></tag>
- <item>
- <p>Returns a list of integers representing valid heap sizes
- in words. All Erlang heaps are sized from sizes in this
- list.</p>
- </item>
- <tag><c>heap_type</c></tag>
- <item>
- <p>Returns the heap type used by the current emulator. One
- heap type exists:</p>
- <taglist>
- <tag><c>private</c></tag>
- <item>
- Each process has a heap reserved for its use and no
- references between heaps of different processes are
- allowed. Messages passed between processes are copied
- between heaps.
- </item>
- </taglist>
- </item>
- <tag><c>info</c></tag>
- <item>
- <p>Returns a binary containing a string of miscellaneous
- system information formatted as in Erlang crash dumps.
- For more information, see section
- <seealso marker="erts:crash_dump">
- How to interpret the Erlang crash dumps</seealso>
- in the User's Guide.</p>
- </item>
- <tag><c>kernel_poll</c></tag>
- <item>
- <p>Returns <c>true</c> if the emulator uses some kind of
- kernel-poll implementation, otherwise <c>false</c>.</p>
- </item>
- <tag><c>loaded</c></tag>
- <item>
- <p>Returns a binary containing a string of loaded module
- information formatted as in Erlang crash dumps. For more
- information, see section
- <seealso marker="erts:crash_dump">How to interpret the Erlang
- crash dumps</seealso> in the User's Guide.</p>
- </item>
- <tag><c>logical_processors</c></tag>
- <item>
- <marker id="logical_processors"></marker>
- <p>Returns the detected number of logical processors configured
- in the system. The return value is either an integer, or
- the atom <c>unknown</c> if the emulator cannot
- detect the configured logical processors.</p>
- </item>
- <tag><c>logical_processors_available</c></tag>
- <item>
- <marker id="logical_processors_available"></marker>
- <p>Returns the detected number of logical processors available
- to the Erlang runtime system. The return value is either an
- integer, or the atom <c>unknown</c> if the emulator
- cannot detect the available logical processors. The number
- of available logical processors is less than or equal to
- the number of <seealso marker="#logical_processors_online">
- logical processors online</seealso>.</p>
- </item>
- <tag><c>logical_processors_online</c></tag>
- <item>
- <marker id="logical_processors_online"></marker>
- <p>Returns the detected number of logical processors online on
- the system. The return value is either an integer,
- or the atom <c>unknown</c> if the emulator cannot
- detect logical processors online. The number of logical
- processors online is less than or equal to the number of
- <seealso marker="#logical_processors">logical processors
- configured</seealso>.</p>
- </item>
- <tag><c>machine</c></tag>
- <item>
- <p>Returns a string containing the Erlang machine name.</p>
- </item>
- <tag><c>modified_timing_level</c></tag>
- <item>
- <p>Returns the modified timing-level (an integer) if
- modified timing is enabled, otherwise <c>undefined</c>.
- For more information about modified timing, see
- command-line flag
- <seealso marker="erts:erl#+T"><c>+T</c></seealso>
- in <c>erl(1)</c></p>
- </item>
- <tag><c>multi_scheduling</c></tag>
- <item>
- <marker id="system_info_multi_scheduling"></marker>
<p>Returns one of the following:</p>
<taglist>
<tag><c>disabled</c></tag>
@@ -8244,9 +8496,9 @@ ok
and <seealso marker="#system_info_schedulers">
<c>erlang:system_info(schedulers)</c></seealso>.</p>
</item>
- <tag><c>multi_scheduling_blockers</c></tag>
+ <tag><marker id="system_info_multi_scheduling_blockers"/>
+ <c>multi_scheduling_blockers</c></tag>
<item>
- <marker id="system_info_multi_scheduling_blockers"></marker>
<p>Returns a list of <c><anno>Pid</anno></c>s when
multi-scheduling is blocked, otherwise the empty list is
returned. The <c><anno>Pid</anno></c>s in the list
@@ -8264,15 +8516,9 @@ ok
and <seealso marker="#system_info_schedulers">
<c>erlang:system_info(schedulers)</c></seealso>.</p>
</item>
- <tag><c>nif_version</c></tag>
+ <tag><marker id="system_info_normal_multi_scheduling_blockers"/>
+ <c>normal_multi_scheduling_blockers</c></tag>
<item>
- <p>Returns a string containing the version of the Erlang NIF
- interface used by the runtime system. It is on the form
- "&lt;major ver&gt;.&lt;minor ver&gt;".</p>
- </item>
- <tag><c>normal_multi_scheduling_blockers</c></tag>
- <item>
- <marker id="system_info_normal_multi_scheduling_blockers"></marker>
<p>Returns a list of <c><anno>Pid</anno></c>s when
normal multi-scheduling is blocked (that is, all normal schedulers
but one is blocked), otherwise the empty list is returned.
@@ -8290,192 +8536,9 @@ ok
and <seealso marker="#system_info_schedulers">
<c>erlang:system_info(schedulers)</c></seealso>.</p>
</item>
- <tag><marker id="system_info_otp_release"/>
- <c>otp_release</c></tag>
- <item>
- <marker id="system_info_otp_release"></marker>
- <p>Returns a string containing the OTP release number of the
- OTP release that the currently executing ERTS application
- is part of.</p>
- <p>As from Erlang/OTP 17, the OTP release number corresponds to
- the major OTP version number. No
- <c>erlang:system_info()</c> argument gives the exact OTP
- version. This is because the exact OTP version in the general case
- is difficult to determine. For more information, see the
- description of versions in
- <seealso marker="doc/system_principles:versions">
- System principles</seealso> in System Documentation.</p>
- </item>
- <tag><marker id="system_info_os_monotonic_time_source"/>
- <c>os_monotonic_time_source</c></tag>
+ <tag><marker id="system_info_scheduler_bind_type"/>
+ <c>scheduler_bind_type</c></tag>
<item>
- <p>Returns a list containing information about the source of
- <seealso marker="erts:time_correction#OS_Monotonic_Time">OS
- monotonic time</seealso> that is used by the runtime system.</p>
- <p>If <c>[]</c> is returned, no OS monotonic time is
- available. The list contains two-tuples with <c>Key</c>s
- as first element, and <c>Value</c>s as second element. The
- order of these tuples is undefined. The following
- tuples can be part of the list, but more tuples can be
- introduced in the future:</p>
- <taglist>
- <tag><c>{function, Function}</c></tag>
- <item><p><c>Function</c> is the name of the function
- used. This tuple always exists if OS monotonic time is
- available to the runtime system.</p>
- </item>
- <tag><c>{clock_id, ClockId}</c></tag>
- <item><p>This tuple only exists if <c>Function</c>
- can be used with different clocks. <c>ClockId</c>
- corresponds to the clock identifier used when calling
- <c>Function</c>.</p>
- </item>
- <tag><c>{resolution, OsMonotonicTimeResolution}</c></tag>
- <item><p>Highest possible
- <seealso marker="time_correction#Time_Resolution">
- resolution</seealso>
- of current OS monotonic time source as parts per
- second. If no resolution information can be retrieved
- from the OS, <c>OsMonotonicTimeResolution</c> is
- set to the resolution of the time unit of
- <c>Function</c>s return value. That is, the actual
- resolution can be lower than
- <c>OsMonotonicTimeResolution</c>. Notice that
- the resolution does not say anything about the
- <seealso marker="time_correction#Time_Accuracy">
- accuracy</seealso> or whether the
- <seealso marker="time_correction#Time_Precision">
- precision</seealso> aligns with the resolution. You do,
- however, know that the precision is not better than
- <c>OsMonotonicTimeResolution</c>.</p>
- </item>
- <tag><c>{extended, Extended}</c></tag>
- <item><p><c>Extended</c> equals <c>yes</c> if
- the range of time values has been extended;
- otherwise <c>Extended</c> equals <c>no</c>. The
- range must be extended if <c>Function</c>
- returns values that wrap fast. This typically
- is the case when the return value is a 32-bit value.</p>
- </item>
- <tag><c>{parallel, Parallel}</c></tag>
- <item><p><c>Parallel</c> equals <c>yes</c> if
- <c>Function</c> is called in parallel from multiple
- threads. If it is not called in parallel, because
- calls must be serialized, <c>Parallel</c> equals
- <c>no</c>.</p>
- </item>
- <tag><c>{time, OsMonotonicTime}</c></tag>
- <item><p><c>OsMonotonicTime</c> equals current OS
- monotonic time in <c>native</c>
- <seealso marker="#type_time_unit">time unit</seealso>.</p>
- </item>
- </taglist>
- </item>
- <tag><marker id="system_info_os_system_time_source"/>
- <c>os_system_time_source</c></tag>
- <item>
- <p>Returns a list containing information about the source of
- <seealso marker="erts:time_correction#OS_System_Time">OS
- system time</seealso> that is used by the runtime system.</p>
- <p>The list contains two-tuples with <c>Key</c>s
- as first element, and <c>Value</c>s as second element. The
- order if these tuples is undefined. The following
- tuples can be part of the list, but more tuples can be
- introduced in the future:</p>
- <taglist>
- <tag><c>{function, Function}</c></tag>
- <item><p><c>Function</c> is the name of the funcion used.</p>
- </item>
- <tag><c>{clock_id, ClockId}</c></tag>
- <item><p>Exists only if <c>Function</c>
- can be used with different clocks. <c>ClockId</c>
- corresponds to the clock identifier used when calling
- <c>Function</c>.</p>
- </item>
- <tag><c>{resolution, OsSystemTimeResolution}</c></tag>
- <item><p>Highest possible
- <seealso marker="time_correction#Time_Resolution">
- resolution</seealso>
- of current OS system time source as parts per
- second. If no resolution information can be retrieved
- from the OS, <c>OsSystemTimeResolution</c> is
- set to the resolution of the time unit of
- <c>Function</c>s return value. That is, the actual
- resolution can be lower than
- <c>OsSystemTimeResolution</c>. Notice that
- the resolution does not say anything about the
- <seealso marker="time_correction#Time_Accuracy">
- accuracy</seealso> or whether the
- <seealso marker="time_correction#Time_Precision">
- precision</seealso> do align with the resolution. You do,
- however, know that the precision is not better than
- <c>OsSystemTimeResolution</c>.</p>
- </item>
- <tag><c>{parallel, Parallel}</c></tag>
- <item><p><c>Parallel</c> equals <c>yes</c> if
- <c>Function</c> is called in parallel from multiple
- threads. If it is not called in parallel, because
- calls needs to be serialized, <c>Parallel</c> equals
- <c>no</c>.</p>
- </item>
- <tag><c>{time, OsSystemTime}</c></tag>
- <item><p><c>OsSystemTime</c> equals current OS
- system time in <c>native</c>
- <seealso marker="#type_time_unit">time unit</seealso>.</p>
- </item>
- </taglist>
- </item>
- <tag><c>port_parallelism</c></tag>
- <item>
- <marker id="system_info_port_parallelism"></marker>
- <p>Returns the default port parallelism scheduling hint used.
- For more information, see command-line argument
- <seealso marker="erl#+spp"><c>+spp</c></seealso>
- in <c>erl(1)</c>.</p>
- </item>
- <tag><marker id="system_info_port_count"/><c>port_count</c></tag>
- <item>
- <p>Returns the number of ports currently existing at the
- local node. The value is given as an integer. This is
- the same value as returned by
- <c>length(erlang:ports())</c>, but more efficient.</p>
- </item>
- <tag><c>port_limit</c></tag>
- <item>
- <marker id="system_info_port_limit"></marker>
- <p>Returns the maximum number of simultaneously existing
- ports at the local node as an integer. This limit can be
- configured at startup by using command-line flag
- <seealso marker="erl#+Q"><c>+Q</c></seealso> in <c>erl(1)</c>.</p>
- </item>
- <tag><marker id="system_info_process_count"/>
- <c>process_count</c></tag>
- <item>
- <p>Returns the number of processes currently existing at the
- local node. The value is given as an integer. This is
- the same value as returned by
- <c>length(processes())</c>, but more efficient.</p>
- </item>
- <tag><c>process_limit</c></tag>
- <item>
- <marker id="system_info_process_limit"></marker>
- <p>Returns the maximum number of simultaneously existing
- processes at the local node. The value is given as an
- integer. This limit can be configured at startup by using
- command-line flag <seealso marker="erl#+P"><c>+P</c></seealso>
- in <c>erl(1)</c>.</p>
- </item>
- <tag><c>procs</c></tag>
- <item>
- <p>Returns a binary containing a string of process and port
- information formatted as in Erlang crash dumps. For more
- information, see section <seealso marker="erts:crash_dump">
- How to interpret the Erlang crash dumps</seealso>
- in the User's Guide.</p>
- </item>
- <tag><c>scheduler_bind_type</c></tag>
- <item>
- <marker id="system_info_scheduler_bind_type"></marker>
<p>Returns information about how the user has requested
schedulers to be bound or not bound.</p>
<p>Notice that although a user has requested
@@ -8489,9 +8552,9 @@ ok
<seealso marker="#system_info_scheduler_bindings">
<c>erlang:system_info(scheduler_bindings)</c></seealso>.</p>
</item>
- <tag><c>scheduler_bindings</c></tag>
+ <tag><marker id="system_info_scheduler_bindings"/>
+ <c>scheduler_bindings</c></tag>
<item>
- <marker id="system_info_scheduler_bindings"></marker>
<p>Returns information about the currently used scheduler
bindings.</p>
<p>A tuple of a size equal to
@@ -8515,9 +8578,9 @@ ok
<seealso marker="#system_info_schedulers_online">
<c>erlang:system_info(schedulers_online)</c></seealso>.</p>
</item>
- <tag><c>scheduler_id</c></tag>
+ <tag><marker id="system_info_scheduler_id"/>
+ <c>scheduler_id</c></tag>
<item>
- <marker id="system_info_scheduler_id"></marker>
<p>Returns the scheduler ID (<c>SchedulerId</c>) of the
scheduler thread that the calling process is executing
on. <c><anno>SchedulerId</anno></c> is a positive integer,
@@ -8527,9 +8590,9 @@ ok
<seealso marker="#system_info_schedulers">
<c>erlang:system_info(schedulers)</c></seealso>.</p>
</item>
- <tag><c>schedulers</c></tag>
+ <tag><marker id="system_info_schedulers"/>
+ <c>schedulers</c></tag>
<item>
- <marker id="system_info_schedulers"></marker>
<p>Returns the number of scheduler threads used by
the emulator. Scheduler threads online schedules Erlang
processes and Erlang ports, and execute Erlang code
@@ -8556,9 +8619,9 @@ ok
<c>erlang:system_info(multi_scheduling_blockers)</c></seealso>.
</p>
</item>
- <tag><c>schedulers_online</c></tag>
+ <tag><marker id="system_info_schedulers_online"/>
+ <c>schedulers_online</c></tag>
<item>
- <marker id="system_info_schedulers_online"></marker>
<p>Returns the number of schedulers online. The scheduler
identifiers of schedulers online satisfy the relationship
<c><![CDATA[1 <= SchedulerId <=
@@ -8570,34 +8633,18 @@ ok
<c>erlang:system_flag(schedulers_online,
SchedulersOnline)</c></seealso>.</p>
</item>
- <tag><c>smp_support</c></tag>
+ <tag><marker id="system_info_smp_support"/>
+ <c>smp_support</c></tag>
<item>
<p>Returns <c>true</c>.</p>
</item>
- <tag><marker id="system_info_start_time"/><c>start_time</c></tag>
- <item>
- <p>The <seealso marker="#monotonic_time/0">Erlang monotonic
- time</seealso> in <c>native</c>
- <seealso marker="#type_time_unit">time unit</seealso> at the
- time when current Erlang runtime system instance started.</p>
- <p>See also <seealso marker="#system_info_end_time">
- <c>erlang:system_info(end_time)</c></seealso>.</p>
- </item>
- <tag><c>system_version</c></tag>
- <item>
- <p>Returns a string containing version number and
- some important properties, such as the number of schedulers.</p>
- </item>
- <tag><c>system_architecture</c></tag>
- <item>
- <p>Returns a string containing the processor and OS
- architecture the emulator is built for.</p>
- </item>
- <tag><c>threads</c></tag>
+ <tag><marker id="system_info_threads"/>
+ <c>threads</c></tag>
<item>
<p>Returns <c>true</c>.</p>
</item>
- <tag><c>thread_pool_size</c></tag>
+ <tag><marker id="system_info_thread_pool_size"/>
+ <c>thread_pool_size</c></tag>
<item>
<marker id="system_info_thread_pool_size"></marker>
<p>Returns the number of async threads in the async thread
@@ -8606,111 +8653,341 @@ ok
<c>erl_driver:driver_async()</c></seealso>).
The value is given as an integer.</p>
</item>
- <tag><c>time_correction</c></tag>
+ </taglist>
+ </desc>
+ </func>
+
+ <func>
+ <name name="system_info" arity="1" clause_i="14"
+ anchor="system_info_dist"/> <!-- creation -->
+ <name name="system_info" arity="1" clause_i="16"/> <!-- delayed_node_table_gc -->
+ <name name="system_info" arity="1" clause_i="20"/> <!-- dist -->
+ <name name="system_info" arity="1" clause_i="21"/> <!-- dist_buf_busy_limit -->
+ <name name="system_info" arity="1" clause_i="22"/> <!-- dist_ctrl -->
+ <fsummary>Information about erlang distribution.</fsummary>
+ <desc>
+ <marker id="system_info_dist_tags"/>
+ <p>Returns information about Erlang Distribution in the
+ current system as specified by <c><anno>Item</anno></c>:</p>
+ <taglist>
+ <tag><marker id="system_info_creation"/>
+ <c>creation</c></tag>
<item>
- <marker id="system_info_time_correction"></marker>
- <p>Returns a boolean value indicating whether
- <seealso marker="time_correction#Time_Correction">
- time correction</seealso> is enabled or not.</p>
+ <p>Returns the creation of the local node as an integer.
+ The creation is changed when a node is restarted. The
+ creation of a node is stored in process identifiers, port
+ identifiers, and references. This makes it (to some
+ extent) possible to distinguish between identifiers from
+ different incarnations of a node. The valid
+ creations are integers in the range 1..3, but this will
+ probably change in a future release. If the node is not
+ alive, <c>0</c> is returned.</p>
</item>
- <tag><c>time_offset</c></tag>
+ <tag><marker id="system_info_delayed_node_table_gc"/>
+ <c>delayed_node_table_gc</c></tag>
<item>
- <marker id="system_info_time_offset"></marker>
- <p>Returns the state of the time offset:</p>
- <taglist>
- <tag><c>preliminary</c></tag>
- <item>
- <p>The time offset is preliminary, and will be changed
- and finalized later. The preliminary time offset
- is used during the preliminary phase of the
- <seealso marker="time_correction#Single_Time_Warp_Mode">
- single time warp mode</seealso>.</p>
- </item>
- <tag><c>final</c></tag>
- <item>
- <p>The time offset is final. This either because
- <seealso marker="time_correction#No_Time_Warp_Mode">
- no time warp mode</seealso> is used, or because the time
- offset have been finalized when
- <seealso marker="time_correction#Single_Time_Warp_Mode">
- single time warp mode</seealso> is used.</p>
- </item>
- <tag><c>volatile</c></tag>
- <item>
- <p>The time offset is volatile. That is, it can
- change at any time. This is because
- <seealso marker="time_correction#Multi_Time_Warp_Mode">
- multi-time warp mode</seealso> is used.</p>
- </item>
- </taglist>
+ <p>Returns the amount of time in seconds garbage collection
+ of an entry in a node table is delayed. This limit can be set
+ on startup by passing command-line flag
+ <seealso marker="erts:erl#+zdntgc"><c>+zdntgc</c></seealso>
+ to <c>erl(1)</c>. For more information, see the documentation of
+ the command-line flag.</p>
</item>
- <tag><marker id="system_info_time_warp_mode"/>
- <c>time_warp_mode</c></tag>
+ <tag><marker id="system_info_dist"/>
+ <c>dist</c></tag>
<item>
- <p>Returns a value identifying the
- <seealso marker="time_correction#Time_Warp_Modes">
- time warp mode</seealso> that is used:</p>
- <taglist>
- <tag><c>no_time_warp</c></tag>
- <item>The <seealso marker="time_correction#No_Time_Warp_Mode">
- no time warp mode</seealso> is used.
- </item>
- <tag><c>single_time_warp</c></tag>
- <item>The <seealso marker="time_correction#Single_Time_Warp_Mode">
- single time warp mode</seealso> is used.
- </item>
- <tag><c>multi_time_warp</c></tag>
- <item>The <seealso marker="time_correction#Multi_Time_Warp_Mode">
- multi-time warp mode</seealso> is used.
- </item>
- </taglist>
+ <p>Returns a binary containing a string of distribution
+ information formatted as in Erlang crash dumps. For more
+ information, see section <seealso marker="erts:crash_dump">
+ How to interpret the Erlang crash dumps</seealso>
+ in the User's Guide.</p>
</item>
- <tag><c>tolerant_timeofday</c></tag>
+ <tag><marker id="system_info_dist_buf_busy_limit"/>
+ <c>dist_buf_busy_limit</c></tag>
<item>
- <marker id="system_info_tolerant_timeofday"></marker>
- <p>Returns whether a pre ERTS 7.0 backwards compatible
- compensation for sudden changes of system time is <c>enabled</c>
- or <c>disabled</c>. Such compensation is <c>enabled</c> when the
- <seealso marker="#system_info_time_offset">time offset</seealso>
- is <c>final</c>, and
- <seealso marker="#system_info_time_correction">
- time correction</seealso> is enabled.</p>
+ <p>Returns the value of the distribution buffer busy limit
+ in bytes. This limit can be set at startup by passing
+ command-line flag
+ <seealso marker="erts:erl#+zdbbl"><c>+zdbbl</c></seealso>
+ to <c>erl(1)</c>.</p>
+ </item>
+ <tag><marker id="system_info_dist_ctrl"/>
+ <c>dist_ctrl</c></tag>
+ <item>
+ <p>Returns a list of tuples
+ <c>{<anno>Node</anno>, <anno>ControllingEntity</anno>}</c>,
+ one entry for each connected remote node.
+ <c><anno>Node</anno></c> is the node name
+ and <c><anno>ControllingEntity</anno></c> is the port or process
+ identifier responsible for the communication to that node.
+ More specifically, <c><anno>ControllingEntity</anno></c> for
+ nodes connected through TCP/IP (the normal case) is the socket
+ used in communication with the specific node.</p>
+ </item>
+ </taglist>
+ </desc>
+ </func>
+
+ <func>
+ <!-- <name name="system_info" arity="1" clause_i="1"/> allocated_areas -->
+ <!-- <name name="system_info" arity="1" clause_i="2"/> allocated -->
+ <!-- <name name="system_info" arity="1" clause_i="3"/> {allocator, _} -->
+ <!-- <name name="system_info" arity="1" clause_i="4"/> alloc_util_allocators -->
+ <!-- <name name="system_info" arity="1" clause_i="5"/> {allocator_sizes, _} -->
+ <!-- <name name="system_info" arity="1" clause_i="6"/> atom_count -->
+ <!-- <name name="system_info" arity="1" clause_i="7"/> atom_limit -->
+ <name name="system_info" arity="1" clause_i="8"
+ anchor="system_info_misc"/> <!-- build_type -->
+ <name name="system_info" arity="1" clause_i="9"/> <!-- c_compiler_used -->
+ <name name="system_info" arity="1" clause_i="10"/> <!-- check_io -->
+ <name name="system_info" arity="1" clause_i="11"/> <!-- compat_rel -->
+ <!-- <name name="system_info" arity="1" clause_i="12"/> cpu_topology -->
+ <!-- <name name="system_info" arity="1" clause_i="13"/> {cpu_topology, _} -->
+ <!-- <name name="system_info" arity="1" clause_i="14"/> creation -->
+ <name name="system_info" arity="1" clause_i="15"/> <!-- debug_compiled -->
+ <!-- <name name="system_info" arity="1" clause_i="16"/> delayed_node_table_gc -->
+ <!-- <name name="system_info" arity="1" clause_i="17"/> dirty_cpu_schedulers -->
+ <!-- <name name="system_info" arity="1" clause_i="18"/> dirty_cpu_schedulers_online -->
+ <!-- <name name="system_info" arity="1" clause_i="19"/> dirty_io_schedulers -->
+ <!-- <name name="system_info" arity="1" clause_i="20"/> dist -->
+ <!-- <name name="system_info" arity="1" clause_i="21"/> dist_buf_busy_limit -->
+ <!-- <name name="system_info" arity="1" clause_i="22"/> dist_ctrl -->
+ <name name="system_info" arity="1" clause_i="23"/> <!-- driver_version -->
+ <name name="system_info" arity="1" clause_i="24"/> <!-- dynamic_trace -->
+ <name name="system_info" arity="1" clause_i="25"/> <!-- dynamic_trace_probes -->
+ <!-- <name name="system_info" arity="1" clause_i="26"/> end_time -->
+ <!-- <name name="system_info" arity="1" clause_i="27"/> elib_malloc -->
+ <!-- <name name="system_info" arity="1" clause_i="28"/> eager_check_io, removed -->
+ <!-- <name name="system_info" arity="1" clause_i="29"/> ets_limit -->
+ <!-- <name name="system_info" arity="1" clause_i="30"/> fullsweep_after -->
+ <!-- <name name="system_info" arity="1" clause_i="31"/> garbage_collection -->
+ <!-- <name name="system_info" arity="1" clause_i="32"/> heap_sizes -->
+ <!-- <name name="system_info" arity="1" clause_i="33"/> heap_type -->
+ <name name="system_info" arity="1" clause_i="34"/> <!-- info -->
+ <name name="system_info" arity="1" clause_i="35"/> <!-- kernel_poll -->
+ <name name="system_info" arity="1" clause_i="36"/> <!-- loaded -->
+ <!-- <name name="system_info" arity="1" clause_i="37"/> logical_processors -->
+ <name name="system_info" arity="1" clause_i="38"/> <!-- machine -->
+ <!-- <name name="system_info" arity="1" clause_i="39"/> max_heap_size -->
+ <!-- <name name="system_info" arity="1" clause_i="40"/> message_queue_data -->
+ <!-- <name name="system_info" arity="1" clause_i="41"/> min_heap_size -->
+ <!-- <name name="system_info" arity="1" clause_i="42"/> min_bin_vheap_size -->
+ <name name="system_info" arity="1" clause_i="43"/> <!-- modified_timing_level -->
+ <!-- <name name="system_info" arity="1" clause_i="44"/> multi_scheduling -->
+ <!-- <name name="system_info" arity="1" clause_i="45"/> multi_scheduling_blockers -->
+ <name name="system_info" arity="1" clause_i="46"/> <!-- nif_version -->
+ <!-- n<name name="system_info" arity="1" clause_i="47"/> ormal_multi_scheduling_blockers -->
+ <name name="system_info" arity="1" clause_i="48"/> <!-- otp_release -->
+ <!-- <name name="system_info" arity="1" clause_i="49"/> os_monotonic_time_source -->
+ <!-- <name name="system_info" arity="1" clause_i="50"/> os_system_time_source -->
+ <name name="system_info" arity="1" clause_i="51"/> <!-- port_parallelism -->
+ <!-- <name name="system_info" arity="1" clause_i="52"/> port_count -->
+ <!-- <name name="system_info" arity="1" clause_i="53"/> port_limit -->
+ <!-- <name name="system_info" arity="1" clause_i="54"/> process_count -->
+ <!-- <name name="system_info" arity="1" clause_i="55"/> process_limit -->
+ <!-- <name name="system_info" arity="1" clause_i="56"/> procs -->
+ <!-- <name name="system_info" arity="1" clause_i="57"/> scheduler_bind_type -->
+ <!-- <name name="system_info" arity="1" clause_i="58"/> scheduler_bindings -->
+ <!-- <name name="system_info" arity="1" clause_i="59"/> scheduler_id -->
+ <!-- <name name="system_info" arity="1" clause_i="60"/> schedulers -->
+ <!-- <name name="system_info" arity="1" clause_i="61"/> smp_support -->
+ <!-- <name name="system_info" arity="1" clause_i="62"/> start_time -->
+ <name name="system_info" arity="1" clause_i="63"/> <!-- system_version -->
+ <name name="system_info" arity="1" clause_i="64"/> <!-- system_architecture -->
+ <!-- <name name="system_info" arity="1" clause_i="65"/> threads -->
+ <!-- <name name="system_info" arity="1" clause_i="66"/> thread_pool_size -->
+ <!-- <name name="system_info" arity="1" clause_i="67"/> time_correction -->
+ <!-- <name name="system_info" arity="1" clause_i="68"/> time_offset -->
+ <!-- <name name="system_info" arity="1" clause_i="69"/> time_warp_mode -->
+ <!-- <name name="system_info" arity="1" clause_i="70"/> tolerant_timeofday -->
+ <name name="system_info" arity="1" clause_i="71"/> <!-- trace_control_word -->
+ <!-- <name name="system_info" arity="1" clause_i="72"/> update_cpu_info -->
+ <name name="system_info" arity="1" clause_i="73"/> <!-- version -->
+ <name name="system_info" arity="1" clause_i="74"/> <!-- wordsize -->
+ <!-- <name name="system_info" arity="1" clause_i="75"/> overview -->
+ <fsummary>Information about the system.</fsummary>
+ <desc>
+ <marker id="system_info_misc_tags"/>
+ <p>Returns various information about the current system
+ (emulator) as specified by <c><anno>Item</anno></c>:</p>
+ <taglist>
+ <tag><marker id="system_info_build_type"/>
+ <c>build_type</c></tag>
+ <item>
+ <p>Returns an atom describing the build type of the runtime
+ system. This is normally the atom <c>opt</c> for optimized.
+ Other possible return values are <c>debug</c>, <c>purify</c>,
+ <c>quantify</c>, <c>purecov</c>, <c>gcov</c>, <c>valgrind</c>,
+ <c>gprof</c>, and <c>lcnt</c>. Possible return values
+ can be added or removed at any time without prior notice.</p>
+ </item>
+ <tag><marker id="system_info_c_compiler_used"/>
+ <c>c_compiler_used</c></tag>
+ <item>
+ <p>Returns a two-tuple describing the C compiler used when
+ compiling the runtime system. The first element is an
+ atom describing the name of the compiler, or <c>undefined</c>
+ if unknown. The second element is a term describing the
+ version of the compiler, or <c>undefined</c> if unknown.</p>
</item>
- <tag><c>trace_control_word</c></tag>
+ <tag><marker id="system_info_check_io"/>
+ <c>check_io</c></tag>
+ <item>
+ <p>Returns a list containing miscellaneous information
+ about the emulators internal I/O checking. Notice that
+ the content of the returned list can vary between
+ platforms and over time. It is only guaranteed
+ that a list is returned.</p>
+ </item>
+ <tag><marker id="system_info_compat_rel"/>
+ <c>compat_rel</c></tag>
+ <item>
+ <p>Returns the compatibility mode of the local node as
+ an integer. The integer returned represents the
+ Erlang/OTP release that the current emulator has been
+ set to be backward compatible with. The compatibility
+ mode can be configured at startup by using command-line flag
+ <seealso marker="erts:erl#compat_rel"><c>+R</c></seealso> in
+ <c>erl(1)</c>.</p>
+ </item>
+ <tag><marker id="system_info_debug_compiled"/>
+ <c>debug_compiled</c></tag>
+ <item>
+ <p>Returns <c>true</c> if the emulator has been
+ debug-compiled, otherwise <c>false</c>.</p>
+ </item>
+ <tag><marker id="system_info_driver_version"/>
+ <c>driver_version</c></tag>
+ <item>
+ <p>Returns a string containing the Erlang driver version
+ used by the runtime system. It has the form
+ <seealso marker="erts:erl_driver#version_management">
+ "&lt;major ver&gt;.&lt;minor ver&gt;"</seealso>.</p>
+ </item>
+ <tag><marker id="system_info_dynamic_trace"/>
+ <c>dynamic_trace</c></tag>
+ <item>
+ <p>Returns an atom describing the dynamic trace framework
+ compiled into the virtual machine. It can be
+ <c>dtrace</c>, <c>systemtap</c>, or <c>none</c>. For a
+ commercial or standard build, it is always <c>none</c>.
+ The other return values indicate a custom configuration
+ (for example, <c>./configure --with-dynamic-trace=dtrace</c>).
+ For more information about dynamic tracing, see
+ <seealso marker="runtime_tools:dyntrace">
+ <c>dyntrace(3)</c></seealso> manual page and the
+ <c>README.dtrace</c>/<c>README.systemtap</c> files in the
+ Erlang source code top directory.</p>
+ </item>
+ <tag><marker id="system_info_dynamic_trace_probes"/>
+ <c>dynamic_trace_probes</c></tag>
+ <item>
+ <p>Returns a <c>boolean()</c> indicating if dynamic trace
+ probes (<c>dtrace</c> or <c>systemtap</c>) are built into
+ the emulator. This can only be <c>true</c> if the virtual
+ machine was built for dynamic tracing (that is,
+ <c>system_info(dynamic_trace)</c> returns
+ <c>dtrace</c> or <c>systemtap</c>).</p>
+ </item>
+ <tag><marker id="system_info_info"/>
+ <c>info</c></tag>
+ <item>
+ <p>Returns a binary containing a string of miscellaneous
+ system information formatted as in Erlang crash dumps.
+ For more information, see section
+ <seealso marker="erts:crash_dump">
+ How to interpret the Erlang crash dumps</seealso>
+ in the User's Guide.</p>
+ </item>
+ <tag><marker id="system_info_kernel_poll"/>
+ <c>kernel_poll</c></tag>
+ <item>
+ <p>Returns <c>true</c> if the emulator uses some kind of
+ kernel-poll implementation, otherwise <c>false</c>.</p>
+ </item>
+ <tag><marker id="system_info_loaded"/>
+ <c>loaded</c></tag>
+ <item>
+ <p>Returns a binary containing a string of loaded module
+ information formatted as in Erlang crash dumps. For more
+ information, see section
+ <seealso marker="erts:crash_dump">How to interpret the Erlang
+ crash dumps</seealso> in the User's Guide.</p>
+ </item>
+ <tag><marker id="system_info_machine"/>
+ <c>machine</c></tag>
+ <item>
+ <p>Returns a string containing the Erlang machine name.</p>
+ </item>
+ <tag><marker id="system_info_modified_timing_level"/>
+ <c>modified_timing_level</c></tag>
+ <item>
+ <p>Returns the modified timing-level (an integer) if
+ modified timing is enabled, otherwise <c>undefined</c>.
+ For more information about modified timing, see
+ command-line flag
+ <seealso marker="erts:erl#+T"><c>+T</c></seealso>
+ in <c>erl(1)</c></p>
+ </item>
+ <tag><marker id="system_info_nif_version"/>
+ <c>nif_version</c></tag>
+ <item>
+ <p>Returns a string containing the version of the Erlang NIF
+ interface used by the runtime system. It is on the form
+ "&lt;major ver&gt;.&lt;minor ver&gt;".</p>
+ </item>
+ <tag><marker id="system_info_otp_release"/>
+ <c>otp_release</c></tag>
+ <item>
+ <marker id="system_info_otp_release"></marker>
+ <p>Returns a string containing the OTP release number of the
+ OTP release that the currently executing ERTS application
+ is part of.</p>
+ <p>As from Erlang/OTP 17, the OTP release number corresponds to
+ the major OTP version number. No
+ <c>erlang:system_info()</c> argument gives the exact OTP
+ version. This is because the exact OTP version in the general case
+ is difficult to determine. For more information, see the
+ description of versions in
+ <seealso marker="doc/system_principles:versions">
+ System principles</seealso> in System Documentation.</p>
+ </item>
+ <tag><marker id="system_info_port_parallelism"/>
+ <c>port_parallelism</c></tag>
+ <item>
+ <p>Returns the default port parallelism scheduling hint used.
+ For more information, see command-line argument
+ <seealso marker="erl#+spp"><c>+spp</c></seealso>
+ in <c>erl(1)</c>.</p>
+ </item>
+ <tag><marker id="system_info_system_version"/>
+ <c>system_version</c></tag>
+ <item>
+ <p>Returns a string containing version number and
+ some important properties, such as the number of schedulers.</p>
+ </item>
+ <tag><marker id="system_info_system_architecture"/>
+ <c>system_architecture</c></tag>
+ <item>
+ <p>Returns a string containing the processor and OS
+ architecture the emulator is built for.</p>
+ </item>
+ <tag><marker id="system_info_trace_control_word"/>
+ <c>trace_control_word</c></tag>
<item>
<p>Returns the value of the node trace control word. For
more information, see function <c>get_tcw</c> in section
<seealso marker="erts:match_spec#get_tcw">
Match Specifications in Erlang</seealso> in the User's Guide.</p>
</item>
- <tag><c>update_cpu_info</c></tag>
+ <tag><marker id="system_info_version"/>
+ <c>version</c></tag>
<item>
- <marker id="update_cpu_info"></marker>
- <p>The runtime system rereads the CPU information available
- and updates its internally stored information about the
- <seealso marker="#system_info_cpu_topology_detected">detected
- CPU topology</seealso> and the number of logical processors
- <seealso marker="#logical_processors">configured</seealso>,
- <seealso marker="#logical_processors_online">online</seealso>,
- and <seealso marker="#logical_processors_available">
- available</seealso>.</p>
- <p>If the CPU information has changed since the last time
- it was read, the atom <c>changed</c> is returned, otherwise
- the atom <c>unchanged</c>. If the CPU information has changed,
- you probably want to
- <seealso marker="#system_flag_schedulers_online">adjust the
- number of schedulers online</seealso>. You typically want
- to have as many schedulers online as
- <seealso marker="#logical_processors_available">logical
- processors available</seealso>.</p>
- </item>
- <tag><c>version</c></tag>
- <item>
- <marker id="system_info_version"></marker>
<p>Returns a string containing the version number of the
emulator.</p>
</item>
- <tag><c>wordsize</c></tag>
+ <tag><marker id="system_info_wordsize"/>
+ <c>wordsize</c></tag>
<item>
<p>Same as <c>{wordsize, internal}</c>.</p>
</item>
@@ -8732,13 +9009,6 @@ ok
64-bit architecture, 8 is returned.</p>
</item>
</taglist>
- <note>
- <p>Argument <c>scheduler</c> has changed name to
- <c>scheduler_id</c> to avoid mix up with argument
- <c>schedulers</c>. Argument <c>scheduler</c> was
- introduced in ERTS 5.5 and renamed in
- ERTS 5.5.1.</p>
- </note>
</desc>
</func>
diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml
index 3109da6738..7ef42c2318 100644
--- a/erts/doc/src/notes.xml
+++ b/erts/doc/src/notes.xml
@@ -10964,7 +10964,7 @@
<c>update_cpu_info</c> will make the runtime system
reread and update the internally stored CPU information.
For more information see the documentation of <seealso
- marker="erlang#update_cpu_info">erlang:system_info(update_cpu_info)</seealso>.</p>
+ marker="erlang#system_info_update_cpu_info">erlang:system_info(update_cpu_info)</seealso>.</p>
<p>
The CPU topology is now automatically detected on Windows
systems with less than 33 logical processors. The runtime
diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl
index d352e11751..370ecdc3f6 100644
--- a/erts/preloaded/src/erlang.erl
+++ b/erts/preloaded/src/erlang.erl
@@ -2563,10 +2563,10 @@ tuple_to_list(_Tuple) ->
Settings :: [{Subsystem :: atom(),
[{Parameter :: atom(),
Value :: term()}]}];
- (alloc_util_allocators) -> [Alloc] when
- Alloc :: atom();
({allocator, Alloc}) -> [_] when %% More or less anything
Alloc :: atom();
+ (alloc_util_allocators) -> [Alloc] when
+ Alloc :: atom();
({allocator_sizes, Alloc}) -> [_] when %% More or less anything
Alloc :: atom();
(atom_count) -> pos_integer();
@@ -2593,6 +2593,7 @@ tuple_to_list(_Tuple) ->
(driver_version) -> string();
(dynamic_trace) -> none | dtrace | systemtap;
(dynamic_trace_probes) -> boolean();
+ (end_time) -> non_neg_integer();
(elib_malloc) -> false;
(eager_check_io) -> boolean();
(ets_limit) -> pos_integer();
@@ -2620,6 +2621,7 @@ tuple_to_list(_Tuple) ->
(otp_release) -> string();
(os_monotonic_time_source) -> [{atom(),term()}];
(os_system_time_source) -> [{atom(),term()}];
+ (port_parallelism) -> boolean();
(port_count) -> non_neg_integer();
(port_limit) -> pos_integer();
(process_count) -> pos_integer();
@@ -2649,7 +2651,8 @@ tuple_to_list(_Tuple) ->
(trace_control_word) -> non_neg_integer();
(update_cpu_info) -> changed | unchanged;
(version) -> string();
- (wordsize | {wordsize, internal} | {wordsize, external}) -> 4 | 8.
+ (wordsize | {wordsize, internal} | {wordsize, external}) -> 4 | 8;
+ (overview) -> boolean().
system_info(_Item) ->
erlang:nif_error(undefined).