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Microstate accounting is a way to track which state the
different threads within ERTS are in. The main usage area
is to pin point performance bottlenecks by checking which
states the threads are in and then from there figuring out
why and where to optimize.
Since checking whether microstate accounting is on or off is
relatively expensive if done in a short loop only a few of the
states are enabled by default and more states can be enabled
through configure.
I've done some benchmarking and the overhead with it turned off
is not noticible and with it on it is a fraction of a percent.
If you enable the extra states, depending on the benchmark,
the ovehead when turned off is about 1% and when turned on
somewhere inbetween 5-15%.
OTP-12345
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The perf_counter is a very very cheap and high resolution timer
that can be used to timestamp system events. It does not have
monoticity guarantees, but should on most OS's expose a monotonous
time.
A special instruction has been created for this counter to further
speed up fetching it.
OTP-12908
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* maint:
Introduce time management in native APIs
Introduce time warp safe replacement for safe_fixed option
Introduce time warp safe trace timestamp formats
Conflicts:
erts/emulator/beam/erl_bif_trace.c
erts/emulator/beam/erl_driver.h
erts/emulator/beam/erl_nif.h
erts/emulator/beam/erl_trace.c
erts/preloaded/ebin/erlang.beam
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* lukas/erts/gc_info/OTP-13265:
erts: Add garbage_collection_info to process_info/2
Conflicts:
erts/emulator/beam/erl_bif_info.c
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Rename release_archives/0 to purge_archive_cache/0 to make it
clearer what it does and what it doesn't do. Also add a comment
about its intended purpose.
Note that release_archives/0 is not documented and is part of the
experimental archive feature. Furthermore, the only uses I could find
were in the test suite. I did not find any uses in the external
applications relx and rebar3 applications that are known to use
archives. Therefore, I think that the increased clarity is worth
the small risk of breaking code.
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The timeout routine for efile was never called. While at it,
eliminate the n_timeouts field and simplify the logic.
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prim_do_release_archives/3 can't make up its mind whether the
primary archive should be released or not. The key in the process
dictionary is kept, while #prim_state.primary_archive is cleared.
It seems that intent was the primary archive should be preserved,
because the function was intended to be called by a timeout routine
every sixth minute (it is not because of a bug in setting up
the timeout).
Therefore, rewrite the code to preserve the primary archive and
simplify it while at it. Also, rename prim_release_archives/1 to
prim_purge_cache/0 to make it clearer what it is doing.
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The #prim_state.cache' field is unused. The actual cache is kept
in the process dictionary.
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New timestamp options for trace, sequential trace, and
system profile:
- monotonic_timestamp
- strict_monotonic_timestamp
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by ignoring literals.
erts_internal:check_process_code will be called again anyway
(with option {copy_literals, true}) before the module is actually purged.
No need to check literals twice.
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Move impl from erlang to erts_internal. Cut and paste.
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* Same process must do enable-disable.
* System process will force it and never get 'aborted'
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as it's not a public interface.
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Problem: erlang:purge_module/1 is not safe in the sense
that very bad things may happen if the code to be purged
is still referred to by live processes.
Introduce erts_internal:purge_module which is the same as the old
erlang:purge_module BIF (except it returns false if no such old module).
Implement erlang:purge_module in Erlang and let it invoke
erts_code_purger for safe purging where all clogging processes
first are killed.
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by moving code from code_server to erts_code_purger.
This is more or less a copy-paste from code_server.erl
to erts_code_purger.erl. All the inner mechanics of
code:purge/1 and code:soft_purge/1 are unchanged.
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as a system process with preloaded code.
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* maint:
Light weight statistics of run queue lengths
Conflicts:
erts/preloaded/ebin/erlang.beam
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- statistics(total_run_queue_lengths)
- statistics(run_queue_lengths)
- statistics(total_active_tasks)
- statistics(active_tasks)
Conflicts:
erts/emulator/beam/erl_process.c
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Part of the return value for string_match/3 is not used by
its only caller. Eliminate the unused part of the return value
and the accumulator argument for string_match().
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We don't need absolute paths unless we are dealing with archives.
Since it is not free to turn a relative path absolute (we will need a
call to prim_file to fetch the current directory), it's better to
delay the call to absname/1 until we are sure it's needed.
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There is no need to use the concat/1 function since all arguments
that are passed to it have known types.
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The 'init' module fetches command line parameters and passes them
to erl_prim_loader:start/3.
The code can be simplified if 'init' calls a new
erl_prim_loader:start/0 function that itself fetches the necessary
command line parameters. Also remove the documentation for the start()
function, since it there is no way that it can be usefully called by
a user application.
While we are at it, also get rid of '-id' command line parameter,
which is fetched and stored but never actually used.
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erl_prim_loader:get_files/2 was an optimization introduced before the
SMP emulator (that is, before R11). The idea was to use the async
threads in the efile driver to read multiple BEAM files from the disk
in parallel.
In a modern computer with the SMP emulator, loading a BEAM module
seems to be more time-consuming than reading it from disk. To optimize
loading we would need to load several modules in parallel. We could
modify get_files/2 so that it would support parallel loading, but it
is cleaner to first remove get_files/2 and then (in a future commit),
introduce new functions to support parallel loading.
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The deep indentation makes loop/3 difficult to read and maintain.
Break out the request handling code into a separate function.
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Kostis Sagonas pointed out that there is a dialyzer warning
for constructing an improper list in the following clause:
translate_response(?FILE_RESP_N2DATA = X,
[<<_:64, _:64, _:64>> | <<>>] = Data) ->
{error, {bad_response_from_port, [X | Data]}};
I don't want to change the code to somehow eliminate the warning. An
improper list has already been constructed in the efile driver itself,
and that would be difficult to fix.
Therefore, tell dialyzer to ignore warnings for improper lists
in translate_response/2.
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The compact wall of arguments makes it hard to see what is actually
happening in eval_script().
Collect the arguments into a record.
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Expansion of $ROOT in paths are handled specially compared to boot
variables. There is no reason $ROOT can't be handled as a boot
variable.
We can simplify the expansion of boot variables if we spend a little
extra effort upfront collecting all boot variables into a map.
Make the error checking for -boot_var arguments stricter. Only allow
-boot_var followed by exactly two arguments to help users catch
errors earlier.
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The last clause in start_it/1 calls a function in some module.
It goes to great length to catch any exception and pass them on
unchanged, and if there was a normal return, it will just return
the return value. It can been seen that the entire 'catch'
construction with the reference trick is totally unnecessary.
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The get_flag/3 function which returns a default value if the
flag doesn't exist, is implemented in terms of get_flag/2
which throws an exception if the flag doesn't exist.
get_flag/3 is frequently used for the flags that don't exist,
which means that means that an exception will be generated and
catched for no good reason.
Reimplement get_flag/3 so that it doesn't have to call get_flag/2
and catch an exception. Eliminate the get_flag/2 function by
writing a special purpose function for the only time it's used,
that is for retrieving the value for the -root flag. As a
side-effect, we will get a nicer error message if there is
something wrong with the -root flag.
Similarly, simplify get_flag_list/3 and remove get_flag_list/2.
We can also eliminate search/3 and use the lists:keyfind/3
BIF instead.
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The handling of flags has been incrementally messed up over
time, leading to convoluted code. Rewrite the parsing and
lookup of flags. By using the appropriate data structures,
the code will become simpler.
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* lukas/erts/forker: (28 commits)
erts: Never abort in the forked child
erts: Mend ASSERT makro for erl_child_setup
erts: Allow enomem failures in port_SUITE
erts: iter_port sleep longer on freebsd
erts: Allow one dangling fd if there is a gethost port
erts: Only use forker StackAck on freebsd
erts: It is not possible to exit the forker driver
erts: Add forker StartAck for port start flowcontrol
erts: Fix large open_port arg segfault for win32
erts: Fix memory leak at async open port
kernel: Remove cmd server for unix os:cmd
erts: Add testcase for huge port environment
erts: Move os_pid to port hash to child setup
erts: Handle all EINTR and EAGAIN cases in child setup
erts: Make child_setup work with large environments
erts: Fix forker driver ifdefs for win32
erts: Fix uds socket handling for os x
erts: Fix dereferencing of unaligned integer for sparc
erts: Flatten too long io vectors in uds write
erts: Add fd count test for spawn_driver
...
Conflicts:
erts/emulator/beam/erl_node_tables.c
erts/preloaded/src/erts_internal.erl
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OTP-13086
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* egil/term_type/OTP-13172:
Test erts_internal:term_type/1
erts: Let term_type/1 encompass all types
erts: Change erts_internal:map_type/1 into term_type/1
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* rickard/ohmq-fixup/OTP-13047:
Replace off_heap_message_queue option with message_queue_data option
Always use literal_alloc
Distinguish between GC disabled by BIFs and other disabled GC
Fix process_info(_, off_heap_message_queue)
Off heap message queue test suite
Remove unused variable
Fix memory leaks
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The message_queue_data option can have the values
- off_heap
- on_heap
- mixed
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to support other terms, not just maps
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* np/sharing-preserved-copy/OTP-12590: (28 commits)
Refactor have seq_trace token test
Use sharing preserving copy error messages and exceptions
Use sharing preserving copy in enif_make_copy
Refactor sharing preserved copy flags
Fix rebase of SHCOPY seq_tokens
Fix erts_debug:copy_shared/1 prototype
Update preloaded module erlang.beam
Add erlang:copy_literals/2 spec
Add copy_literals testcase
Do not use GCC extensions in copy
Use copy literal range check in message passing and purging
Add BIF for setting internal copy literal range
Copy literals in copy sharing
Refactor copy sharing
Add support for HAMT maps in preserved copy
Fix Map preserved sharing copy implementation
Fix Halfword removal
Fix internal stacks
Add support for maps in preserved copy
Add --enable-sharing-preserving configure flag
...
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* lrascao/fix/vm_crash_on_init_restart:
Fix crash on init restart
OTP-13115
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