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Also corrected compressed files on Windows
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The compressed format is using a slighty modified variant of the extern format
(term_to_binary). To not worsen key lookup's too much, the top tuple itself
and the key element are not compressed. Table objects with only immediate
non-key elements will therefor not gain anything (but actually consume one
extra word for "alloc_size").
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* rickard/cpu-groups/OTP-8861:
Generalize reader groups
Move cpu topology functionality into erl_cpu_topology.[ch]
Do not use more reader groups for schedulers than schedulers
Conflicts:
erts/emulator/beam/erl_init.c
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Reader groups have been generalized to cpu groups which can be
used for implementing reader groups, but also for implementing
other functionality in the future.
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When the runtime system had fewer schedulers than logical processors,
the system could get an unnecessarily large amount reader groups.
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* rickard/sys_schedule_debug:
Verify that no outstanding I/O exist when checking for I/O in debug build
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* pg/fix-system_info-cpu_topology-segfault:
Fix crash with erlang:system_info({cpu_topology,junk})
OTP-8914
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* rickard/sched-misc/OTP-8932:
Fix erts_schedule_misc_op() so it can be called from arbitrary threads
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* rickard/halfword-fix/OTP-8910:
Fix ERL_DRV_INT and ERL_DRV_UINT in halfword emulator
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* rickard/dist/OTP-8901:
Be less eager to set dist entry in busy state
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* rickard/tsd-get/OTP-8889:
Fix erl_drv_tsd_get() and enif_tsd_get()
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Tracing to port could cause an emulator crash when unloading the
trace driver.
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The runtime system is now less eager to suspend
processes sending messages over the distribution. The
default value of the distribution buffer busy limit
has also been increased from 128 KB to 1 MB. This in
order to improve throughput.
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Id: OTP-8912
This patch creates a new family of flags with the "+z" prefix. It
further creates a new configuration option called "dbbl" (which is the
first letter of the name dist_buf_busy_limit). Example usage of this
flag would be "+zdbbl 1048576".
This patch creates an adjustable buffer limit for the amount of data
that may be buffered by the erlang distribution code (in dist.c
specifically). Before this patch, this hard-coded constant was used:
#define ERTS_DE_BUSY_LIMIT (128*1024)
When large binaries are transmitted between nodes (or simply a lot of
medium-sized binaries), it is very easy to hit the old 128KB limit.
Processes that use the erlang:system_monitor() BIF to monitor system
events can be spammed by {monitor, busy_dist_port, ...} message tuples
at rates of tens to even hundreds of messages/second.
A larger buffer limit will allow processes to buffer more outgoing
messages over the distribution. When the buffer limit has been
reached, sending processes will be suspended until the buffer size has
shrunk. The buffer limit is per distribution channel. A higher limit
will give lower latency and higher throughput at the expense of
higher memory usage.
A variation of this patch has been in commercial production use in at
least two companies that the author is aware of. Larger buffer values
can reduce the number of {monitor, busy_dist_port, ...} system
messages drastically, lower overall messaging latencies, and prevent
false timeouts and 'nodedown' messages in extremely busy Mnesia systems.
Test suite: there are two tests:
a. In erlexec_SUITE.erl to test basic set & get of the value
b. In distribution_SUITE.erl, to verify that setting +zdbbl very
low will actually change behavior.
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A bug in erl_drv_tsd_get() and enif_tsd_get() could cause an
emulator crash. These functions are currently not used in OTP.
That is, the crash only occur on systems with user implemented
NIF libraries or drivers that use one of these functions.
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* rickard/halfword-bug:
Fix newly introduced halfword emulator bugs
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There is a bug in system_info BIF causing a crash if
erts_get_cpu_topology_term fails. The fix comes with a non-regression
test.
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It seems to work (at least on a little-endian architecture)
by sheer luck.
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In a70159b33f20a26b2674d7cf777617c5f0261a5c, the _VOID_ macro
was eliminated, but one use of it inside an "#ifdef DEBUG"
was forgotten.
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* rickard/timer-wheel/OTP-8835:
Use mutex instead of rwlock
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* pan/binary-bif-valgrind-leak/OTP-8823:
Teach erl_bif_binary not leak memory by doing malloc(0)
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Use mutex instead of rwlock since the read lock is more or less
unused and it can be quite contended.
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Spin wait on most ethread rwlocks used by the runtime system was
unintentionally disabled during development. Spin wait has now been enabled
again. This bug appeared in commit 59ee2a593090e7d53c97ceba63cbd300d1b9657e,
i.e., it has not been seen in any released versions.
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The scheduler wakeup threshold is now possible to adjust at system boot.
For more information see the `+swt' command line argument of `erl'.
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Lower the scheduler wakeup threshold since schedulers aren't spuriously
woken as before (since commit 59ee2a593090e7d53c97ceba63cbd300d1b9657e).
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Added erlang:system_info(build_type) which makes it
easier to chose drivers, NIF libraries, etc based
on build type of the runtime system.
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* rickard/cpu-info-testcase/OTP-8765:
Fix crash when calling erlang:system_info(update_cpu_info)
Add testcase for erlang:system_info(update_cpu_info)
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* pg/fix-segfault-on-crash_dump-with-hipe:
Fix segmentation fault when dumping the crash log with hipe enabled and natively compiled modules
OTP-8801
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* mp/fix-hipe-on_load_crash:
fix native code crash when calling unloaded module with on_load function
OTP-8799
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Calling erlang:system_info(update_cpu_info) on platforms where no
CPU topology was found could result in a crash if other CPU
information had changed. This bug was introduced in the 'dev'
branch before R14B (commit 1b273b618002d65159453fdfb9520a9476e4423a).
That is, the bug has never been seen in a released runtime system.
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* rickard/cpu-info-unbind/8765:
Fix erroneous error reports about unbind failure
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On platforms where binding of schedulers is not supported, numerous error
reports on the form "Scheduler <N> failed to unbind from cpu -1: enotsup"
were erroneously issued. This bug was introduced in the 'dev' branch
before R14B (commit 1b273b618002d65159453fdfb9520a9476e4423a). That is,
the bug has never been seen in a released runtime system.
Reported-By: Tuncer Ayaz
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* pan/ets_binary_overhead/OTP-8762:
Remove binary overhead counter from ets objects
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* sverker/NIF-64bit-integers/OTP-8746:
Make windows 64bit types be declared more consistently
Teach Windows about the int64 functions
NIF doc official support note
NIF 64-bit integer support
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* egil/R14A/binary-gc-wrap/OTP-8730:
Increase vheap counter to Uint64
Fix wrapping in next vheap calculation
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* pan/local_univ_time_bsd/OTP-8580:
Teach erl_time_sup to handle timezones w/o DST on FreeBSD as on other platforms
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* rickard/cpu-info/OTP-8765:
Initialize environment functionality after thread lib
Fix faulty assertions
Implement automatic detection of CPU topology on Windows
Make it possible to reread and update detected CPU information
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