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The removal set now uses a red-black tree instead of an array on
large inputs, decreasing runtime complexity from `n*n` to
`n*log(n)`. It will also exit early when there are no more items
left in the removal set, drastically improving performance and
memory use when the items to be removed are present near the head
of the list.
This got a lot more complicated than before as the overhead of
always using a red-black tree was unacceptable when either of the
inputs were small, but this compromise has okay-to-decent
performance regardless of input size.
Co-authored-by: Dmytro Lytovchenko <[email protected]>
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The removal set now uses a red-black tree instead of an array on
large inputs, decreasing runtime complexity from `n*n` to
`n*log(n)`. It will also exit early when there are no more items
left in the removal set, drastically improving performance and
memory use when the items to be removed are present near the head
of the list.
This got a lot more complicated than before as the overhead of
always using a red-black tree was unacceptable when either of the
inputs were small, but this compromise has okay-to-decent
performance regardless of input size.
Co-authored-by: Dmytro Lytovchenko <[email protected]>
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A dirty scheduler is an un-managed thread so we need to
lock the msacc state on those.
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* john/erts/minusminus_trapping/OTP-15371:
Optimize operator '--' and yield on large inputs
Inline erts_cmp
Clarify a magical allocation size
Fix trapping in lists:reverse/2
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* maint-20:
Updated OTP version
Prepare release
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* rickard/internal_ref_cmp/OTP-15399/ERL-751:
Fix erts_internal_ref_number_cmp()
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* rickard/internal_ref_cmp/OTP-15399/ERL-751:
Fix erts_internal_ref_number_cmp()
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Introudce erts_queue_release_literals() to queue a literal area to be
released.
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* maint-18:
Updated OTP version
Prepare release
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Fix run_erl.c so it compiles on Solaris
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* jimdigriz/os_mon/fix_cpu_sup_android/OTP-15387:
Make Erlang's cpu_sup function better on Android
SELinux is another cause of MSG_CTRUNC
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The removal set now uses a red-black tree instead of an array on
large inputs, decreasing runtime complexity from `n*n` to
`n*log(n)`. It will also exit early when there are no more items
left in the removal set, drastically improving performance and
memory use when the items to be removed are present near the head
of the list.
This got a lot more complicated than before as the overhead of
always using a red-black tree was unacceptable when either of the
inputs were small, but this compromise has okay-to-decent
performance regardless of input size.
Co-authored-by: Dmytro Lytovchenko <[email protected]>
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This greatly increases the performance of '--'/2 which does a lot
of term comparisons.
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The first stage wasn't bounded by reductions, and it bumped far
more reductions than it should have due to a logic bug.
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In the implementation of the zero-copying term storage, we
want to preserve sharing, but not copy literals because the
modules holding the literals could be unloaded under our feet.
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Honor the max heap size when copying literals after purging
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Before this change, it was always the aux thread that was woken
to handle thread progress events scheduled to happen when all
schedulers were going to sleep. This was ok in the pre-OTP-21
implementation when the aux thread just slept on a tse. Now that
it sleeps in the fallback pollset this uses too much cpu so
instead we wake the thread that is doing the request if it is
a managed thread, or else we wake scheduler 1.
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The poll thread does a lot of waking up and then going
back to sleep. A large part of the waking up is managing
thread progress and a large part of that was using thread
specific data to get the thread progress data pointer.
With this refactor the tpd is passed to each of the functions
which greatly decreases the number of ethr_get_tsd calls
which in turn halves the CPU usage of the poller thread in
certain scenarios.
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* raimo/tcp-close-while-send/maint/ERL-561/OTP-12242:
Write test case
Fix hanging gen_tcp send vs close race
Conflicts:
erts/preloaded/ebin/prim_inet.beam
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While a gen_tcp send was in progress with filled buffers
and slow receiver a close (from another process) would place
the port in a half dead state so the port could not signal
back to send, that waited for confirmation.
The solution is to after some time (5 s) of waiting for
send confirmation set a monitor on the port, which detects
if the port becomes half dead due to close from another process.
The close pending loop has also been improved to use the linger
timeout for waiting, and to set a system timeout (arbitrarily
selected 3 min) to not wait forever when the other end
reads data s l o w l y (tarpitting, kind of).
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When a module has been purged from memory, any literals belonging
to that module will be copied to all processes that hold references
to them.
The max heap size limit would be ignored in the garbage collection
initiated when copying literals to a process. If the max heap size
was exceeded, the process would typically be terminated in the
following garbage collection.
Since the process would be killed anyway later, kill the process
before copying a literal that would make it exceed its max heap
size.
While at it, also fix a potential bug in `erlang:garbage_collect/0`.
If it was found that the max heap sized had been exceeded while
executing `erlang:garbage_collect/0`, the process would enter a
kind of zombie state instead of being properly terminated.
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* maint-20:
Updated OTP version
Prepare release
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* sverker/erts/debug_free_null:
erts: Fix bug in debug_free for NULL pointer
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* igor/tcp-nopush-ERL-698/OTP-15357:
"cork" tcp socket around file:sendfile
Add nopush TCP socket option
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* sverker/erts/ets-select_replace-bug/OTP-15346:
erts: Fix bug in ets:select_replace for bound key
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causing ASSERT in sys_memset to fail.
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* maint-21:
Updated OTP version
Prepare release
erts: Fix UNC path handling on Windows
erts: Fix a compiler warning
eldap: Fix race at socket close
Fix bug for sockopt pktoptions on BSD
erts: Fix memory leak on file read errors
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* john/erts/fix-unc-paths-windows/OTP-15333/ERL-737:
erts: Fix UNC path handling on Windows
erts: Fix a compiler warning
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* raimo/BSD-sockopt-pktoptions/ERIERL-187/OTP-14297:
Fix bug for sockopt pktoptions on BSD
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RaimoNiskanen/raimo/getifaddrs-netns/ERIERL-189/OTP-15121
Implement {netns,NS} option for inet:getifaddrs/1 and friends
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This fixes 200ms delay on the last TCP segment when using
file:sendfile/2 on Linux (ERL-698).
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* maint-17:
Updated OTP version
Prepare release
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maint-17
* sverker/r16/binary_to_atom-utf8-crash/ERL-474/OTP-14590:
erts: Fix crash in binary_to_atom/term for invalid utf8
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* sverker/big-bxor-bug/ERL-450/OTP-14514:
erts: Fix bug in bxor of a big negative number
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* sverker/bin2term-zlib-bug/ERL-340/OTP-14159:
erts: Fix binary_to_term for compressed and zlib >= v1.2.9
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* rickard/thr-prgr-unmanaged-delay-bug/OTP-13869:
Fix erts_thr_progress_unmanaged_delay()
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* rickard/drv-send-term-thr-bug/OTP-13866:
Fix thread calls to erl_drv_send_term()/erl_drv_output_term()
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* rickard/port-sig-dropped-fix/OTP-13424:
Fix implementation of dropped signal to port
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This is unlikely to be the last of the path problems seen after
OTP 21, and I'm starting to regret my decision to unconditionally
use long paths. The idea to hit all long-path problems all the time
was good in theory as it makes such bugs far more visible, but
there just aren't enough people who test pre-release versions on
Windows, making this the world's slowest game of whack-a-mole.
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This would've been a bug if the value was used.
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This translates to TCP_CORK on Linux and TCP_NOPUSH on
BSD.
In effect, this acts as super-Nagle: no partial TCP segments
are sent out until this option is turned off. Once turned off,
all accumulated unsent data is sent out immediately. The latter
is *not* the case on OSX, hence the implementation ignores
"nopush" on OSX to reduce confusion.
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* sverker/erts/ets-select_replace-bug/OTP-15346:
erts: Fix bug in ets:select_replace for bound key
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which may cause following calls to ets:next or ets:prev to fail.
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