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This improves the latency of file operations as dirty schedulers
are a bit more eager to run jobs than async threads, and use a
single global queue rather than per-thread queues, eliminating the
risk of a job stalling behind a long-running job on the same thread
while other async threads sit idle.
There's no such thing as a free lunch though; the lowered latency
comes at the cost of increased busy-waiting which may have an
adverse effect on some applications. This behavior can be tweaked
with the +sbwt flag, but unfortunately it affects all types of
schedulers and not just dirty ones. We plan to add type-specific
flags at a later stage.
sendfile has been moved to inet_drv to lessen the effect of a nasty
race; the cooperation between inet_drv and efile has never been
airtight and the socket dying at the wrong time (Regardless of
reason) could result in fd aliasing. Moving it to the inet driver
makes it impossible to trigger this by closing the socket in the
middle of a sendfile operation, while still allowing it to be
aborted -- something that can't be done if it stays in the file
driver.
The race still occurs if the controlling process dies in the short
window between dispatching the sendfile operation and the dup(2)
call in the driver, but it's much less likely to happen now.
A proper fix is in the works.
--
Notable functional differences:
* The use_threads option for file:sendfile/5 no longer has any
effect.
* The file-specific DTrace probes have been removed. The same
effect can be achieved with normal tracing together with the
nif__entry/nif__return probes to track scheduling.
--
OTP-14256
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OTP-13760
SCTP connect could return error even if the connect is ongoing
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gen_sctp:connect_init/4 could return error even though the connect are in progress.
I.e. connect on socket returned "in progress".
The error can come from packet_inet_output() which is checking the socket for errors.
The issue here is that from erlang you don't think the connect is still ongoing.
But you will receive a sctp_assoc_change message later on.
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* sverker/dist-send-noreply-opt/OTP-14689:
erts: Improve distribution send operations
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* kvakvs/zero-size-read_file/ERL-327/PR-1524/OTP-14637:
erts: On zero-size files attempt to read until EOF
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by ignoring reply earlier.
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All operations will now yield appropriately, allowing them to be used
freely in concurrent applications. This commit also deprecates the
functions listed below, although they won't raise deprecation
warnings until OTP 21:
zlib:adler32
zlib:crc32
zlib:inflateChunk
zlib:getBufSize
zlib:setBufSize
The behavior of throwing an error when a dictionary is required for
decompression has also been deprecated.
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* maint:
Updated OTP version
Update release notes
Update version numbers
Fix doc for the 'quiet' option; it defaults to false
asn1: Fix missing quotes of external encoding call
Add a dedicated close function for TCP ports to prevent issues like ERL-430/448
Close TCP ports properly on send timeout
erts: Add missing release note
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* maint-20:
Updated OTP version
Update release notes
Update version numbers
Fix doc for the 'quiet' option; it defaults to false
asn1: Fix missing quotes of external encoding call
Add a dedicated close function for TCP ports to prevent issues like ERL-430/448
Close TCP ports properly on send timeout
erts: Add missing release note
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* john/erts/fix-tcp-send-timeout/OTP-14509/ERL-448:
Add a dedicated close function for TCP ports to prevent issues like ERL-430/448
Close TCP ports properly on send timeout
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This refactor was done using the unifdef tool like this:
for file in $(find erts/ -name *.[ch]); do unifdef -t -f defile -o $file $file; done
where defile contained:
#define ERTS_SMP 1
#define USE_THREADS 1
#define DDLL_SMP 1
#define ERTS_HAVE_SMP_EMU 1
#define SMP 1
#define ERL_BITS_REENTRANT 1
#define ERTS_USE_ASYNC_READY_Q 1
#define FDBLOCK 1
#undef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
#define ERTS_POLL_ASYNC_INTERRUPT_SUPPORT 0
#define ERTS_POLL_USE_WAKEUP_PIPE 1
#define ERTS_POLL_USE_UPDATE_REQUESTS_QUEUE 1
#undef ERTS_HAVE_PLAIN_EMU
#undef ERTS_SIGNAL_STATE
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* john/erts/runtime-lcnt:
Document rt_mask and add warnings about copy_save
Add an emulator test suite for lock counting
Break erts_debug:lock_counters/1 into separate BIFs
Allow toggling lock counting at runtime
Move lock flags to a common header
Enable register_SUITE for lcnt builds
Enable lcnt smoke test on all builds that have lcnt enabled
Make lock counter info independent of the locks being counted
OTP-14412
OTP-13170
OTP-14413
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The implementation is still hidden behind ERTS_ENABLE_LOCK_COUNT, and
all categories are still enabled by default, but the actual counting can be
toggled at will.
OTP-13170
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* john/erts/fix-port-leak/OTP-13939/ERL-193:
Add a testcase for OTP-13939/ERL-193
Mark socket disconnected on tcp_send_or_shutdown_error
# Conflicts:
# lib/kernel/test/gen_tcp_misc_SUITE.erl
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* maint-19:
Updated OTP version
Update release notes
Update version numbers
Fix statistics(wall_clock) and statistics(runtime) implementation
fixup! erts: Cleanup dropped port tasks correctly
erts: Add tests to detect port close race
Add a testcase for OTP-13939/ERL-193
erts: Cleanup dropped port tasks correctly
Mark socket disconnected on tcp_send_or_shutdown_error
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* john/erts/fix-port-leak/OTP-13939/ERL-193:
Add a testcase for OTP-13939/ERL-193
Mark socket disconnected on tcp_send_or_shutdown_error
# Conflicts:
# lib/kernel/test/gen_tcp_misc_SUITE.erl
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The socket left lingering due to {exit_on_close, false} will accept writes
in a confusing way, returning either enotconn or blocking. This fix allows
socket to know that it has been closed recently, and new writes won't pass.
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* maint:
Updated OTP version
Update release notes
Update version numbers
erts: Fix so that 81b628 (sigterm=kill) works
Updated OTP version
Prepare release
Unconditionally clear IO buffers on send/shutdown errors
Conflicts:
OTP_VERSION
erts/emulator/sys/unix/sys.c
erts/vsn.mk
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This fixes a bug where a send/shutdown error on an active-mode socket results
in the port never being properly closed.
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bind to device is needed to properly support VRF-Lite under
Linux (see [1] for details).
[1]: https://www.kernel.org/doc/Documentation/networking/vrf.txt
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* goeldeepak/erts/fix_inet_gethost_long/ERL-61/PR-1345/OTP-14310:
This patch fixes the issue in which erlang fails to start if the hostname is 64 characters on a linux system.
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if the hostname is 64 characters on a linux system.
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Work around broken build system by checking
actual zlib version in runtime.
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ERL_DRV_USE_NO_CALLBACK only meaningful when deselecting.
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* g-andrade/kernel/fetch_ztream_dictionary/PR-1139/OTP-13842:
Update preloaded modules
Specify min zlib ver on inflateGetDictionary doc
Skip inflateGetDictionary test case if unsupported
zlib: Only link inflateGetDictionary if available
zlib: Add test case for inflateGetDictionary
zlib: support extraction of inflation dictionary
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Which at the moment means zlib versions >= 1.2.8.
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* saleyn/uds/PR-612/OTP-13572:
AF_UNIX is more portable
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Fix dialyzer warning for improper list in prim_inet
by not using an improper list.
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* saleyn/uds/PR-612/OTP-13572:
Rewrite inet* for address family 'local'
Rewrite inet_drv for AF_LOCAL
Assign externally open fd to gen_tcp (UDS support)
Conflicts:
erts/preloaded/ebin/prim_inet.beam
lib/kernel/doc/src/gen_tcp.xml
lib/kernel/doc/src/gen_udp.xml
lib/kernel/src/inet6_sctp.erl
lib/kernel/test/inet_SUITE.erl
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* henrik/update-copyrightyear:
update copyright-year
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OTP-13251
* sverk/halt-INT_MIN:
erts: Make erlang:halt() accept bignums as Status
erts: Change erl_exit into erts_exit
kernel: Remove calls to erl_exit
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