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As of ERTS version 5.9 (OTP-R15B) the runtime system will by default
not bind schedulers to logical processors.
If the Erlang runtime system is the only operating system process that
binds threads to logical processors, this improves the performance of
the runtime system. However, if other operating system processes (as
for example another Erlang runtime system) also bind threads to logical
processors, there might be a performance penalty instead. In some cases
this performance penalty might be severe. Due to this, we change the
default so that the user must make an active decision in order to bind
schedulers.
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Queues used for communication between async threads and scheduler threads
have been replaced with lock-free queues.
Drivers using the driver_async functionality are not automatically locked
to the system anymore, and can be unloaded as any dynamically linked in
driver.
Scheduling of ready async jobs is now also interleaved in between other
jobs. Previously all ready async jobs was performed at once.
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A number of memory allocation optimizations have been implemented. Most
optimizations reduce contention caused by synchronization between
threads during allocation and deallocation of memory. Most notably:
* Synchronization of memory management in scheduler specific allocator
instances has been rewritten to use lock-free synchronization.
* Synchronization of memory management in scheduler specific
pre-allocators has been rewritten to use lock-free synchronization.
* The 'mseg_alloc' memory segment allocator now use scheduler specific
instances instead of one instance. Apart from reducing contention
this also ensures that memory allocators always create memory
segments on the local NUMA node on a NUMA system.
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Conflicts:
erts/doc/src/notes.xml
erts/emulator/drivers/common/inet_drv.c
erts/vsn.mk
lib/kernel/test/gen_sctp_SUITE.erl
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* ta/docs-fixes:
Fix misspelling of intermediate
Fix typos in erts/preloaded/src
Fix more misspellings of compatibility
Fix misspelling of kept
Fix misspelling of compatibility in ssl_basic_SUITE
Fix misspelling of compatibility
Fix misspelling of accommodate
Fix misspelling of exceed
Fix misspelling of accidentally
Fix misspelling of erroneous in xmerl_xsd
Fix misspelling of erroneous
Fix misspelling of successful
Fix typos in instrument(3)
Fix typos in dbg(3)
dialyzer: fix a small typo in list_to_bitstring test
Fix typos in cover.erl
Fix typos (variable name) in erl_nif(3)
Fix typos in mod_esi(3)
Fix trivial typos in erlang(3)
OTP-9555
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* pan/win_erlsrv_stop/OTP-9344:
Move init of smp rw mutex from init to sys_args to make sure that it is initialized before the first erts_sys_getenv call
Move erts_sys_env_init() to erts_sys_pre_init()
Remove _DEBUG from start_erl.c
Spelling correction in erlsrv doc
Convert windows start_erl to take rootdir on command line
Add command start_disabled to erlsrv
Add global lock for erlsrv to avoid races
Change start order so that service_event gets initialized before it's used
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* fm/external_size_2:
Add erlang:external_size/2 BIF
OTP-9528
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The functions zlib:deflateSetDictionary/2 and zlib:inflateSetDictionary/2
accept iodata() as Dictionary.
The functions zlib:crc32/2,3, zlib:adler32/2,3, zlib:compress/1,
zlib:uncompress/1, zlib:zip/1, and zlib:unzip/1 accept iodata() as
data.
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This BIF's second parameter is a list of options.
Currently the only allowed option is {minor_version, Version}
where version is either 0 (default) or 1.
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Add erlang:check_old_code/1 to quickly check whether a module
has old code. If there is no old code, there is no need to call
erlang:check_process_code/2 for all processes, which will save
some time if there are many processes.
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Conflicts:
erts/vsn.mk
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* hw/fix-doc-typos:
Fix typos in the epmd documentation
OTP-9387
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An incorrect spec, rpc:yield/1, has been fixed.
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Filipe David Manana
OTP-9114: [ftp] Added (type) spec for all exported functions.
OTP-9123: mod_esi:deliver/2 made to accept binary data.
Bernard Duggan
OTP-9124: [httpd] Prevent XSS in error pages.
Michael Santos
OTP-9131: [httpd] Wrong security property names used in documentation.
Garrett Smith
OTP-9157: [httpd] Improved error messages.
Ricardo Catalinas Jim�nez
OTP-9158: [httpd] Fix timeout message generated by mod_esi.
Bernard Duggan
OTP-9202: [httpd] Extended support for file descriptors.
Attila Rajmund Nohl
OTP-9230: The default ssl kind has now been changed to essl.
OTP-9246: [httpc] httpc manager crash because of a handler retry
race condition.
Merge branch 'bmk/inets/inet56_integration' into dev
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* jf/run_erl-disable-flow-control:
Teach run_erl RUN_ERL_DISABLE_FLOWCNTRL for disabling flow control
OTP-9270
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Conflicts:
erts/vsn.mk
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Flow control can cause unwanted behaviour of the beam process,
if accidentally hit Ctrl-S (instead of Ctrl-D to detach) the
entire beam may be blocked.
Fix this problem by making it possible to turn off flow
control by setting the environment variable RUN_ERL_DISABLE_FLOWCNTRL.
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* ta/driver_entry-typo:
driver_entry: Remove gratuitous paren and fix typo
OTP-9254
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* sverker/enif_is_exception/OTP-9150:
add support for checking if an ERL_NIF_TERM is an exception
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Conflicts:
erts/vsn.mk
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* bjorn/erts/remove-init_get_args-doc/OTP-9209:
Remove documentation for non-existent init:get_args/0
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init:get_args/0 was deprecated in R9C and removed in R12B.
Reported-by: Eric Pailleau
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* hw/epmd-bind-to-address:
Allow user to specify the IP address epmd binds to
OTP-9213
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* ta/driver_entry-typos-re:
Remove gratuitous paren in driver_entry
OTP-9192
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* gl/erts-doterlang-docs:
Add back documentation on .erlang processing
OTP-9189
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