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2014-01-28initial support for dirty schedulers and dirty NIFsSteve Vinoski
Add initial support for dirty schedulers. There are two types of dirty schedulers: CPU schedulers and I/O schedulers. By default, there are as many dirty CPU schedulers as there are normal schedulers and as many dirty CPU schedulers online as normal schedulers online. There are 10 dirty I/O schedulers (similar to the choice of 10 as the default for async threads). By default, dirty schedulers are disabled and conditionally compiled out. To enable them, you must pass --enable-dirty-schedulers to the top-level configure script when building Erlang/OTP. Current dirty scheduler support requires the emulator to be built with SMP support. This restriction will be lifted in the future. You can specify the number of dirty schedulers with the command-line options +SDcpu (for dirty CPU schedulers) and +SDio (for dirty I/O schedulers). The +SDcpu option is similar to the +S option in that it takes two numbers separated by a colon: C1:C2, where C1 specifies the number of dirty schedulers available and C2 specifies the number of dirty schedulers online. The +SDPcpu option allows numbers of dirty CPU schedulers available and dirty CPU schedulers online to be specified as percentages, similar to the existing +SP option for normal schedulers. The number of dirty CPU schedulers created and dirty CPU schedulers online may not exceed the number of normal schedulers created and normal schedulers online, respectively. The +SDio option takes only a single number specifying the number of dirty I/O schedulers available and online. There is no support yet for programmatically changing at run time the number of dirty CPU schedulers online via erlang:system_flag/2. Also, changing the number of normal schedulers online via erlang:system_flag(schedulers_online, NewSchedulersOnline) should ensure that there are no more dirty CPU schedulers than normal schedulers, but this is not yet implemented. You can retrieve the number of dirty schedulers by passing dirty_cpu_schedulers, dirty_cpu_schedulers_online, or dirty_io_schedulers to erlang:system_info/1. Currently only NIFs are able to access dirty scheduler functionality. Neither drivers nor BIFs currently support dirty schedulers. This restriction will be addressed in the future. If dirty scheduler support is present in the runtime, the initial status line Erlang prints before presenting its interactive prompt will include the indicator "[ds:C1:C2:I]" where "ds" indicates "dirty schedulers", "C1" indicates the number of dirty CPU schedulers available, "C2" indicates the number of dirty CPU schedulers online, and "I" indicates the number of dirty I/O schedulers. Document The dirty NIF API in the erl_nif man page. The API closely follows Rickard Green's presentation slides from his talk "Future Extensions to the Native Interface", presented at the 2011 Erlang Factory held in the San Francisco Bay Area. Rickard's slides are available online at http://bit.ly/1m34UHB . Document the new erl command-line options, the additions to erlang:system_info/1, and also add the erlang:system_flag/2 dirty scheduler documentation even though it's not yet implemented. To determine whether the dirty NIF API is available, native code can check to see whether the C preprocessor macro ERL_NIF_DIRTY_SCHEDULER_SUPPORT is defined. To check if dirty schedulers are available at run time, native code can call the boolean enif_have_dirty_schedulers() function, and Erlang code can call erlang:system_info(dirty_cpu_schedulers), which raises badarg if no dirty scheduler support is available. Add a simple dirty NIF test to the emulator NIF suite.
2014-01-24Merge branch 'blt/doc_language_improvement'Henrik Nord
* blt/doc_language_improvement: Clean up some awkward wording around the +spp flag. OTP-11607
2014-01-23Add support for scheduler utilization balancingRickard Green
For more information see documentation of the new command line argument +sub
2013-12-09Clean up some awkward wording around the +spp flag.Brian L. Troutwine
This issue was pointed out by lpgauth in #erlounge. While the intention is clear, the original wording was a bit dodgy. I'm no grammarian--though I am a native speaker--so it's quite possible the new wording I've introduced is not impeachable. Should be idiomatic, though. Signed-off-by: Brian L. Troutwine <[email protected]>
2013-09-30Merge branch 'maint'Lukas Larsson
* maint: Update preloaded add system_info(ets_limit) Conflicts: erts/preloaded/ebin/erlang.beam
2013-09-24add system_info(ets_limit)Steve Vinoski
Add system_info(ets_limit) to provide a way to retrieve the runtime's maximum number of ETS tables. Add tests and documentation for it too. Also repair the alphabetical order of system_info/1 argument descriptions in the documentation and in the erlang.erl clauses. Add new preloaded erlang.erl due to that change. Also ensure all system_info/1 clauses are represented in the erlang.xml source documentation -- a couple had been inadvertently dropped in previous commits when other clauses were added.
2013-08-30Merge branch 'maint'Lukas Larsson
* maint: add erl option to set schedulers by percentages
2013-08-29add erl option to set schedulers by percentagesSteve Vinoski
For applications where measurements show enhanced performance from the use of a non-default number of emulator scheduler threads, having to accurately set the right number of scheduler threads across multiple hosts each with different numbers of logical processors is difficult because the erl +S option requires absolute numbers of scheduler threads and scheduler threads online to be specified. To address this issue, add a +SP option to erl, similar to the existing +S option but allowing the number of scheduler threads and scheduler threads online to be set as percentages of logical processors configured and logical processors available, respectively. For example, "+SP 50:25" sets the number of scheduler threads to 50% of the logical processors configured, and the number of scheduler threads online to 25% of the logical processors available. The +SP option also interacts with any settings specified with the +S option, such that the combination of options "+S 4:4 +SP 50:50" (in either order) results in 2 scheduler threads and 2 scheduler threads online. Add documentation for the +SP option. Add tests for the +SP option to scheduler_SUITE. Add tests and documentation for two existing features of the +S option: +S 0:0 resets the scheduler thread count and scheduler threads online count to their defaults, and specifying negative numbers for +S results in those values being subtracted from the default values for the host.
2013-06-12Merge branch 'maint'Rickard Green
* maint: erts: Add the +sfwi system flag
2013-06-11erts: Add the +sfwi system flagRickard Green
+sfwi Interval Set scheduler forced wakeup interval. All run queues will be scanned each Interval milliseconds. While there are sleeping schedulers in the system, one scheduler will be woken for each non-empty run queue found. An Interval of zero disables this feature, which also is the default. This feature has been introduced as a temporary workaround for lengthy executing native code, and native code that do not bump reductions properly in OTP. When these bugs have be fixed the +sfwi flag will be removed.
2013-05-30Merge branch 'maint'Rickard Green
* maint: Introduce a better id allocation algorithm for PTabs
2013-05-30Merge branch 'rickard/ptab-id-alloc/OTP-11077' into maintRickard Green
* rickard/ptab-id-alloc/OTP-11077: Introduce a better id allocation algorithm for PTabs
2013-05-17Introduce a better id allocation algorithm for PTabsRickard Green
2013-04-19Convert XML files to UTF-8Hans Bolinder
2013-04-17Add documentation of w, i and e addition to +fnu and +fna switches to erlSiri Hansen
These were documented in the stdlib user's guide, but not in the reference manual for erl. This has now been corrected.
2013-04-05Merge branch 'maint-r16' into maintPatrik Nyblom
Conflicts: erts/vsn.mk
2013-04-03Be less eager requesting wakeup for cleanup jobsRickard Green
2013-03-18Set unique anchor on +pc flag in erl.xmlPatrik Nyblom
2013-02-25Set default max ports on win32 to 8192Lukas Larsson
2013-02-22Merge branch 'pan/unicode_printable_ranges'Patrik Nyblom
* pan/unicode_printable_ranges: Adapt stdlib tests to ~tp detecting latin1 binaries Update primary bootstrap Make wx debugger use +pc flag when applicable Correct misspelled comments and space at lin ends Make ~tp output latin1 binaries as strings if possible Leave the +pc handling to io and io_lib_pretty Remove newly introduced warning in erlexec.c Make shell_SUITE:otp_10302 use +pc unicode when needed Fix io_proto_SUITE to handle the new io_lib_pretty:print Add testcase for +pc and io:printable_range/0 Make printing of UTF-8 in binaries behave like lists. Document +pc flag and io:printable_range/0 Add usage of and spec for io:printable_range/0 Add +pc {latin1|unicode} switch and io:printable_range/0 Fix some Unicode issues OTP-18084
2013-02-20Changed documentation for +sws optionFredrik Gustafsson
2013-02-18Document +pc flag and io:printable_range/0Patrik Nyblom
2013-01-25Update copyright yearsBjörn-Egil Dahlberg
2013-01-23Merge branch 'rickard/rg-default/OTP-10737'Rickard Green
* rickard/rg-default/OTP-10737: Raise default reader group limit to 64
2013-01-23Merge branch 'rickard/r16/port-optimizations/OTP-10336'Rickard Green
* rickard/r16/port-optimizations/OTP-10336: Bump reductions also for immediate driver calls Add 'port_count' and 'port_limit' to system_info/1 spec Fix documentation Replace use of deprecated functions in test cases Replace use of driver_send_term() with erl_drv_send_term() Conflicts: erts/preloaded/ebin/erlang.beam
2013-01-23Merge branch 'rickard/async-default/OTP-10736'Rickard Green
* rickard/async-default/OTP-10736: Use async threads by default
2013-01-23Merge branch 'rickard/+stbt/OTP-10668'Rickard Green
* rickard/+stbt/OTP-10668: Add +stbt erl command line switch
2013-01-21Raise default reader group limit to 64Rickard Green
2013-01-21Use async threads by defaultRickard Green
2013-01-08Add +stbt erl command line switchRickard Green
2012-12-20Fix documentationRickard Green
2012-12-07Merge branch 'rickard/port-optimizations/OTP-10336' into ↵Rickard Green
rickard/r16/port-optimizations/OTP-10336 * rickard/port-optimizations/OTP-10336: Change annotate level for emacs-22 in cerl Update etp-commands Add documentation on communication in Erlang Add support for busy port message queue Add driver callback epilogue Implement true asynchronous signaling between processes and ports Add erl_drv_[send|output]_term Move busy port flag Use rwlock for driver list Optimize management of port tasks Improve configuration of process and port tables Remove R9 compatibility features Use ptab functionality also for ports Prepare for use of ptab functionality also for ports Atomic port state Generalize process table implementation Implement functionality for delaying thread progress from unmanaged threads Conflicts: erts/doc/src/erl_driver.xml erts/doc/src/erlang.xml erts/emulator/beam/beam_bif_load.c erts/emulator/beam/beam_bp.c erts/emulator/beam/beam_emu.c erts/emulator/beam/bif.c erts/emulator/beam/copy.c erts/emulator/beam/erl_alloc.c erts/emulator/beam/erl_alloc.types erts/emulator/beam/erl_bif_info.c erts/emulator/beam/erl_bif_port.c erts/emulator/beam/erl_bif_trace.c erts/emulator/beam/erl_init.c erts/emulator/beam/erl_message.c erts/emulator/beam/erl_port_task.c erts/emulator/beam/erl_process.c erts/emulator/beam/erl_process.h erts/emulator/beam/erl_process_lock.c erts/emulator/beam/erl_trace.c erts/emulator/beam/export.h erts/emulator/beam/global.h erts/emulator/beam/io.c erts/emulator/sys/unix/sys.c erts/emulator/sys/vxworks/sys.c erts/emulator/test/port_SUITE.erl erts/etc/unix/cerl.src erts/preloaded/ebin/erlang.beam erts/preloaded/ebin/prim_inet.beam erts/preloaded/src/prim_inet.erl lib/hipe/cerl/erl_bif_types.erl lib/kernel/doc/src/inet.xml lib/kernel/src/inet.erl
2012-12-07Implement true asynchronous signaling between processes and portsRickard Green
2012-12-03Improve configuration of process and port tablesRickard Green
2012-10-24Merge branch 'maint'Björn-Egil Dahlberg
Conflicts: erts/etc/common/heart.c
2012-10-18doc: Document ERL_CRASH_DUMP_SECONDS behaviourBjörn-Egil Dahlberg
* heart reboot behaviour * erl_crash.dump file write behaviour
2012-08-31Merge branch 'maint'Björn-Egil Dahlberg
Conflicts: lib/diameter/autoconf/vxworks/sed.general xcomp/README.md
2012-08-31Update copyright yearsBjörn-Egil Dahlberg
2012-08-20Merge branch 'maint'Patrik Nyblom
Conflicts: erts/doc/src/erlang.xml erts/preloaded/ebin/init.beam lib/kernel/doc/src/os.xml lib/stdlib/test/filename_SUITE.erl
2012-08-14Add documetation about Unicode in environmentPatrik Nyblom
2012-06-04Merge branch 'maint'Lukas Larsson
* maint: Remove stale code for hybrid heap and incremental GC Remove the hipe_bifs:show_message_area/0 BIF Remove support for erlang:system_info(global_heaps_size) Remove the erlang:garbage_collect_message_area/0 BIF Remove workarounds for hybrid and shared heaps in test suites Conflicts: erts/doc/src/erlang.xml erts/emulator/beam/erl_message.c erts/emulator/beam/erl_process.c erts/emulator/beam/erl_process.h erts/emulator/hipe/hipe_bif2.tab lib/hipe/cerl/erl_bif_types.erl
2012-05-10Remove stale code for hybrid heap and incremental GCBjörn Gustavsson
The hybrid heap emulator was last working in the non-SMP R11B run-time system. When the constant pools were introduced in R12B, the hybrid heap emulator was not updated to handle them. At this point, the harm from reduced readability of the code is greater than any potential usefulness of keeping the code.
2012-04-27Merge branch 'maint'Sverker Eriksson
Conflicts: erts/emulator/beam/erl_process.c
2012-04-25Merge branch 'rickard/sched-busy-wait/OTP-10044' into maint-r15Erlang/OTP
* rickard/sched-busy-wait/OTP-10044: Add switch controlling scheduler busy wait Conflicts: erts/emulator/beam/erl_process.c erts/emulator/beam/erl_process.h
2012-04-23Merge branch 'rickard/sched-wakeup-other/OTP-10033' into ↵Rickard Green
rickard/sched-wakeup-other-r15b01/OTP-10033 Conflicts: erts/emulator/beam/erl_process.c erts/vsn.mk
2012-04-23Add switch controlling scheduler busy waitRickard Green
2012-04-23Implement proposal for new scheduler wakeup strategyRickard Green
2012-04-16Optimize process table accessRickard Green
2011-12-05Fix typos in erl(1)Tuncer Ayaz
2011-12-01Merge branch 'rickard/deprecate-runtime-binding/OTP-9749'Rickard Green
* rickard/deprecate-runtime-binding/OTP-9749: Deprecate erlang:system_flag/2 arguments scheduler_bind_type and cpu_topology
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