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authorRickard Green <[email protected]>2014-01-28 15:53:03 +0100
committerRickard Green <[email protected]>2014-01-28 15:53:03 +0100
commit3c112fbde20a21db0cafc140aa72346f60315b90 (patch)
tree9355dc94fae68ce2b1d9d08ca0a23484c8c59dfe /erts/doc/src/erl.xml
parentf65764907faba7ea6ca1a6bb266b6c6612e06b7b (diff)
parentc1c03ae4ee50e58b7669ea88ec4d29c6b2b67c7b (diff)
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Merge branch 'vinoski/ds'
* vinoski/ds: initial support for dirty schedulers and dirty NIFs
Diffstat (limited to 'erts/doc/src/erl.xml')
-rw-r--r--erts/doc/src/erl.xml48
1 files changed, 48 insertions, 0 deletions
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index e737727941..27a23174d5 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -792,6 +792,54 @@
SMP support enabled (see the <seealso marker="#smp">-smp</seealso>
flag).</p>
</item>
+ <tag><marker id="+SDcpu"><c><![CDATA[+SDcpu DirtyCPUSchedulers:DirtyCPUSchedulersOnline]]></c></marker></tag>
+ <item>
+ <p>Sets the number of dirty CPU scheduler threads to create and dirty
+ CPU scheduler threads to set online when threading support has been
+ enabled. The maximum for both values is 1024, and each value is further
+ limited by the settings for normal schedulers: the number of dirty CPU
+ scheduler threads created cannot exceed the number of normal scheduler
+ threads created, and the number of dirty CPU scheduler threads online
+ cannot exceed the number of normal scheduler threads online (see the
+ <seealso marker="#+S">+S</seealso> and <seealso marker="#+SP">+SP</seealso>
+ flags for more details). By default, the number of dirty CPU scheduler
+ threads created equals the number of normal scheduler threads created,
+ and the number of dirty CPU scheduler threads online equals the number
+ of normal scheduler threads online. <c>DirtyCPUSchedulers</c> may be
+ omitted if <c>:DirtyCPUSchedulersOnline</c> is not and vice versa. The
+ number of dirty CPU schedulers online can be changed at run time via
+ <seealso marker="erlang#system_flag_dirty_cpu_schedulers_online">erlang:system_flag(dirty_cpu_schedulers_online, DirtyCPUSchedulersOnline)</seealso>.
+ </p>
+ <p>This option is ignored if the emulator doesn't have threading support
+ enabled. Currently, <em>this option is experimental</em> and is supported only
+ if the emulator was configured and built with support for dirty schedulers
+ enabled (it's disabled by default).
+ </p>
+ </item>
+ <tag><marker id="+SDPcpu"><c><![CDATA[+SDPcpu DirtyCPUSchedulersPercentage:DirtyCPUSchedulersOnlinePercentage]]></c></marker></tag>
+ <item>
+ <p>Similar to <seealso marker="#+SDcpu">+SDcpu</seealso> but uses percentages to set the
+ number of dirty CPU scheduler threads to create and number of dirty CPU scheduler threads
+ to set online when threading support has been enabled. Specified values must be greater
+ than 0. For example, <c>+SDPcpu 50:25</c> sets the number of dirty CPU scheduler threads
+ to 50% of the logical processors configured and the number of dirty CPU scheduler threads
+ online to 25% of the logical processors available. <c>DirtyCPUSchedulersPercentage</c> may
+ be omitted if <c>:DirtyCPUSchedulersOnlinePercentage</c> is not and vice versa. The
+ number of dirty CPU schedulers online can be changed at run time via
+ <seealso marker="erlang#system_flag_dirty_cpu_schedulers_online">erlang:system_flag(dirty_cpu_schedulers_online, DirtyCPUSchedulersOnline)</seealso>.
+ </p>
+ <p>This option interacts with <seealso marker="#+SDcpu">+SDcpu</seealso> settings.
+ For example, on a system with 8 logical cores configured and 8 logical cores available,
+ the combination of the options <c>+SDcpu 4:4 +SDPcpu 50:25</c> (in either order) results
+ in 2 dirty CPU scheduler threads (50% of 4) and 1 dirty CPU scheduler thread online (25% of 4).
+ </p>
+ <p>This option is ignored if the emulator doesn't have threading support
+ enabled. Currently, <em>this option is experimental</em> and is supported only
+ if the emulator was configured and built with support for dirty schedulers
+ enabled (it's disabled by default).
+ </p>
+ </item>
+ <tag><marker id="+SDio"><c><![CDATA[+SDio IOSchedulers]]></c></marker></tag>
<tag><c><![CDATA[+sFlag Value]]></c></tag>
<item>
<p>Scheduling specific flags.</p>