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authorRickard Green <[email protected]>2014-08-26 17:26:31 +0200
committerRickard Green <[email protected]>2014-09-25 16:42:20 +0200
commit6084a42a24fca52a5de2bc487c0cd2be46dcc21f (patch)
tree63fe33c074ccce7dd8bf51e846b9b778b81e4af5 /erts/doc
parent65e335e255cb76d979f605ed34700e4e02041139 (diff)
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Introduce support for eager check I/O scheduling
Diffstat (limited to 'erts/doc')
-rw-r--r--erts/doc/src/erl.xml17
-rw-r--r--erts/doc/src/erlang.xml11
2 files changed, 28 insertions, 0 deletions
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index 528a2d95aa..967226056e 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -1065,6 +1065,23 @@
<p>For more information, see
<seealso marker="erlang#system_info_cpu_topology">erlang:system_info(cpu_topology)</seealso>.</p>
</item>
+ <tag><marker id="+secio"><c>+secio true|false</c></marker></tag>
+ <item>
+ <p>Enable or disable eager check I/O scheduling. The default
+ is currently <c>false</c>, but will most likely be changed
+ to <c>true</c> in OTP 18. The behaviour before this flag
+ was introduced corresponds to <c>+secio false</c>.</p>
+ <p>The flag effects when schedulers will check for I/O
+ operations possible to execute, and when such I/O operations
+ will execute. As the name of the parameter implies,
+ schedulers will be more eager to check for I/O when
+ <c>true</c> is passed. This however also implies that
+ execution of outstanding I/O operation will not be
+ prioritized to the same extent as when <c>false</c> is
+ passed.</p>
+ <p><seealso marker="erlang#system_info_eager_check_io"><c>erlang:system_info(eager_check_io)</c></seealso>
+ returns the value of this parameter used when starting the VM.</p>
+ </item>
<tag><marker id="+sfwi"><c>+sfwi Interval</c></marker></tag>
<item>
<p>Set scheduler forced wakeup interval. All run queues will
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index e3ef48a6c1..e02e4cbbc9 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -5611,6 +5611,7 @@ ok
<name name="system_info" arity="1" clause_i="52"/>
<name name="system_info" arity="1" clause_i="53"/>
<name name="system_info" arity="1" clause_i="54"/>
+ <name name="system_info" arity="1" clause_i="55"/>
<fsummary>Information about the system</fsummary>
<desc>
<p>Returns various information about the current system
@@ -5740,6 +5741,16 @@ ok
The return value will always be <c>false</c> since
the elib_malloc allocator has been removed.</p>
</item>
+ <tag><marker id="system_info_eager_check_io"><c>eager_check_io</c></marker></tag>
+ <item>
+ <p>
+ Returns the value of the <c>erl</c>
+ <seealso marker="erl#+secio">+secio</seealso> command line
+ flag which is either <c>true</c> or <c>false</c>. See the
+ documentation of the command line flag for information about
+ the different values.
+ </p>
+ </item>
<tag><c>ets_limit</c></tag>
<item>
<p>Returns the maximum number of ETS tables allowed. This limit