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authorDan Gudmundsson <[email protected]>2012-01-25 15:44:16 +0100
committerDan Gudmundsson <[email protected]>2012-02-06 15:00:34 +0100
commit6992261d258f2fc0b25ddf99ebcbf66ae02f5df8 (patch)
tree47aa7dc8a740c037bc505e822480ec0883375a6b /erts/doc/src
parentd39e5702b224592bc79cc3ca122dcb0b59162d7f (diff)
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emulator: Document and test scheduler_wall_time
Diffstat (limited to 'erts/doc/src')
-rw-r--r--erts/doc/src/erlang.xml26
1 files changed, 25 insertions, 1 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index a603d5c2b8..f2b95678b9 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -4,7 +4,7 @@
<erlref>
<header>
<copyright>
- <year>1996</year><year>2011</year>
+ <year>1996</year><year>2012</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
@@ -4933,6 +4933,21 @@ true</pre>
threads in the Erlang run-time system and may therefore be greater
than the wall-clock time.</p>
</item>
+ <tag><marker id="statistics_scheduler_wall_time"><c>scheduler_wall_time</c></marker></tag>
+ <item>
+ <p>Returns
+ <c>[{Scheduler_Id, Scheduler_Worked_Time, Scheduler_Total_Time}]</c>, time lapses are since the
+ the system flag <seealso marker="#system_flag_scheduler_wall_time">scheduler_wall_time</seealso>
+ was set to true.
+ Returns <c>undefined</c> if the system flag <seealso marker="#system_flag_scheduler_wall_time">
+ scheduler_wall_time</seealso> is set to false.
+ </p>
+ <p>The list of scheduler information is unsorted and may come in different order
+ between calls. The time unit is undefined and may be changed and should only be used
+ to calculate relative utilization.
+ </p>
+ </item>
+
<tag><c>wall_clock</c></tag>
<item>
<p>Returns
@@ -5305,6 +5320,14 @@ true</pre>
flags.
</p>
</item>
+ <tag><marker id="system_flag_scheduler_wall_time"><c>erlang:system_flag(scheduler_wall_time, Boolean)</c></marker></tag>
+ <item>
+ <p>Turns on/off scheduler wall time measurements. </p>
+ <p>For more information see,
+ <seealso marker="#statistics_scheduler_wall_time">erlang:statistics(scheduler_wall_time)</seealso>.
+ </p>
+ </item>
+
<tag><marker id="system_flag_schedulers_online"><c>erlang:system_flag(schedulers_online, SchedulersOnline)</c></marker></tag>
<item>
<p>Sets the amount of schedulers online. Valid range is
@@ -5316,6 +5339,7 @@ true</pre>
<seealso marker="#system_info_schedulers_online">erlang:system_info(schedulers_online)</seealso>.
</p>
</item>
+
<tag><c>erlang:system_flag(trace_control_word, TCW)</c></tag>
<item>
<p>Sets the value of the node's trace control word to