From d8e862b5b4a354bdeee2d2b4d6d46024d4aabb0e Mon Sep 17 00:00:00 2001
From: Rickard Green <rickard@erlang.org>
Date: Sat, 4 Sep 2010 00:18:45 +0200
Subject: Add scheduler wakup threshold as command line argument

The scheduler wakeup threshold is now possible to adjust at system boot.
For more information see the `+swt' command line argument of `erl'.
---
 erts/doc/src/erl.xml | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

(limited to 'erts/doc')

diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index f477280a6f..e36d0adb0d 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -831,14 +831,28 @@
 	    <p>For more information, see
 	    <seealso marker="erlang#system_flag_cpu_topology">erlang:system_flag(cpu_topology, CpuTopology)</seealso>.</p>
           </item>
+	  <tag><marker id="+swt"><c>+swt very_low|low|medium|high|very_high</c></marker></tag>
+	  <item>
+             <p>Set scheduler wakeup threshold. Default is <c>medium</c>.
+	        The threshold determines when to wake up sleeping schedulers
+		when more work than can be handled by currently awake schedulers
+		exist. A low threshold will cause earlier wakeups, and a high
+		threshold will cause later wakeups. Early wakeups will
+		distribute work over multiple schedulers faster, but work will
+		more easily bounce between schedulers.
+	     </p>
+             <p><em>NOTE:</em> This flag may be removed or changed at any time
+	        without prior notice.
+	     </p>
+	  </item>
+	  <tag><marker id="sched_thread_stack_size"><c><![CDATA[+sss size]]></c></marker></tag>
+	  <item>
+	    <p>Suggested stack size, in kilowords, for scheduler threads.
+            Valid range is 4-8192 kilowords. The default stack size
+            is OS dependent.</p>
+	  </item>
         </taglist>
       </item>
-      <tag><marker id="sched_thread_stack_size"><c><![CDATA[+sss size]]></c></marker></tag>
-      <item>
-        <p>Suggested stack size, in kilowords, for scheduler threads.
-          Valid range is 4-8192 kilowords. The default stack size
-          is OS dependent.</p>
-      </item>
       <tag><marker id="+t"><c><![CDATA[+t size]]></c></marker></tag>
       <item>
         <p>Set the maximum number of atoms the VM can handle. Default is 1048576.</p>
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