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Hi Joe,<br>
<br>
Thanks for correcting me.<br>
This image indeed proves your point:<br>
<a class="moz-txt-link-freetext" href="http://java.sun.com/docs/hotspot/gc5.0/fig4.gif">http://java.sun.com/docs/hotspot/gc5.0/fig4.gif</a><br>
As well as this thread:<br>
<a class="moz-txt-link-freetext" href="http://www.velocityreviews.com/forums/t683307-question-on-xms-xmx-and-xx-maxpermsize-in-jvm-start-parameter.html">http://www.velocityreviews.com/forums/t683307-question-on-xms-xmx-and-xx-maxpermsize-in-jvm-start-parameter.html</a><br>
<br>
Very interesting, I had it wrong for years.<br>
<br>
Op 09-02-12 13:27, Joe Ammann schreef:
<blockquote cite="mid:4F33BB94.5000400@pyx.ch" type="cite">
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On 02/09/2012 09:34 AM, Geoffrey De Smet wrote:
<blockquote cite="mid:jh00e5$6v6$1@dough.gmane.org" type="cite">
<pre wrap="">The perm gen space is a subset of the heap space.
So it doesn't make sense to put them on the same value.
Try this instead:
-Xmx1024m -XX:MaxPermSize=512m
Or, if that fails:
-Xmx2048m -XX:MaxPermSize=1024m
</pre>
</blockquote>
Sorry to disagree Geoffrey, but PermGen is NOT a part of heap in
all (Sun) JVM's that I'm aware of. See<br>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://stackoverflow.com/questions/2129044/java-heap-terminology-young-old-and-permanent-generations">http://stackoverflow.com/questions/2129044/java-heap-terminology-young-old-and-permanent-generations</a><br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://www.oracle.com/technetwork/java/gc-tuning-5-138395.html">http://www.oracle.com/technetwork/java/gc-tuning-5-138395.html</a>
(the picture a few pages down)<br>
<br>
So the sizes are specified separately. But having a MaxPerm of 1G
and STILL see PermGen OOM is strange.<br>
<br>
The problem could be, that when using the CMS (concurrent mark
sweep) GC, PermGen is not collected. I have seen cases where
sooner or later OOM PermGen errors happened consistently, until we
added <br>
<br>
<code>-XX:+CMSPermGenSweepingEnabled</code><br>
<pre class="moz-signature" cols="72">--
CU, Joe</pre>
<pre wrap="">
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</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
With kind regards,
Geoffrey De Smet</pre>
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