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Justin,<br>
<br>
This alias is mainly for Openjdk issues and that would currently be<br>
jdk7. For help with tuning jdk5, check with your Sun/Oracle<br>
support contacts. They should be able to give you good tuning<br>
advice on jdk5.<br>
<br>
Jon<br>
<br>
On 7/12/10 8:29 AM, Justin Ellison wrote:
<blockquote
cite="mid:AANLkTinryXnzDuned_u-H8ysAhaL3aEWRPhywrcALxKC@mail.gmail.com"
type="cite">Hello everyone,<br>
<br>
We've recently upgraded our Weblogic webapp to Weblogic 9.2.1 which
also involved upgrading from jdk 1.4.2 to 1.5.0_22. Java 6 isn't an
option with Weblogic 9.2, and the upgrade to Weblogic 10 isn't until
next year, so Java 6 is not an option for me at this point in time.<br>
<br>
I had the 1.4.2 tuned to the extreme:<br>
<pre>JAVA_ARGS=-Xms2816m -Xmx2816m -XX:NewSize=384m -XX:MaxNewSize=384m -XX:CompileThreshold=3000 -Djava.net.setSoTimeout=20000 \
-XX:LargePageSizeInBytes=4m -XX:+UseMPSS -Xss128k -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSParallelRemarkEnabled \
-Xnoclassgc -XX:ParallelGCThreads=4 -XX:MaxTenuringThreshold=8 -XX:SurvivorRatio=6 -XX:+UseCMSCompactAtFullCollection -Xloggc:gc.out \
-verbose:gc -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -XX:MaxPermSize=92m</pre>
With our upgrade, the ergonomics of the application changed some, so I
just specified Xmx and Xms at 3GB, and let it run to see what
happened. Remarkably, things were actually pretty good - minor GC's
are faster, and major GC's only occur about once or twice an hour.
However, those major GC's are taking from 12-20seconds, which I can't
let our website users endure.<br>
<br>
Before I go down the road of tuning things, does anyone have any tips
for me? I can afford at most 2 or 3 seconds of pause time at once, and
would prefer to keep it under 2 seconds if possible. I need the 2GB of
tenured to be able to cache all the objects that I need to ensure good
site performance.<br>
<br>
The ergonomics look kinda cool, but I'm wondering if that large of
tenured generation + my low pause requirement is just too much to ask
from the throughput collector. Am I destined to go back to hand
tweaking the CMS collector?<br>
<br>
Justin<br>
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