[jboss-user] [Performance Tuning] - Server Hangs, Optimization issues

Karthikeyan Duraisamy do-not-reply at jboss.com
Tue May 14 05:05:38 EDT 2013

Karthikeyan Duraisamy [https://community.jboss.org/people/karthykn] created the discussion

"Server Hangs, Optimization issues"

To view the discussion, visit: https://community.jboss.org/message/817573#817573


I am quiet new here. forgive if my questions are dump.

We are having a problem on JBoss(Version: 5.0.0.CR2) server running with Jrockit(Version :build R27.6.5-32_o-121899-1.6.0_14-20091001-2107-windows-ia32)
The server hang frequently.

was trying to optimize the JVM settings.

Initial JVM setting was : *set JAVA_OPTS=%JAVA_OPTS% -Xms768m -Xmx1024m -XX:MaxPermSize=256m*

Later have chaged to 

*set JAVA_OPTS=%JAVA_OPTS% -Xms1024m -Xmx1024m -Xns512m -XXkeepAreaRatio=3 -XXsetGC:genparcon -XXcompactSetLimit:10200 -Xverbose:gc -Xverboselog:jbossVerboseLog.txt*

But getting some page fault errors as shown below,
+[INFO ][memory ] Warning: Your computer has generated 31142 page faults during the last garbage collection.+
+[INFO ][memory ] If you find this swapping problematic, please consider running JRockit with a smaller heap.+

After few hours it started  Throwing OutOfMemory: allocLargeObjectOrArray

So I included the XXtlaSize in jvm settings,

*set JAVA_OPTS=%JAVA_OPTS% -Xms1024m -Xmx1024m -Xns512m -XXlargeObjectLimit=70k -XXtlaSize=70k -XXminBlockSize=96k -XXkeepAreaRatio=3 -XXsetGC:genparcon -XXcompactSetLimit:10200  -Xverbose:gc -Xverboselog:jbossVerboseLog.txt*

But server become very unstable, server restarted automatically.

Now we revert all the changes to initial settings.

I have attached verbose log. Please suggest me in case if i need to look into something else.

Thanks in advance.

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