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From "Vasanth Kumar ravi" <josvasa...@gmail.com>
Subject Question on Performance Tuning
Date Wed, 19 Nov 2008 02:42:35 GMT
Folks,
I have some queries related to the performance tuning of Tomcat V6.
I did search some search on the internet and found very little with regards
to tuning.
My application setup is as follows.

2 Apache web servers.
4 Tomcat application servers
2 database servers.
We did many rounds of load/performance testing with 50 Virtual users, to
find bottlenecks with the application, major problem found was CPU
utilization.

1. We did load testing with 1 apache and 1 tomcat, the CPU was arnd 70%
2. We did load testing with 2 apache and 2 tomcat, the CPU was arnd 70%
3.We did load testing with 2 apache and 3 tomcat, the CPU was arnd 70%
4.We did load testing with 2 apache and 4 tomcat, the CPU was arnd 70%

Each tomcat has a heap size of min/max = 2 GB.

JAVA_OPTS="$JAVA_OPTS "-Xms2048m" "-Xmx2048m"  "-XX:MaxPermSize=128m"
"-XX:PermSize=128m" "-XX:NewRatio=3" "-XX:NewSize=256m"
"-XX:MaxNewSize=256m" "-XX:SurvivorRatio=6" "-XX:+UseConcMarkSweepGC"
"-XX:+PrintGCDetails" "-XX:+PrintGCTimeStamps" "-XX:+DisableExplicitGC"
"-Xloggc:logs/gc.log" "-Denv=beesptesxapp14" "-Denvironment=etestqa"
"-Dorg.xml.sax.driver=org.apache.xerces.parsers.SAXParser"
"-Djavax.xml.parsers.SAXParserFactory=org.apache.xerces.jaxp.SAXParserFactoryImpl"
"-Dinstance=homepage_beesptesxapp14"
"-javaagent:/opt/shared/applications/homepage/lib/aspectjweaver-1.5.3.jar
We did take thread dumps while performing the test, and found nothing
related to application bottlenecks.

Can I get some pointers on anything to be tuned in the tomcat to reduce the
cpu utilization.

Thanks.
-- 
Regards&Thanks,
Vasanth Kumar Ravi

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