Did any of those suggestions with NewGen, Thread Cores or Low Pause GC help?
Regards, Carl.
> Hi everyone,
>
> thanks for all the good feedback.
>
> Let me first tell you WHY I think its a JVM issue, then show you what
> results I have had.
>
> We took the exact same code, and connected it to the exact same DB
> (and DB
> server) and ran the exact same code in isolation. The comparison was
> outstanding about 2s on the old machine and 10s as you have seen on
> the new.
>
>
> The connection between the SQL and both web machines pinged at <1ms
>
> We tried the connection from various locations and ruled out network
> issues
> (although there could be ). We looked at execution times and logged
> the
> information pretty heavily in the intensive parts of the app and saw
> that,
> on comparison between machines the differences. Given that, and the
> isolation tests, the only thing we could see that was different was
> the JVM
> settings, thus the conclusion we came too.
>
> so having taken some of the suggestions into account I have ended up
> with
> this setting:
>
> java.args=-server -Xms4096m -Xmx8192m -Dsun.io.useCanonCaches=false
> -XX:PermSize=1024m -XX:MaxPermSize=1024m
> -Dsun.rmi.dgc.client.gcInterval=150000
> -Dsun.rmi.dgc.server.gcInterval=150000 -XX:+UseParallelGC -Xbatch
> -Dcoldfusion.rootDir={application.home}/
> -Djava.security.policy={application.
home}/> servers/cfusion/cfusion-ear/cfusion-war/WEB-INF/cfusion/lib/coldfusion.
> policy
> -Djava.security.auth.policy={application.
home> }/servers/cfusion/cfusion-ear/cfusion-war/WEB-INF/cfusion/lib/neo_jaas.
> policy
>
> This puts us at an execution time parallel to the old 32 bit machine,
> down
> at 1.5-2 seconds. while this is a vast improvement I would hope that
> more
> gains could be had out of tuning the JVM some more. I will tweak the
> GCinterval and the permSize tomorrow night and see if there is an
> incremental gain to be had.
>
> Any other suggestions would be great!
>
> Thanks.
>
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