So here is what we ended up with. java.args=-server -Xms4096m -Xmx8192m -Dsun.io.useCanonCaches=false -XX:MaxPermSize=1024m -Dsun.rmi.dgc.client.gcInterval=150000 -Dsun.rmi.dgc.server.gcInterval=150000 -XX:+UseParallelGC -Xbatch
We tried making max and min perm size the same, but for some reason, it really didn't like it. This set up has worked well for 2 + weeks, and now we seem to be at a happy point where the norm is requests under 500ms, with a select few taking 2 seconds. Thanks for all the help. On Wed, Feb 23, 2011 at 5:44 PM, Carl Meyer <[email protected]> wrote: > > 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. > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Order the Adobe Coldfusion Anthology now! http://www.amazon.com/Adobe-Coldfusion-Anthology/dp/1430272155/?tag=houseoffusion Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:342822 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/groups/cf-talk/unsubscribe.cfm
