Hi Vinay, I'd be interested in your reesults with 8.1.1 and also with BoneCp. Would you keep me in mind to inform me of your results?
Thanks, Jeff Sent from my iPad On Feb 29, 2012, at 4:44 PM, Vinay Pothnis <[email protected]> wrote: > Yes - I am using DBCP for the connection pool. > BoneCP looks quite interesting! Definitely worth checking out - will do after > I try out with 8.1.1 > > Thanks! > Vinay > > On Wed, Feb 29, 2012 at 1:38 PM, Joakim Erdfelt <[email protected]> wrote: > Also, are your hibernate -> jdbc connections to the db served by a connection > pool? > > We've had many positive reports on using bonecp (over c3po) for that purpose. > > -- > Joakim Erdfelt > [email protected] > > http://webtide.com | http://intalio.com > (the people behind jetty and cometd) > > > > On Wed, Feb 29, 2012 at 2:30 PM, Vinay Pothnis <[email protected]> > wrote: > Thanks for the response Jaokim! > I will give that a try. > > -Thanks > Vinay > > > On Wed, Feb 29, 2012 at 1:24 PM, Joakim Erdfelt <[email protected]> wrote: > Could you try 8.1.1? > It's had some significant updates with regards to nio. > > http://repo1.maven.org/maven2/org/eclipse/jetty/jetty-distribution/8.1.1.v20120215/ > > Usually something like the behavior you describe would trigger me asking > about your GC setup, but I can see that's configured / tweaked quite well. > > -- > Joakim Erdfelt > [email protected] > > http://webtide.com | http://intalio.com > (the people behind jetty and cometd) > > > > On Wed, Feb 29, 2012 at 2:17 PM, Vinay Pothnis <[email protected]> > wrote: > Hello, > > I am seeing a periodic CPU spike when the Jetty server is handling requests. > The spike occurs regularly every 5 minutes and uses up 90-100% CPU for a > short duration. > The CPU utilization falls back to normal after that short spike. This happens > only when the server is receiving requests. > > I have taken thread dumps during several spikes and I have not been able to > conclude anything concrete. In the dumps I observed the following: > > 1. There were hundreds of threads in BLOCKED state waiting for a lock held by > a thread. > 2. The thread that was holding the lock was in turn BLOCKED. But it was not > waiting for any other lock. Example shown below. > "qtp732533575-307956" prio=10 tid=0x00002aad980c4800 nid=0x3e1f waiting for > monitor entry [0x0000000067f69000] > java.lang.Thread.State: BLOCKED (on object monitor) > at org.hibernate.util.SoftLimitMRUCache.get(SoftLimitMRUCache.java:74) > - locked <0x00002aabefafa198> (a org.hibernate.util.SoftLimitMRUCache) > at > org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:88) > at > org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156) > at > org.hibernate.impl.AbstractSessionImpl.getNamedQuery(AbstractSessionImpl.java:82) > at org.hibernate.impl.SessionImpl.getNamedQuery(SessionImpl.java:1287) > at sun.reflect.GeneratedMethodAccessor202.invoke(Unknown Source) > 3. The actual lock that the threads were waiting on, varied. It was not the > same in the different spikes every 5 minutes. > > Environment Details: > * Embedded Jetty Version 8.0.4 > * Java 1.6.0_17 > * Red Hat Enterprise Linux Server release 5.2 (Tikanga) > > JVM Parameters: > -server -Xmx11g -Xms11g -XX:MaxPermSize=256m -XX:+UseParNewGC > -XX:+UseConcMarkSweepGC -XX:NewSize=5g -XX:MaxNewSize=5g -XX:SurvivorRatio=6 > -XX:+PrintGCDetails -XX:+PrintGCTimeStamps > -Dsun.rmi.dgc.client.gcInterval=3600000 > -Dsun.rmi.dgc.server.gcInterval=3600000 > > I have also attached the CPU usage pattern. Any pointers would be greatly > appreciated. > > Thanks! > Vinay > > _______________________________________________ > jetty-users mailing list > [email protected] > https://dev.eclipse.org/mailman/listinfo/jetty-users > > > > _______________________________________________ > jetty-users mailing list > [email protected] > https://dev.eclipse.org/mailman/listinfo/jetty-users > > > > _______________________________________________ > jetty-users mailing list > [email protected] > https://dev.eclipse.org/mailman/listinfo/jetty-users > > > > _______________________________________________ > jetty-users mailing list > [email protected] > https://dev.eclipse.org/mailman/listinfo/jetty-users > > > _______________________________________________ > jetty-users mailing list > [email protected] > https://dev.eclipse.org/mailman/listinfo/jetty-users
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