Long ParNew Collection Time

[Shay Banon]

I will give it a go. Are you suggesting that its just a time reporting problem, and there is no actual long GC? It does correlate with the system hanging and not doing anything during that time (not responding to any requests from clients).


-shay.banon



On Tuesday, January 11, 2011 at 9:40 AM, Y. Srinivas Ramakrishna wrote:

> Is the system TOD being changed? May be an overzealous NTP daemon?
> Can you make sure NTP is disabled and see if the problem goes away?
> 
> -- ramki
> 
> 
> On 1/10/2011 10:30 PM, Shay Banon wrote:
> 
> > Hi,
> > 
> > 
> > Running a JVM (1.6u23) on ubuntu 10.0 (machine has 32gb) getting this GC log output:
> > 
> > 
> > 3856.471: [GC 3856.471: [ParNew: 118016K->13056K(118016K), 37.8958700 secs] 689035K->593566K(8375552K), 37.8959970 secs] [Times: user=0.00 sys=0.00, real=37.90 secs]
> > 
> > 
> > As you can see, the it seems like time wise, its all real.
> > 
> > 
> > Flags used are:
> > 
> > 
> > -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -Xms8g -Xmx8g
> > 
> > 
> > Tried also with:
> > 
> > 
> > * -XX:SurvivorRatio=8 -XX:MaxTenuringThreshold=1 -XX:CMSInitiatingOccupancyFraction=75
> > * -XX:-CMSConcurrentMTEnabled
> > 
> > 
> > Checked vmstat during the run, and don't see any swapping going on (si/so are 0, no swap).
> > 
> > 
> > Any idea on how to try and solve this?
> > 
> > 
> > cheers,
> > -shay.banon
> > 
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
> > hotspot-gc-use mailing list
> > hotspot-gc-use at openjdk.java.net
> > http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use
> > 
> > 
> 
> 
> 




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