G1GC Old generation taking too much time.

[Monica Beckwith]

Hi Pravin,

I work on G1 GC performance, and would like to look at your log. Please 
feel free to forward it to me at the above 'from' email address. Also, 
please send along your java version string.

Thanks!
Monica Beckwith

On 12/17/2012 1:12 AM, Pravin Sinha wrote:
> Hi,
>
> We are facing a weird problem when G1GC enabled.  The Old Gen 
> collections took about 50 min and the process was completely unresponsive.
> This is what we have in our deployment:
> * Max heap consumption was around 12.5G
> * we had set for JVM:
> -d64 -Xms15360m -Dcom.sun.management.jmxremote 
> -Dcom.sun.management.jmxremote.port=9080 
> -Dcom.sun.management.jmxremote.local.only=false 
> -Dcom.sun.management.jmxremote.authenticate=false 
> -Dcom.sun.management.jmxremote.ssl=false -XX:+UseG1GC 
> -XX:MaxGCPauseMillis=200 -XX:GCPauseIntervalMillis=400  
> -XX:+PrintGCTimeStamps -XX:+PrintGCDetails  -Xloggc:/loc_to_log.
>
> We are running it on a 32 core box and the number of ParellelGC thread 
> is 23 ( I think using 5/8 rule?). Could you please suggest something 
> to try to avoid this long GC time?
>
> Regards,
> Pravin
>
>
>
>
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> hotspot-gc-use at openjdk.java.net
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-- 
Oracle <http://www.oracle.com>
Monica Beckwith | Java Performance Engineer
VOIP: +1 512 401 1274 <tel:+1%20512%20401%201274>
Texas
Green Oracle <http://www.oracle.com/commitment> Oracle is committed to 
developing practices and products that help protect the environment
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