The image did not get through. Can you zip it?
Paul
"Al Forbes"
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"JCS Users List"
12/04/2006 11:29 <jcs-users@jakarta.apache.org>
AM cc
Subject
Please respond to Re: Garbage collection
"JCS Users List"
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Thanks Paul. Yes, I already use those params - I think they will be
the defaults in JDK1.6, but still need setting in pre-JDK 1.6.
I will try changing from a disk cache to Mysql just so I can narrow
down the problem.
Not sure if the attached image will get through, but this shows what
is happening.
Regards
Al
On 04/12/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> We ran into similar issues when first starting to use JCS. The
underlying
> issue for us was that the remote cache uses RMI calls. When RMI is in
use,
> the JVM may automatically trigger full GC's every 60 seconds as the
> default; at least under our JDK 1.3.1...not sure about JDK 1.5 but I
> believe they may have changed this to the values I will list below in the
> JVM parameters that we added...you can tell by examining the GC
consecutive
> cycles...if they are exactly 60 seconds apart, every 60 seconds, then if
> you add the parameters below you may see an improvement:
>
> -Dsun.rmi.dgc.client.gcInterval=3600000
> -Dsun.rmi.dgc.server.gcInterval=3600000
> -Dsun.rmi.transport.tcp.connectionPool=true
>
> Hope this helps.
>
> Paul
>
>
>
>
>
> "Al Forbes"
> <[EMAIL PROTECTED]
> mail.com>
To
> jcs-users@jakarta.apache.org
> 12/03/2006 04:30
cc
> PM
>
Subject
> Garbage collection
> Please respond to
> "JCS Users List"
> <[EMAIL PROTECTED]
> a.apache.org>
>
>
>
>
>
>
> Hi,
>
> I have a remote cache setup with a memory+disk cache, pure memory, and
> a mysql cache (0 memory). This uses the latest JCS jcs-1.2.7.9.2.jar
> in JDK1.5.
>
>
> After starting the times for a "Full" grabage collection get longer
> and longer. Eventually after about 10-12 days I need to restart the
> remote cache. Also when the full garbage collection runs it uses more
> and more CPU. Memory usage remains fairly constant (round 600M), and
> the incremental collections are fairly small 0.02 secs. I wonder if
> anyone these has seen the same thing, or has any better suggestions
> for the garbage collection.
>
> Full collection:
> 559228.304: [Full GC 559228.304: [CMS: 214224K->171110K(393216K),
> 1.2718260 secs] 328232K->171110K(524224K), [CMS Perm :
> 8565K->8540K(16384K)] icms_dc=0 , 1.2720400 secs]
>
> I currently have the garbage collection configured to:
>
> MEMUSE="-Xms512m -Xmx1024m"
> MEMUSE=" $MEMUSE -XX:+UseConcMarkSweepGC \
> -XX:NewSize=128m -XX:MaxNewSize=128m \
> -XX:+CMSIncrementalMode \
> -XX:+CMSIncrementalPacing \
> -XX:CMSIncrementalDutyCycleMin=0 \
> -XX:CMSIncrementalDutyCycle=10 \
> -XX:+PrintGCDetails \
> -XX:+PrintGCTimeStamps \
> -Xloggc:../logs/gc.log \
> -XX:-TraceClassUnloading"
>
> Regards
> Al
>
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