regarding sudden memory increase

[Srinivas Ramakrishna]

Also, please use -XX:+PrintGCDetails for more detail on what's happening.
If there's a crash there would usually be an hs_error log file in your $CWD
which might tell you what may have caused the crash.

-- ramki

On Fri, Feb 17, 2012 at 8:38 AM, Paul Hohensee <paul.hohensee at oracle.com>wrote:

>  Your question would be better answered by someone on the hotstpot-gc-use
> list, cc'ed.
>
> You don't mention which version of the JDK you're using, but you should be
> using the latest update of JDK 7, which is update 2.
>
> Paul
>
> On 2/17/12 10:54 AM, sakthivel wrote:
>
>   Dear Sir,
>            I have the following setting for my system
>
> -Xms1536M
> -Xmx1536M
> -verbose:gc
> -XX:+PrintGCDateStamps
> -XX:NewSize=768M
> -XX:MaxNewSize=768M
> -XX:PermSize=256m
> -XX:MaxPermSize=256m
> -XX:+CMSClassUnloadingEnabled
> -XX:+UseConcMarkSweepGC
> -XX:+CMSIncrementalMode
> -XX:+DisableExplicitGC
> -XX:+ExplicitGCInvokesConcurrent
> -XX:GCTimeRatio=19
> -Xincgc
> -XX:SurvivorRatio=2
> -XX:MaxTenuringThreshold=50
> -XX:MaxGCPauseMillis=12000
>
> and My logs as below
>
> 2012-02-16T09:53:47.907-0500: [GC 462167K->82462K(1376256K), 0.0554103
> secs]
> 2012-02-16T09:53:52.275-0500: [GC 475678K->68672K(1376256K), 0.0541640
> secs]
> 2012-02-16T09:53:53.289-0500: [GC 461888K->68574K(1376256K), 0.0539152
> secs]
> 2012-02-16T09:53:56.471-0500: [GC 461790K->68683K(1376256K), 0.0556297
> secs]
> 2012-02-16T09:53:58.281-0500: [GC 461899K->95837K(1376256K), 0.0757101
> secs]
>
> in certain case the tomcat memory increases as follows
>
> 2012-02-16T12:02:32.182-0500: [GC 454346K->97556K(1376256K), 0.1354231
> secs]
> 2012-02-16T12:03:30.542-0500: [GC 490772K->128467K(1376256K), 0.2537510
> secs]
> 2012-02-16T12:04:28.792-0500: [GC 521683K->223446K(1376256K), 0.3725598
> secs]
> 2012-02-16T12:05:14.235-0500: [GC 616662K->265305K(1376256K), 0.3163817
> secs]
> 2012-02-16T12:05:20.459-0500: [GC 452169K(1376256K), 0.2202838 secs]
> 2012-02-16T12:05:26.949-0500: [GC 658521K->253437K(1376256K), 0.2352744
> secs]
> 2012-02-16T12:05:48.524-0500: [GC 468368K(1376256K), 0.1812084 secs]
>
> and tomcat crashes, please help in this regard
>
> Thanks,
> Sakthi
>
>
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>
>
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