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From liang xie <xieliang...@gmail.com>
Subject Re: JVM tuning
Date Mon, 29 Nov 2010 08:59:41 GMT
It's not correct : "starting with
JDK version 1.5, on server-class machines, VM automatically chooses CMS as
the collector for the old generation."

In deed, the default GC mode for old generation is Parallel GC in JDK6,  you
need to specify "-XX:UseConcMarkSweepGC" for CMS mode explicitly : )

2010/11/29 vineeta vashistha <vineeta.vashistha@appulse.com>

> Liang,
>
> Java technology-based applications can be instructed to run with CMS for
> the
> old generation by specifying -XX:UseConcMarkSweepGC. However, starting with
> JDK version 1.5, on server-class machines, VM automatically chooses CMS as
> the collector for the old generation.
>
> Please refer the following link.
>
> *http://www.sun.com/bigadmin/content/submitted/cms_gc_logs.jsp*<
> http://www.sun.com/bigadmin/content/submitted/cms_gc_logs.jsp>
>
> Regards,
> Vineeta
>
> On Mon, Nov 29, 2010 at 6:23 AM, liang xie <xieliang007@gmail.com> wrote:
>
> > Try CMS GC mode
> >
> > 2010/11/26 vineeta vashistha <vineeta.vashistha@appulse.com>
> >
> > > I am using jdk.1.6
> > > My System is getting paused for 5 minutes at the time of GC.
> > >
> > > Please suggest some settings so that system doesn't pause for such a
> long
> > > duration.
> > >
> > > Regards,
> > > Vineeta
> > >
> >
>

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