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From Steve Harris <shar...@myra.com>
Subject RE: Full GC freezes Tomcat
Date Tue, 15 Apr 2003 19:27:57 GMT
Hi,

I think the Sun VM has a -Xincgc option which performacs incremental
garbage collection - may/may not be useful.

Cheers - Steve


On Tue, 15 Apr 2003 carlos.zottmann@stj.gov.br wrote:

>
>
>
>
> Hi!
>
>       We increased the min and max heap trying to solve this problem. At
> first, we had the same configuration parameters than in the old machine.
>
>       Sorry for the newbie question, but how do I run a profiler?  We are
> running with PrintTenuringDistribution, and, because of its output, I have
> changed the young generation size do 128M (Xmn128M), but it didnīt solve
> the problem.
>
>       By the way, we have downloaded JRockit in order to evaluate it, but
> the License Agreement says that it is not free..... Do you know any other
> free implementation of the Java VM?
>
> TIA,
> Carlos Zottmann.
>
> Fax: (61) 319-9411
>
>
>
>                       "Shapira, Yoav"
>                       <Yoav.Shapira@mpi        Para:     "Tomcat Users List"
>                       .com>                     <tomcat-user@jakarta.apache.org>
>                                                cc:
>                       15/04/2003 12:04         Assunto:  RE: Full GC freezes Tomcat
>                       Favor responder a
>                       "Tomcat Users
>                       List"
>
>
>
>
>
>
>
> Howdy,
>
> >The old machine was nicely running Tomcat 4.1.12 with j2sdk-1.4.0 (Xms48M
> >and Xmx128M), and the new one is running Tomcat 4.1.18 with j2sdk-1.4.1_01
> >(Xms512M and Xmx512M).
>
> Why did you increase the min and max heap?  Just because you moved to a new
> server, or for other reasons?
>
> >With the new configuration, memory consumption keeps growing (some GCs and
> >Full GCs are performed, releasing some memory) until it reaches the total
> >available memory, when even Full GC canīt release enough memory and the
> >Tomcat server stops responding.
>
> Run it with a profiler to see what is consuming memory.
>
> >What can be wrong? Should we use jdsdk_3 in order to be able to use the XX
> >parameters?
>
> No.  JDK 1.4 is more stable and supports the various -X parameters better
> than 1.3.
>
> Yoav Shapira
> Millennium ChemInformatics
>
>
>
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