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From "Shapira, Yoav" <>
Subject RE: Full GC freezes Tomcat
Date Tue, 15 Apr 2003 16:25:38 GMT

If you move to JRockit, be careful of the many annoying migration pointers when moving to
JRockit, not to mention its increased memory usage.  See
for example.

I think this one is my favorite:
"On WebLogic JRockit, the current default implementation of hashCode returns ... This implementation
is not particularly useful for hashing; therefore, derived classes should override hashCode()."

A solid piece of engineering there, huh? ;)  I know, I know, every piece of software has its
weak points, but the above makes me laugh every time I read it ;)

Yoav Shapira
Millennium ChemInformatics

>-----Original Message-----
>From: Vic Cekvenich []
>Sent: Tuesday, April 15, 2003 12:16 PM
>Subject: Re: Full GC freezes Tomcat
>Try using one of the many non Sun VM. (BEA, Orcale and IBM do).
>You will have much luck with this, it's free:
>Note how you can monitor the GC remotely and a nice paper on GC.
> wrote:
>> Hi!
>> We recently upgraded a one processor, 256 Mbytes RAM machine, to a 2
>> processors, 1 Gbytes RAM machine.
>> 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-
>> (Xms512M and Xmx512M).
>> With the new configuration, memory consumption keeps growing (some GCs
>> Full GCs are performed, releasing some memory) until it reaches the total
>> available memory, when even Full GC canĀ“t release enough memory and the
>> Tomcat server stops responding.
>> What can be wrong? Should we use jdsdk_3 in order to be able to use the
>> parameters?
>> Thanks in Advance,
>> Carlos Zottmann.
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