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From "Shapira, Yoav" <>
Subject RE: Full GC freezes Tomcat
Date Tue, 15 Apr 2003 18:04:32 GMT


>      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 didnĀ“t solve
>the problem.

The instructions that come with the profiler explain how to do this.  Popular profilers include
OptimizeIt and JProbe.

>      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?

Oh well, no big loss there without JRockit.  You can get the IBM one at
but starting with Sun JDK 1.4.1 I've found no significant differences for my webapps.  Your
mileage WILL vary.

Yoav Shapira
Millennium ChemInformatics

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