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From "Shapira, Yoav" <>
Subject RE: Full GC freezes Tomcat
Date Tue, 15 Apr 2003 15:04:27 GMT


>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 canĀ“t 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

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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