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From "Shapira, Yoav" <>
Subject RE: heap size
Date Wed, 23 Jul 2003 17:50:13 GMT


>I am a bit confused: I am running Tomcat 4.1.18 on Linux, with JDK
>1.4.1_03-b02.  Nowhere in the startup scripts do I see it specified how
>much memory to use (i.e., with the -Xmx flag).  When I call
>Runtime.totalMemory(), it gives me 128MB, yet I was under the
>impression that the JVM sets aside 64MB by default.

No -Xmx leaves it with the default for the VM.  All the -X's are
optional parameters.  I too thought 64MB was the default.

>On a possibly unrelated note, is it feasible to force garbage
>collection on Tomcat's JVM, either through Tomcat or the JVM itself?
>Googling has revealed only the official answer to this question, but
>I've heard that most profilers can do this.


Profilers, and apps, can call System.gc(), which is a suggestion and
cannot force GC.  

Yoav Shapira

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