> From: Amir Hadadi [mailto:ami...@correlix.com]
> Subject: Xmx definition
> 
> I'm running apache tomcat version 5.5.23. my OS is CENTOS 5.

Not relevant; what is relevant is the JVM version, which you didn't mention.

> I've used Runtime.getRuntime().getMaxMemory() to get an approximation
> of my Xmx. The figure I got was 842MB.

> I wonder were this number came from.

To quote from the Sun JVM 6 initialization code:

  // If the maximum heap size has not been set with -Xmx,
  // then set it as fraction of the size of physical memory,
  // respecting the maximum and minimum sizes of the heap.

 - Chuck


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