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From "Caldarale, Charles R" <Chuck.Caldar...@unisys.com>
Subject RE: what is the upper limit of maximum heap memory for Tomcat with 32-bit JVM running on Red Hat Linux 4 (32-bit)
Date Fri, 24 Jul 2009 00:22:48 GMT
> From: Alan Chaney [mailto:alan@compulsivecreative.com]
> Subject: Re: what is the upper limit of maximum heap memory for Tomcat
> with 32-bit JVM running on Red Hat Linux 4 (32-bit)
> 
> Actually, to be totally clear, you can have pretty much as 
> much memory as you have physical ram in the machine.

No, you can have up to around 2^48 bytes, if you have a big enough swap file.  The amount
of real memory has no bearing on the maximum size of the Java heap.  (It does have a bearing
on performance, since if you use more aggregate virtual space than real memory, paging ensues.)

 - Chuck


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