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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 00:19:26 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)
> 
> You are using a 32 bit operating system and a 32 bit processor.
> To make more than 4GB of ram available you must ensure that you
> have PAE support enabled in your kernel

That's not relevant to the problem.  PAE allows the OS to utilize more real memory; it does
not change the virtual memory available to a process, which is the limitation here.

> Even so, I cannot find any clear statement on the web that the
> 32 bit JRE will be able to address more than 4G even if you do
> have PAE enabled. I suspect not.

You are correct - enabling PAE would have no effect.

> 2. Your other 'workaround' is to install a 64 bit OS and a 64 bit JVM.
> Then you can have 7G+ for the JVM.

Much preferred, if the hardware supports it.

 - Chuck


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