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From: "Li,Henry" <henryli@mdanderson.org>
To: 'Tomcat Users List' <users@tomcat.apache.org>
Date: Thu, 23 Jul 2009 19:59:59 -0500
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)
Thread-Topic: what is the upper limit of maximum heap memory for Tomcat with
 32-bit JVM running on Red Hat Linux 4 (32-bit)
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Thank you Chuck! I will go to the 64-bit.

Regards,
Henry


-----Original Message-----
From: Caldarale, Charles R [mailto:Chuck.Caldarale@unisys.com]=20
Sent: Thursday, July 23, 2009 7:19 PM
To: Tomcat Users List
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)

> 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)
>=20
> 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, whic=
h 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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