> From: Christopher Schultz [mailto:[EMAIL PROTECTED] 
> Subject: Re: [OT]Re: Is better one or more Tomcat instances 
> per machine
> 
> I don't think this has anything to do with hardware. 

It does.  To quote from the IA32 architecture spec:

"Starting with the Pentium Pro processor, the IA-32 architecture also
supports an
extension of the physical address space to 236 bytes (64 GBytes); with a
maximum
physical address of FFFFFFFFFH. This extension is invoked in either of
two ways:
* Using the physical address extension (PAE) flag, located in bit 5 of
control
register CR4.
* Using the 36-bit page size extension (PSE-36) feature (introduced in
the Pentium
III processors)."

> Apparently, certain 32-bit versions of Solaris do not have 
> this problem, and Java can use as much memory as any process.

Not sure what the last clause above means, but there are differences in
Solaris on Sparc and Solaris on x86.

> [EMAIL PROTECTED] ~/projects/diagnosis $ uname -a
> Linux chadis 2.6.14-gentoo-r5 #2 PREEMPT Sat Dec 17 16:30:55 EST 2005
> i686 AMD Athlon(tm) XP 1700+ AuthenticAMD GNU/Linux
> [EMAIL PROTECTED] ~/projects/diagnosis $ java -Xms1732M -Xmx1732M JDBCTest
> Error occurred during initialization of VM
> Could not reserve enough space for object heap
> 
> If I decrease the heap size by 1M, it works. <shrug>

What are your ulimit settings?

 - Chuck


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