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MathGroup Archive 2004

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Re: Use of large memory

  • To: mathgroup at smc.vnet.net
  • Subject: [mg50420] Re: Use of large memory
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 3 Sep 2004 03:35:00 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <ch6n9s$2ao$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

with Windows XP your application has *not* the full 4 GByte address
space of a 32 Bit pointer. Because the operating system  
use some bits of the pointer to manage the tables for virtual
memory.

Only a 64 Bit Operatingsystem and a 64 Bit Mathematica can help
you out. For Intel the only available combination is a 64 Bit Linux
and a 64 Bit Mathematica for Linux.

Regards
  Jens


Gerry Flanagan wrote:
> 
> I was running into memory limits for a large numerical problem in V5.0. The
> fastest fix (I thought) was to get a large amount of RAM. We purchased a
> Pentium 4 machine running XP, with 4GB of memory. I built a test function
> that progressively uses more memory and prints MemoryUsed[]. Every time I
> get to just under 2GB of memory, I get the out-of-memory error from the
> kernal. There's nothing else running, and task manager says there's plenty
> left. Has anyone found some Windows XP tweak that allows Mathematica to use
> what's available? Would this all work better in Linux?
> 
> Gerry Flanagan


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