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Re: Use of large memory

• To: mathgroup at smc.vnet.net
• Subject: [mg50438] Re: Use of large memory
• From: fei.fzhou at gmail.com (Fei)
• Date: Fri, 3 Sep 2004 03:36:30 -0400 (EDT)
• References: <ch6n9s$2ao$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

I have been running Mathematica on HP tru64 unix, linux + Xeon, linux
+ Itanium2 and SunOS machines, all with more than 4 GB of memory, but
mathematica cannot handle any matrix larger than 2GB. When one
allocates several smaller matrices with total memory > 2GB,
MemoryUsed[] is negative. This is quite disappointing. Could any
person from Wolfram explain what is happening?

thanks,
Fei

Gerry Flanagan <flanagan at materials-sciences.com> wrote in message news:<ch6n9s$2ao$1 at smc.vnet.net>...
> 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