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