Re: Q: optimal swap file settings with win3.11
- To: mathgroup at smc.vnet.net
- Subject: [mg3907] Re: Q: optimal swap file settings with win3.11
- From: ianc (Ian Collier)
- Date: Sun, 5 May 1996 23:12:22 -0400
- Organization: Wolfram Research, Inc.
- Sender: owner-wri-mathgroup at wolfram.com
In article <4luue9$3u8 at dragonfly.wolfram.com>, vrossum at electron.phys.uva.nl (M.C.W._van Rossum) wrote: > Hi, > > I'm using mma 2.2.1 with windows3.11 and 16 mb ram. > > Often, when doing large calculations, mma quits kernel due to lack of memory, > despite a large swapfile (48 mb) and giving 24 mb extra to the kernel. > > It seems mma runs into other limitations than memory. > Indeed 1) the memory meter shows still lots of free memory > 2) a smaller swap file works just as good > > So what are the optimal settings for swap file size, > ExtraPages (math.ini) and PagesOverCommit ( system.ini) ?? > > Any comments welcom, > > Mark Without knowing exactly what you are doing I cannot be certain, but I suspect that this is a limitation of your version of Mathematica not a problem with how you have virtual memory configured. The version of Mathematica that you are using is able to address a total of 16 MB of RAM. About 4 MB of that is taken up by the front end and loading the kernel. The setting for "Kernel Extra Memory" that you are using is only able to usefully allocate an additional 12 MB (despite the fact that apparently allows you to allocate more). This 12 MB is the space available to the kernel to perform computations. If your computations regularly cause the kernel to run out of memory then the best thing I can suggest is that you upgrade to the current version of Mathematica for Windows (2.2.3). In this version the front end and kernel are separate applications. The kernel is a Win32s appllication. It uses the Win32s libraries to allow the kernel to address more than one 16 MB memory segment. This will allow you to complete computations that cause your version of Mathematica to run out of memory. In addition to this enhanced memory usage version 2.2.3 also supports MathLink, Mathematica's inter-application communication protocol. For information about upgrading contact info at wolfram.co.uk. I hope this helps. --Ian ----------------------------------------------------------- Ian Collier Wolfram Research, Inc. ----------------------------------------------------------- tel:(217) 398-0700 fax:(217) 398-0747 ianc at wolfram.com Wolfram Research Home Page: http://www.wolfram.com/ ----------------------------------------------------------- ==== [MESSAGE SEPARATOR] ====