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64-bit vs. 32-bit?

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Old   January 26, 2005, 09:58
Default 64-bit vs. 32-bit?
Olof Liungman
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we run Phoenics 3.2 on a SGI Challenge multiprocessor server. The CPU:s are MIPS 10000, I believe (pretty old by now). We are considering new hardware, e.g. a multiprocessor PC running Linux.

However, some time ago I compared the results from the same Phoenics simulation run on the SGI machine and a standard Windows PC. I found that the convergence was much less exact on the PC, i.e. the error in volume conservation was perhaps 1% or so at the end of a transient run. On the SGI, the error was many orders of magnitude smaller.

Does this have anything to do with the PC being 32-bit and the SGI 64-bit (whatever that means, exactly...)? We are nervous that if we get a new machine with 32-bit CPU:s we might have trouble reaching convergence in some cases, or that the results will be less exact.

I hope someone can help,

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