At 09:59 AM 2/23/2005, you wrote:
>Hi all,
>
>I have a question which puzzles me, about running LAM.
>I have a 32-bit Dual Intel Xeon machine, and an AMD 64-bit Dual Opteron
>machine.
>Both of them are running Solaris 10, Build 72.
>
>I want to know whether there is a difference in performance between
>running LAM across two 32-bit machines, or across one 32, and one 64-bit
>machine.
>I use HPL 1.0a to try to investigate this issue, but the performance
>ratings are the same, for both conditions.
I think your combination of questions exceeds anyone's desire to tackle
it. Since your 64-bit machines may be capable of running 32-bit software
with better performance than your 32-bit machines, you should consider
running 32-bit lam-mpi and the same application build throughout. If your
work is anywhere close to balanced, your performance will be limited by the
slower machines.
Tim Prince
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