Charmm is a molecular dynamics code which is widely used in both industry and academia. It has a difficult global communications pattern; no current computing system scales well beyond sixty-four processors on this code. Modern Pentium PC's with fast ethernet do not scale well beyond four CPUs on this code.

The performance graph shows Charmm performance on the WAT benchmark case.

This is the one instance where the SGI O2K (with 195 mhz processors) actually beats our 21164 Alphas. However, our more modern 21264-based Alpha systems are faster than the SGI.

Thanks to Mike Crowley for helping with these numbers.

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