Author: Gian-Carlo Pascutto
Date: 01:49:23 01/11/02
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On January 10, 2002 at 22:00:08, Vincent Diepeveen wrote: >Your drums forgot one thing. It is a cluster, not a shared memory >machine. So expect a speedup of like 2.0 or something out of n processors. No. I took this into account when adding in the branching factor. As I understand it, Deep Blue was essentially a cluster too (no shared hashtables for the hardware nodes), so the branching factor should be comparable. On a shared memory machine, I would have assumed a branching factor of 2.5 or 3.0. It would have gone several plies deeper then. The problem was that on a shared memory machine of so many processors I have no idea about the actual parallel efficiency. But we know what branching factor it translated to for DB, so it makes sense to use that number instead. -- GCP
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