Author: Ernst A. Heinz
Date: 05:11:51 04/24/98
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On April 24, 1998 at 07:08:31, Carsten Kossendey wrote: >If you look at the STREAM (memory bandwidth) benchmark results >(www.cs.virginia.edu/stream), it doesn't seem to help much ;) IBM's RS6000 is well-known for its outstanding memory performance. Many people joke that you pay 4/5 of the price for the memory subsytem of the RS6000 ... :-) If I remember correctly the RS6000 has no external cache which helps here and in many engineering applications. And it is by far more expensive than Alpha workstations and compatibles. For computer chess, the integer-wise and MHz-wise "slow" POWER CPUs are no good choice at all. >It appears the Power2 SuperChip blows them Alphas (as well as most other >processors) by a factor 3 or so. Also take note of that T94 result - >other Crays fare similarly good, except for the Alpha-based designs. As your last sentence already indicates, the STREAM results have not much to do with the CPUs themselves but rather with the surrounding memory system (e.g. Cray T3D/T3E has no external caches as well). The nice thing about the Alphas is that they blow away all comparably priced competitors ... :-) =Ernst=
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