Author: Vincent Diepeveen
Date: 09:39:47 05/26/05
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On May 26, 2005 at 12:08:00, Bazsi wrote: >Hello, > >I have just read an article about a "desktop supercomputer": > >http://www.orionmulti.com/products/specs_ds96 > >Crafty (and all SMP-capable engines) would run nicely on this.... :-) > >Balazs No top 50 world chess program can work on the orion machine. The 'interconnects' are latency around 50-400 us to another cpu and the bandwidth the interconnects deliver is too slow too. Latency in chess terms is equal to half the time it takes to get a random chess position from a random processors memory. The only 2 programs that work at clusters are Hydra and Diep. Hydra only with fpga cards. This orion cluster is very poor cluster in this sense that the latency from 1 cpu to another is real dead ugly slow one way ping pong latency. Compare quadrics network i have here (QM500 network cards) has one-way-pingpong latencies of 3 us at my old dual k7 with 66Mhz PCI 2.2 already (let alone 133Mhz pci-x, as it is a pci card). You need not only a NUMA program for it, but also a NUMA program that can stand real ugly latencies. Vincent
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