Author: Robert Hyatt
Date: 07:14:31 05/08/05
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On May 07, 2005 at 00:23:01, Keith Evans wrote: >On May 05, 2005 at 19:48:50, Robert Hyatt wrote: > >>On May 05, 2005 at 17:07:09, Andreas Guettinger wrote: >> >>>On May 05, 2005 at 11:43:40, Robert Hyatt wrote: >>> >>>>On May 05, 2005 at 05:45:07, Martin Andersen2 wrote: >>>> >>>>>Hello! >>>>> >>>>>Orion is shipping a nice small "supercomputer" which has 96 CPU's and >>>>>a peak performance of 230 Gflops. It costs only $100000 :-) >>>>> >>>>>How would an optimized Crafty do on such a thing ? Would it be stronger >>>>>than Hydra ? >>>>> >>>>>Text and pictures here: http://www.orionmulti.com/products/specs_ds96 >>>>> >>>>> >>>>>Martin Andersen >>>> >>>> >>>>This is a cluster box. Currently crafty will not run on a cluster. I hope to >>>>change this over the coming year however... >>> >>>On what kind of cluster will you test? >>> >>>regards >>>Andy >> >> >>We are buying a cluster of dual opteron boxes, but each opteron will be a >>dual-core processor. So we should have 64 nodes with 4 cpus per node, probably >>using both gigabit ethernet and some myrinet hardware we have sitting around. > >How do you handle the transposition table(s) on a cluster? Are there are good >references? Are you inventing a new technique? > >Clueless, >Keith There are two approaches: (1) keep everything local. (no shared transposition table). When you split work, since this is iterative deepening, always give the same position to the same processor the next time around since it has the hash table stuff needed to search that branch most efficiently. (2) asynchronous trans table sharing over the network, which means that you do a remote probe but don't wait for it to complete, to avoid letting the network latency ruin performance... When the result pops in, you look to see if it helps you or not, without waiting for it.
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