TalkChess.com

[Daniel Shawul]

Does anyone have any idea on the details of thehardware used by zappa on 512 cores? I suppose it is a NUMA machine from sgi. By how much did it scale ? What kind of performance tuning was done ? Also the old CilkChess was run on similar SMP machine of 256 cores but scaling was not that good IIRC. So what kind of scaling should be expected from a 256/512 core SMP machine in general ? Are there successful stories of a cluster chess playing program in the past? I had a chance to try scorpio cluster with different interconnects but no success (infiniband,quadrics,myrinet,gigE etc..) nothing. It performs bad after 8 processors. Even I am having difficult with scaling on NUMA smp systems (note I haven't done any kind of optimization , not even the simple allocating split blocks on "near" locations).The one I am testing on has 8 nodes with 4 cores each with inifiniband interconnect. I will see if there are gainst after I do the memory affinity for each thread.
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