Author: Vincent Diepeveen
Date: 07:40:03 08/30/03
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On August 29, 2003 at 23:41:32, Jeremiah Penery wrote: >On August 29, 2003 at 18:40:23, Mridul Muralidharan wrote: > >>I'm not sure of what/why Prof. Bob Hyatt may have made those comments. But to >>get a program like crafty to work properly in a numa machine will not be trivial >>- and it wont be tweaks , but something more. > >All multi-CPU Opteron machines are NUMA. Crafty will work just fine in those. >It will not be theoretically optimal, but that also depends on the OS to help >with NUMA issues. The OS has to do very little for chessprograms. Just keep scheduling the same process at the same cpu and physically allocating local memory at that cpu's RAM. Of course for a lot of other services the OS has to do a lot different, yet in chessprograms we do not need it as most of us, except for example cilkchess, write their parallellism at a very low level. >>Duals , etc count as SMP machine not cc-numa which I was refering to. >Dual Opterons are NUMA. And soon all duals that we can afford will be. Best regards, Vincent
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