Author: Dann Corbit
Date: 10:40:46 09/26/01
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On September 26, 2001 at 10:17:06, Robert Hyatt wrote: [snip] >I don't know where this rumor comes from. My SMP version is so close to my >non-SMP version in speed, I can't tell the difference. The only reason I have >a non-SMP version is that it doesn't make sense to run two threads on a single >cpu. And beginners would make that mistake too often to think about. > >In Crafty, the "SMP overhead" on a non-SMP machine is one memory load and >one conditional branch. This load/branch tests to see if there is an idle >processor. The program currently executes maybe 8,000 instructions per node. >That turns it into 8,002. That is no penalty to speak of. > >Other issues like libraries simply don't count as they aren't used inside the >search... There is a much larger difference with the Windows compilers for SMP/non-SMP. Could be there is some other difference in compiler settings that accounts for it, however.
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