Author: Robert Hyatt
Date: 20:58:36 12/08/02
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On December 08, 2002 at 22:14:44, Jeremiah Penery wrote: >On December 08, 2002 at 21:24:52, Robert Hyatt wrote: > >>I also think that the numbers for the HT-enabled stuff might be wrong. The >>node counts should vary, because to use HT, it is necessary to run the SMP >>version of crafty and use mt=2 to use both logical processors. That will >>produce variability in the total nodes searched that I didn't see in any of >>the numbers displayed... > >All of Aaron's numbers were single-threaded Crafties. But Steffen posted a >result with HT that used LESS total nodes than the single-threaded program, but >only had a 13% speedup in terms of raw NPS. OK. The only data I have to go on at the moment is my dual 2.8 xeon with HT. I will try to run the benchmark tomorrow and post results. I have to be at the office to do this as the only way I can turn SMT off is to reboot, go into the BIOS setup and turn "logical cpu" off (Dell's syntax, not mine). I got a clean 33% faster in NPS. I didn't check the actual search times very carefully but I will try to do so. I can run 1/2 cpus with SMT off, and 3/4 with SMT on, and compare both NPS and raw time-to-solution times...
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