Author: Gian-Carlo Pascutto
Date: 11:30:09 11/02/02
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On November 02, 2002 at 14:21:48, Eugene Nalimov wrote: >On November 02, 2002 at 13:37:41, Gian-Carlo Pascutto wrote: > >>On November 01, 2002 at 17:26:39, Eugene Nalimov wrote: >> >>>Net result: you can look at the numbers I posted, and you will definitely see >>>that hyperthreading gives current Crafty, without any hyperthread-related >>>modifications, double-digit improvement. >> >>Only in nodes per second, not in real speedup. > >Dual P4/2.4GHz, hyperthreading is on. > >mt=2: times are 42, 43, 39, 40, 38, average is 40. >mt=4: times are 36, 31, 37, 29, 38, average is 34. > >No real speedup, are you sure? You reported 8% earlier on for the real speedup, which is not 'double-digit improvement' I don't really understand how mt=4 can give an additional speedup. Is this the effect of 'pause' and slow memory? Is hyperthreading able to 'emulate' more than 2 cpus? -- GCP
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