Author: Sune Fischer
Date: 02:28:11 04/14/03
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On April 13, 2003 at 11:15:15, Robert Hyatt wrote: >Absolutely no idea. Eugene posted that he has an application that speeds up >by exactly 2.0 when turning SMT on. I have gotten 20-30% improvements in NPS, >and 0-20% improvements in raw time-to-solution. I posted the files needed to >run the test yourself. I ran them a total of six times, and things were >pretty consistent. These numbers fit as far as I can tell, but I do believe there can be cases where the parallel search overhead is so big, that even a 30% boost from SMT won't be enough to overcome it(?). Have you tried investigating when SMT is no longer worth it? Say you had a 4 way box with SMT (8 threads). Wouldn't it be faster in time-to-solution to just use the 4 threads, even if using 8 gave you a 30% nps increase? -S.
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