Author: Vincent Diepeveen
Date: 06:07:46 04/11/03
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On April 10, 2003 at 20:32:06, Tom Kerrigan wrote: Tom can you please publicly say whether you disagree or agree with this math. Bob claims next: a) 30% increased speed in nps for SMT for crafty b) 3.0 speedup out of 4 processors. What is his speedup out 4 threads on a dual Xeon then versus 2 threads non-SMT on the same dual Xeon? If he shows a speedup in TIME do you agree then that bob's trick is to not show how many nodes a second he needs for each ply? Which would mean simply that his 30% speedup in nps is simply not true. >On April 10, 2003 at 11:11:52, Vincent Diepeveen wrote: > >>with SMT that is not the case. the second cpu in SMT delivers somewhere between >>0% and 20%. > >It amazes me how simple your train of thought must have been to come up with >this one. Was it something like this? > >* Hyperthreading gives you 2 logical processors >* Hyperthreading speeds things up by 0-20% > >Therefore, your 2nd logical processor must be 0-20% as fast as the first. > >Brillant! > >-Tom
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