Author: Keith Evans
Date: 09:34:13 04/10/03
Go up one level in this thread
On April 10, 2003 at 11:11:52, Vincent Diepeveen wrote: >On April 10, 2003 at 11:07:06, Robert Hyatt wrote: > >>On April 10, 2003 at 08:44:18, Vincent Diepeveen wrote: >> >>>On April 09, 2003 at 17:58:21, Robert Hyatt wrote: >>> >>>as usual you were asleep when replying. i did math for a single cpu. that >>>extrapolates to more cpu's as well. >> >>I did math that extrapolates to _everything_. >> >>If I get 1.7X speedup for two cpus, I will get _some_ speedup no matter how slow >>the >>second processor is. >> >>Which was my point. > >with SMT that is not the case. the second cpu in SMT delivers somewhere between >0% and 20%. > >If it is 10% like it is for most programs then: > >1.1 speed is what you get out of single P4 with smt. > >1.7 / 2 * 1.1 = 0.935 which is slower than single cpu. > >Which is my point. Why are you dividing 1.7 by 2? I thought that Bob already measured this on a single Xeon with SMT and got a speedup of 1.1 or so.
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