Author: Vincent Diepeveen
Date: 15:20:09 05/01/04
Go up one level in this thread
On May 01, 2004 at 18:10:32, Robert Hyatt wrote: >On May 01, 2004 at 15:18:33, Joachim Rang wrote: > >>On May 01, 2004 at 15:06:24, Robert Hyatt wrote: >> >>>My results... on a quad 700mhz xeon >>> >>>1cpu 289 secs 1.0 speedup 294K nps >>>2cpu 172 secs 1.7 speedup 571K nps >>>3cpu 127 secs 2.4 speedup 833K nps >>>4cpu 100 secs 2.9 speedup 1079K nps >>> >>>Unfortunately this machine was running nfs for the entire department so it >>>wasn't totally idle, but the numbers seem within "reason" of what I would >>>expect. Note also that I didn't run multiple runs and average the times, so >>>there could be some random noise in the above as always... >> >>still below 3 even for such a SMP-Giant like Crafty. >>For an 8-way machine what do you expect? >> >>regards Joachim > > >My estimate is always speedup = 1 + (CPUS - 1) * .7 as a rough number. Some >positions go higher, some go lower... > >So figure about 6x on 8-way... I have tested that myself. 16 and beyond are >not so clear yet... 8 ways are kind of NUMA, so forget it for crafty.
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