Author: Wayne Lowrance
Date: 07:36:36 09/05/02
Go up one level in this thread
On September 05, 2002 at 10:14:18, Robert Hyatt wrote: >On September 05, 2002 at 02:31:19, Slater Wold wrote: > >>On September 05, 2002 at 00:47:17, martin fierz wrote: >> >>>thanks, this is really interesting. i never realized that SMP searches could be >>>so variable in some positions and very stable in others. >>>actually, vincent might like this, because it's >2 speedup :-) >>> >>>aloha >>> martin >> >>I have seen on my duals, more than once, an SMP program solve a problem in 3 >>minutes. >> >>Then 2 hours later I try the same position and it solves it in 5 minutes. >> >>SMP is *way* to random in its branching to be what normal people call "stable". > > >I take that variability as "part of the pain". But if you looked at the data >I gave Martin, there _is_ something that is very troubling. In one of the >runs, two processors were actually _slower_ than one. Granted that it is a >pathological type of position, but anytime two is slower than one gets my >attention in a big way. Bruce once sent me a position where four were >1/10th as fast as one. I fooled with that for a long time before understanding >it and improving the parallel search to fix it. Now this is the tone of discussion as it should be! My congratulations Wayne
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