Author: Bruce Moreland
Date: 11:36:12 07/20/98
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On July 20, 1998 at 14:30:47, Dan Newman wrote: >I think I've seen this priming-the-pump effect--though perhaps not as >pronounced as a 4% change in node rate. Is it due to branch prediction >being pre-set by the first run or some sort of alignment variation? I don't know. 4% seems like a lot, but I've seen several percent at least, discounting any disk I/O which would be cached on later runs, and could of course result in even more difference. I'm not a hardware guy. >One of the biggest effects I see is that I get a much larger node rate >the longer I run. If I run a test for 10 s I might get 170 knps. If >I run for 40 s 200 knps. It does level off of course. I'm using a >P6/200, so I've attributed this effect to improving branch prediction >as the code runs. Any ideas? Maybe it has something to do with the deeper search having characterstics that differ from the shallower search. bruce
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