Author: martin fierz
Date: 01:13:57 05/07/04
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On May 06, 2004 at 20:02:50, Robert Hyatt wrote: >On May 06, 2004 at 19:03:48, martin fierz wrote: > >>aloha! >> >>bob posted some crafty logfiles running a 24-position test set on his ftp site >>(for anyone else crazy enough to repeat what i did: >>ftp.cis.uab.edu/pub/hyatt/smpdata) >> >>these are logfiles of crafty running as single CPU, dual, or quad; on opterons. >>i took the last completed ply on the single CPU set for each position (marked by >>-> in the logfile, i hope...), wrote down the time to complete this ply, and did >>this for all logfiles. there are 9 of these, 4 repeats for 2 and 4 CPUs. i >>computed the speedup for time-to-finish-ply-X for each of the multi-CPU runs >>with the following results: >> >>2 CPUs: >>1.961 +- 0.093 >>1.888 +- 0.074 >>1.846 +- 0.078 >>1.763 +- 0.084 >> >>4 CPUs: >>3.15 +- 0.15 >>3.29 +- 0.20 >>3.06 +- 0.12 >>3.19 +- 0.13 >> > >That is higher than my number although I only checked log 1 for mt=4. Did you >compute the speedup for each position, then add and divide by 24? yes, i did. > If so, I'm >not a fan of that way. A long search on an efficient position skews the >results. I prefer to take the total time for each run and use that... i'm not a fan of doing that, because in that case, some weird positions don't produce PVs after 1 minute, while others produce a PV after close to 5 minutes, and one position gets more weight than others... i don't quite understand your point, because the length of a run on an efficient position does not matter in my way of computing things. i was interested in the speedup as such per position, to see how variable it is for any given position. to see that, i have to do it this way. you lose this information when you lump everything together, and have no means to calculate a variability in the end... or none that i can think of within a few seconds while i'm typing this :-) cheers martin
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