Author: George Sobala
Date: 05:24:54 07/08/03
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On July 08, 2003 at 06:52:43, Vincent Diepeveen wrote: >Speedup as it is in all the ICCA journals from the 80s and onwards is the number >of times you are faster out of n processors when compared to 1 processor of such >a system. > >So if i would get the blessed efficiency of 15% out of 500 processors that is > >0.15 * 500 = 75 times speedup > >However to compare it to the speed of a K7 1Ghz it is interesting to express it >in Ghz in this case: 37.5 Ghz > >So it effectively then 37.5 times faster than a K7 at 1 Ghz, assuming that K7 >has a hashtable of 250GB. > >Most programmers talk always about speedup, but that's for a fixed amount of >cpu's they always have. Like 2. > >However with many cpu's i cannot always test with the same amount of CPUs so >speedup efficiency is a better form then to measure than speedup. > >Best regards, >Vincent That assumes that "speedup efficiency" is a constant across n processors, for any size of n. Is it? Seems very improbable.
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