Messages in this thread | | | From | (Larry McVoy) | Subject | Re: Interesting scheduling times - NOT | Date | Thu, 24 Sep 1998 16:40:05 -0700 |
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Oliver Xymoron <oxymoron@waste.org>: : > : This is not really true, especially for something like make. If you : : > The claim was that cache interference would explain variations in run : > times of 70-100%. : : I agree that this is not likely the proper explanation.
That's cool, that was all I wanted to establish.
: > My counter claim was that if that were true, things : > like make would not be deterministic. : : But this is also not likely true. As long as the number of cache accesses : (hits or misses) is relatively high, ie high enough that the cache gets : turned over fairly frequently, the variances of individual cache access : timings tend to cancel each other out.
Yes, that's true - and also holds true for the benchmark. I think what you are saying here is that you shouldn't be seeing high variance in either the make or the context switch case.
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