Author: Tom Kerrigan
Date: 00:10:57 03/05/00
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On March 04, 2000 at 23:17:45, Robert Hyatt wrote: >>In that case, I don't think it's possible to use Crafty to compare the processor >>cores. The TSCP benchmarks give much more accurate data in that regard. >> >>-Tom > > >Only for small programs. What about programs with larger cache footprints? I don't see why you want to bring the cache into this, if you just want to compare the cores. (Which I do.) >Which means no register jams occur in the program. For more complex programs, >the renaming logic in the P6 avoids many register jams/spills and does much >better keeping both pipes filled. Do you have any proof of this? Here's a simplification of the issue, but it helps to illustrate the problem: The P5 has a 5 stage pipeline. For it to be full, it needs to be executing 2*5=10 instructions at once. The P6 has a 12 stage pipeline. It needs 12*2=24 instructions to be full. So if somebody told me that the Pentium's pipes are usually more full than the P6's pipes, I would have absolutely no problem believing it. Even if the P6 does have all sorts of fancy features. -Tom
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