Author: Aaron Gordon
Date: 00:13:11 01/16/03
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On January 15, 2003 at 21:30:56, Robert Hyatt wrote: >On January 15, 2003 at 19:30:14, Aaron Gordon wrote: > >>Here's a little bit of math to prove my point. This cpu speedup factor was from >>Hyatt, by the way. The P3-1GHz vs P4-1.6GHz was tested here. Anyway, as I said >>before the 8x1GHz P3 would be > P4-2.8x2 w/ SMT. Here's how. If a P3-1GHz = >>P4-1.6GHz you can figure this... >> >>Lets take the total MHz into account. 8x1000 * 8.0 p3 GHz, * 1.6 = 12.8 P4 GHz. >>Getting a speedup of 5.9 (1+(8-1)*0.7) you get 5.9 p3 GHz / 9.44 P4 GHz. >>For the P4.. (1+(2-1)*.7) = 1.7x speedup, also add 30% for SMT. This comes out >>to 2.21x speedup. Take 2.8 * 2.21 and you get 6.188 P4 GHz. >>9.44GHz > 6.188GHz P4 GHz. 8x1GHz P3 would be over 52% faster. > > >Except you overlook the PIII vs PIV xeon numbers I posted. My dual 2.8 is >almost exactly twice as fast as my quad 700. The quad is PIII xeon, the >dual is PIV xeon with SMT on. I was going on my numbers. So far the binaries I've compiled have been the fastest I've seen so far so I bench with those, profiling for each individual chip. P4 Binary for the P4, P3 binary for the P4, etc. P4-1.6GHz gets 620kn/s and a P3-1GHz gets about 600kn/s. I never saw a post with both being compared. I do remember some posts a while back.. you said something about 1.2mn/s in Crafty with GCC and 1.6mn/s with the IntelC compiler on the Quad. As far as the P4-2.8 w/ SMT benchmarks go all I've seen you post ~1.9-2.0mnps runs. This is a far cry from 3.2mn/s (double the quad 700). A dual 2400+ MP gets almost 2.2 million nps in the Crafty v18.11 benchmark, btw. IntelC 5.01 compile w/ profiling.
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