I run for my personal pleasure (since I am a number cruncher) the
Scimark2 tests on my P4 Linux machine. I tested GCC 4.0 (today's CVS) vs. GCC
3.4.1 vs. Intel's ICC 8.1
For GCC, I used in both cases the flags
-march=pentium4 -mfpmath=sse -O3 -fomit-frame-pointer -ffast-math
Should be of some interest, for ICC I used
-ipo -tpp7 -xW -align -Zp16 -O3
The results were surprisingly bad, and this is why I am writing this message:
GCC 4.0 GCC 3.4.1 ICC
Composite Score: 270.51 345.28 430.47
FFT Mflops: 192.10 203.77 206.66
SOR Mflops: 257.61 252.88 258.30
MC Mflops: 58.61 67.96 312.13
matmult Mflops: 376.64 557.75 564.97
LU Mflops: 467.58 644.03 810.29
I leave aside any personal comments, except that being involved in Monte Carlo
calculations, I would love if GCC were not outperformed by a factor of ~ 4.5
in MC by ICC.
I also would like to ask whether you see anything wrong with those benchmarks
and/or you have suggestions to improve them.
Thanks,
Biagio
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Biagio Lucini
Institut Fuer Theoretische Physik
ETH Hoenggerberg
CH-8093 Zuerich - Switzerland
Tel. +41 (0)1 6332562
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