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Benchmarking GCC 4.2 Through GCC 4.8 On AMD & Intel Hardware
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I'd love to see ffmpeg compared with ASM switched off - so we can actually see which is the better compiler of C code and produces the faster binaries - yes I know no one in their right mind would use these binaries on a real system but the results could be normalised against the ASM builds
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Originally posted by birdie View PostMichael,
What GCC flags did you use during testing?
I'm guessing that for each of these tests, the flags are the default that are used in the individual PTS test profiles.
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Originally posted by coder543 View Postoutdated hardware running at vastly different clock speeds and core counts being compared.
It's done in the correct way, so that you can compare the performance of the generated code relative to the machine. You are not supposed to compare the Intel results to the AMD results.
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Originally posted by kiwi_kid_aka_bod View Postcoder543, you seem to have missed the point of the article. It is comparing versions of GCC, not Intel vs. AMD.
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A couple of interesting things I see:
1. In C-Ray, intel was faster with gcc 4.2, amd ends up faster with gcc 4.7/4.8.
2. In FLAC audio encoding, the stiuation is actually reversed (though the differences are smaller this time): amd start out on top end ends up at the bottom.
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coder543, you seem to have missed the point of the article. It is comparing versions of GCC, not Intel vs. AMD.
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outdated hardware running at vastly different clock speeds and core counts being compared. This is the most uninformative article from Phoronix in a long time.. can we please compare a Bulldozer Opteron versus Intel's latest and have them run at similar clock speeds with the same number of hardware threads ("cores" for AMD and "threads" for Intel via hyperthreading)? or a Bulldozer Opteron versus an equally priced Intel? either way.
I know the AMD would probably get stomped, but that would be useful information, and it excited me to see that information so I came here to read it and got disappointed.
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I wonder if GCC hackers actually use PTS for regression testing? While its easy to benchmark and compare side-by-side, personally I have quite a trouble navigating via webinterface.. :/
And huge thanks for the article!!
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