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GCC 7.0 vs. LLVM Clang 4.0 Performance (January 2017)

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  • #11
    AFAIK, today many projects use llvm during development but ship their production builds build with gcc. Would it be possible to compare the performance of real life applications such as firefox, dorktable or some open source games?

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    • #12
      Originally posted by treba View Post
      AFAIK, today many projects use llvm during development but ship their production builds build with gcc. Would it be possible to compare the performance of real life applications such as firefox, dorktable or some open source games?
      FYI, the OpenMandriva linux distribution, https://www.openmandriva.org, is built almost entirely with clang 3.9.1. https://wiki.openmandriva.org/en/3.01/Release_Notes.

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      • #13
        Originally posted by treba View Post
        AFAIK, today many projects use llvm during development but ship their production builds build with gcc. Would it be possible to compare the performance of real life applications such as firefox, dorktable or some open source games?
        This, and maybe with the use of LTO.

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        • #14
          Why are the tests done with powersave mode? "Scaling Governor: intel_pstate powersave"

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          • #15
            Originally posted by rx80 View Post
            Why are the tests done with powersave mode? "Scaling Governor: intel_pstate powersave"
            Ubuntu default...
            Michael Larabel
            https://www.michaellarabel.com/

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            • #16
              Originally posted by Michael View Post

              Ubuntu default...
              The problem is that this benchmark is now measuring any bugs in the governor, the CPU frequency potentially jumping more than 50%

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              • #17
                Originally posted by rx80 View Post

                The problem is that this benchmark is now measuring any bugs in the governor, the CPU frequency potentially jumping more than 50%
                Given the same governor was used throughout testing and that each benchmark is run a minimum of three times and increases if std dev is too great, and the deviations are shown on the graphs and nothing appeared awkward with these results, I don't think it's too much concern.
                Michael Larabel
                https://www.michaellarabel.com/

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                • #18
                  Looks like a guy can hardly go wrong here choosing a compiler,

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                  • #19
                    Originally posted by treba View Post
                    AFAIK, today many projects use llvm during development but ship their production builds build with gcc. Would it be possible to compare the performance of real life applications such as firefox, dorktable or some open source games?
                    dorktable... that's rude
                    I don't think you will get lots of interest on firefox with browser benchmarks, since I assume the work is mostly done by the JIT'd code.
                    But for open source games, that would be pretty cool indeed.

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                    • #20
                      Update Bullet to 2.86. Your test is ancient.

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