<div dir="ltr">There are a bit fresher results for clang 3.8 (though no comparison with gcc): <a href="http://www.phoronix.com/scan.php?page=article&item=llvm-clang-363738&num=3">http://www.phoronix.com/scan.php?page=article&item=llvm-clang-363738&num=3</a><div><br></div><div>Yours,</div><div>Andrey</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Aug 23, 2016 at 3:12 PM, Alexey Bataev via Openmp-dev <span dir="ltr"><<a href="mailto:openmp-dev@lists.llvm.org" target="_blank">openmp-dev@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">



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<div>Phoronix results are not quite correct. Seems to me they have some problems with compilation flags. Tried to investigate their results a few years ago and got completely different numbers. <br>
<br>
Best regards,
<div>Alexey Bataev</div>
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<div><br>
23 авг. 2016 г., в 7:54, Hahnfeld, Jonas via Openmp-dev <<a href="mailto:openmp-dev@lists.llvm.org" target="_blank">openmp-dev@lists.llvm.org</a>> написал(а):<br>
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<p class="MsoNormal"><span style="color:#1f497d">There was in article one year ago:
<a href="http://www.phoronix.com/scan.php?page=article&item=clang-svn-openmp&num=2" target="_blank">
http://www.phoronix.com/scan.<wbr>php?page=article&item=clang-<wbr>svn-openmp&num=2</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">I never came around to confirm the test results and it may look different for 3.9 now…<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Jonas<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Openmp-dev [<a href="mailto:openmp-dev-bounces@lists.llvm.org" target="_blank">mailto:openmp-dev-bounces@<wbr>lists.llvm.org</a>]
<b>On Behalf Of </b>Cownie, James H via Openmp-dev<br>
<b>Sent:</b> Tuesday, August 23, 2016 1:48 PM<br>
<b>To:</b> <a href="mailto:openmp-dev@lists.llvm.org" target="_blank">openmp-dev@lists.llvm.org</a><br>
<b>Subject:</b> [Openmp-dev] Public Benchmarks?<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">I just noticed that the LLVM page in Wikipedia (<a href="https://en.wikipedia.org/wiki/LLVM" target="_blank">https://en.wikipedia.org/<wbr>wiki/LLVM</a> ) contains the statement
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif""><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB" style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#252525;background:white">For run-time performance of the compiled programs, GCC formerly outperformed LLVM by 10% on average.</span>^{<span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#252525;background:white"><a href="https://en.wikipedia.org/wiki/LLVM#cite_note-18" target="_blank"><span style="color:#0b0080;text-decoration:none">[18]</span></a><a href="https://en.wikipedia.org/wiki/LLVM#cite_note-19" target="_blank"><span style="color:#0b0080;text-decoration:none">[19]</span></a></span>}<span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#252525;background:white"> </span></span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#252525;background:white">Newer
 results indicate that LLVM has now caught up with GCC in this area, and is now compiling binaries of approximately equal performance,
<span style="background:yellow">except for programs using<span> </span></span></span><span lang="EN-GB" style="font-size:14.0pt;background:yellow"><a href="https://en.wikipedia.org/wiki/OpenMP" title="OpenMP" target="_blank"><span style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#0b0080;text-decoration:none">OpenMP</span></a></span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#252525;background:yellow">.</span>^{<span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#252525;background:yellow"><a href="https://en.wikipedia.org/wiki/LLVM#cite_note-20" target="_blank"><span style="color:#0b0080;text-decoration:none">[20]</span></a></span>}<span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">I believe that is wrong (their evidential link is from 2012!), and our OpenMP performance is now at least comparable with, if not
 better than, that of GCC, but I don’t have any public benchmarks to prove it. <u></u>
<u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">So, does anyone have any pointers to public articles that show that, so that we can go in and fix the Wikipedia article?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">(Phoronix’ latest at
<a href="http://www.phoronix.com/scan.php?page=article&item=gcc-61-clang39&num=1" target="_blank">
http://www.phoronix.com/scan.<wbr>php?page=article&item=gcc-61-<wbr>clang39&num=1</a> doesn’t seem to have any OpenMP codes in it, so that’s no use).<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Thanks<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">-- Jim<br>
<br>
James Cownie <<a href="mailto:james.h.cownie@intel.com" target="_blank">james.h.cownie@intel.com</a>><br>
SSG/DPD/TCAR (Technical Computing, Analyzers and Runtimes)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Tel: <a href="tel:%2B44%20117%209071438" value="+441179071438" target="_blank">+44 117 9071438</a></span><span lang="EN-GB"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p>
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