<div dir="ltr">Thanks for the testcase. Could you add some more details about the regression?<div><br></div><div>* How to build/run the testcase to reproduce the degradation?</div><div>* Is the degradation only exist in ATOM/SLM arch? If yes, could you help analyze why maximize the bandwidth would make performance worse (as we do not have these arches to run the perf tests).</div><div><br></div><div>Thanks,</div><div>Dehao</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jun 1, 2017 at 6:12 AM, Agabaria, Mohammed <span dir="ltr"><<a href="mailto:mohammed.agabaria@intel.com" target="_blank">mohammed.agabaria@intel.com</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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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Attached the first reproducer of the Atom\SLM arch. degradation. (~70% degradation).<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Chandler, those are part of EEMBC benchmarks.<u></u><u></u></span></p>
<p class="MsoNormal"><a name="m_-5809481389304274555__MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></a></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Chandler Carruth [mailto:<a href="mailto:chandlerc@gmail.com" target="_blank">chandlerc@gmail.com</a>]
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<b>Sent:</b> Tuesday, May 30, 2017 23:07<br>
<b>To:</b> Agabaria, Mohammed <<a href="mailto:mohammed.agabaria@intel.com" target="_blank">mohammed.agabaria@intel.com</a>>; Flamedoge <<a href="mailto:code.kchoi@gmail.com" target="_blank">code.kchoi@gmail.com</a>>; Dehao Chen <<a href="mailto:dehao@google.com" target="_blank">dehao@google.com</a>></span></p><div><div class="h5"><br>
<b>Cc:</b> llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>><br>
<b>Subject:</b> Re: [llvm-dev] Enable vectorizer-maximize-bandwidth by default?<u></u><u></u></div></div><p></p><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Tue, May 30, 2017 at 1:40 AM Agabaria, Mohammed via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<u></u><u></u></p>
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<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">We’re seeing nice improvements but also significant degradations on IA, which we would like to investigate before the patch is committed.</span><u></u><u></u></p>
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<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black"> </span><u></u><u></u></p>
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<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">Major degradations we see:</span><u></u><u></u></p>
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<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black"> </span><u></u><u></u></p>
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networking<u></u><u></u></p>
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ip_pktcheckb1m -6.80 %<u></u><u></u></p>
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ip_pktcheckb2m -6.74 %<u></u><u></u></p>
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ip_pktcheckb4m -7.57 % <u></u><u></u></p>
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ip_pktcheckb512k -6.58 %<u></u><u></u></p>
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Telecom<u></u><u></u></p>
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autcor00data_1 -78.02 %<u></u><u></u></p>
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autcor00data_2 -76.80 %<u></u><u></u></p>
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autcor00data_3 -77.00 %<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">
</span><u></u><u></u></p>
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<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">(on Atom)</span><u></u><u></u></p>
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<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black"> </span><u></u><u></u></p>
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<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">We still working on creating reproducers.
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<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">In general we support this patch, just want to have a chance to investigate the issues. We need a few days for that.</span><u></u><u></u></p>
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<p class="MsoNormal">I mean, OK... but keep in mind that Dehao's original email went out over a week ago, so this patch has already been held up a while. As these benchmarks aren't readily available, we also can't do anything to help until a test case is posted.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Have you considered contributing these benchmarks to the LLVM test suite?<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><a name="m_-5809481389304274555_m_-1727573473381385812______replyseparat"></a><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">
llvm-dev [<a href="mailto:llvm-dev-bounces@lists.llvm.org" target="_blank">mailto:llvm-dev-bounces@<wbr>lists.llvm.org</a>]
<b>On Behalf Of </b>Chandler Carruth via llvm-dev<br>
<b>Sent:</b> Tuesday, May 30, 2017 11:27<br>
<b>To:</b> Flamedoge <<a href="mailto:code.kchoi@gmail.com" target="_blank">code.kchoi@gmail.com</a>>; Dehao Chen <<a href="mailto:dehao@google.com" target="_blank">dehao@google.com</a>><br>
<b>Cc:</b> llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>><br>
<b>Subject:</b> Re: [llvm-dev] Enable vectorizer-maximize-bandwidth by default?</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">If you care about such hardware, please run benchmarks with the flag?<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">Dehao has made this flag available. It is important that those who care about particular hardware provid ebenchmark results. Not everyone in the community will have access to particular
hardware variants.<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">On Tue, May 30, 2017 at 1:14 AM Flamedoge <<a href="mailto:code.kchoi@gmail.com" target="_blank">code.kchoi@gmail.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Thank you for running these.<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">May I suggest testing on AVX2 capable hardware? That would be Intel Haswell, AMD Carrizo and up.<u></u><u></u></p>
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<p class="MsoNormal">I'm not sure what "<span style="font-size:9.5pt">vectorizer-maximize-<wbr>bandwidth" implies, but doubling the vector lanes may help light up parallel regions.</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Kevin</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">On Tue, May 30, 2017 at 12:58 AM, Chandler Carruth via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">On Fri, May 19, 2017 at 4:01 PM Adam Nemet via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">I will run it on Cyclone/AArch64 next week.<u></u><u></u></p>
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<p class="MsoNormal">FYI, we're still waiting on these Adam...<u></u><u></u></p>
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