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<p class="MsoNormal">Ben, David<o:p></o:p></p>
<p class="MsoNormal">I’m still baffled by how to reliably get GHC perf metrics on my local machine.<o:p></o:p></p>
<p class="MsoNormal">The wiki page <a href="https://gitlab.haskell.org/ghc/ghc/wikis/building/running-tests/performance-tests">
https://gitlab.haskell.org/ghc/ghc/wikis/building/running-tests/performance-tests</a> helps, but not enough!<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">There are two things going on:<o:p></o:p></li></ul>
<ul style="margin-top:0cm" type="disc">
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo3">CI perf measurements<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo3">Local machine perf measurements<o:p></o:p></li></ol>
</ul>
<p class="MsoListParagraph">I think that they are somehow handled differently (why?) but they are all muddled up on the wiki page.<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">My goal is this:
<o:p></o:p></li></ul>
<ul style="margin-top:0cm" type="disc">
<ul style="margin-top:0cm" type="circle">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level2 lfo2">Start with a master commit, say from Dec 2019.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level2 lfo2">Implement some change, on a branch.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level2 lfo2">sh validate –legacy (or something else if you like)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level2 lfo2">Look at perf regressions.<o:p></o:p></li></ul>
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo2">I believe I have first to utter the incantation<o:p></o:p></li></ul>
<p class="MsoNormal" style="margin-left:72.0pt"><span class="line"><span style="font-size:10.0pt;font-family:"Courier New"">$ git fetch https://gitlab.haskell.org/ghc/ghc-performance-notes.git refs/notes/perf:refs/notes/ci/perf<o:p></o:p></span></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo2">But then:<o:p></o:p></li><ul style="margin-top:0cm" type="circle">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level2 lfo2">How do I ensure that the baseline perf numbers I get relate to the master commit I started from, back in Dec 2019? I don’t want numbers from Jan 2020.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level2 lfo2">If I rebase my branch on top of HEAD, say, how do I update the perf baseline numbers to be for HEAD?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level2 lfo2">Generally, how can I tell the commit to which the baseline numbers relate?<o:p></o:p></li></ul>
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo2">Also, in my tree I have a series of incremental changes; I want to see if any of them have perf regressions. How do I do that?<o:p></o:p></li></ul>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
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