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<div class="WordSection1">
<p class="MsoNormal">David<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks. Concerning this:<o:p></o:p></p>
<ol start="1" type="1">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 lfo5">
Checkout an the <baseline> commit.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 lfo5">
Use `git status` to double check git sees a clean working tree.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 lfo5">
Run the performance tests.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 lfo5">
Check out your <target> branch.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 lfo5">
Use `git status` to double check git sees a clean working tree (else commit any changes)<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 lfo5">
Run the performance tests.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 lfo5">
Compare metrics (filtering for `local` metrics and outputting a chart):<o:p></o:p></li></ol>
<p> <code><span style="font-size:10.0pt">python3 testsuite/driver/perf_notes.py --chart chart.html --test-env local <baseline> <target></span></code><o:p></o:p></p>
<p class="MsoNormal">I believe that<o:p></o:p></p>
<ul type="disc">
<li class="MsoListParagraph" style="mso-list:l3 level1 lfo12">This compares two local builds<o:p></o:p></li><li class="MsoListParagraph" style="mso-list:l3 level1 lfo12">It does not require fetching CI perf data; in fact it 100% independent of the CI system<o:p></o:p></li><li class="MsoListParagraph" style="mso-list:l3 level1 lfo12">It does require two separate build trees (that is fine)<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is that right? If so, two questions<o:p></o:p></p>
<ul type="disc">
<li class="MsoListParagraph" style="mso-list:l3 level1 lfo12">In that Python command line (step 7) is “<baseline>” the path to the root of the baseline tree, or to some file within that tree?<o:p></o:p></li><li class="MsoListParagraph" style="mso-list:l3 level1 lfo12">Is this process (and what it does) written up on some wiki page somewhere? Where? Rather than replying to me individually, it’d be better to use this conversation to produce better guidance for
everyone.<o:p></o:p></li></ul>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> David Eichmann <davide@well-typed.com>
<br>
<b>Sent:</b> 20 January 2020 10:37<br>
<b>To:</b> Simon Peyton Jones <simonpj@microsoft.com>; Ben Gamari <ben@well-typed.com><br>
<b>Cc:</b> ghc-devs <ghc-devs@haskell.org><br>
<b>Subject:</b> Re: GHC perf<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Simon, <o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<ul type="disc">
<li class="MsoListParagraph" style="mso-list:l5 level1 lfo1">There are two things going on:<o:p></o:p></li></ul>
<ul type="disc">
<ol start="1" type="1">
<li class="MsoListParagraph" style="mso-list:l0 level2 lfo2">CI perf measurements<o:p></o:p></li><li class="MsoListParagraph" style="mso-list:l0 level2 lfo2">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>
</div>
</blockquote>
<p>They are handled differently because we do not want to compare local metrics with CI metrics. The exception is when local metrics don't exist, then we fall back to CI metrics as a baseline (see
<a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.haskell.org%2Fghc%2Fghc%2Fwikis%2Fbuilding%2Frunning-tests%2Fperformance-tests%23how-baselines-are-calculated&data=02%7C01%7Csimonpj%40microsoft.com%7C9e4791b55f04431b01dc08d79d94bb10%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637151134459159958&sdata=2DY113CCr95GoBXrWRNn%2BiuP7F7mh3LMW3IUyQ69WQI%3D&reserved=0">
How baseline metrics are calculated</a>).<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<ul type="disc">
<li class="MsoListParagraph" style="mso-list:l6 level1 lfo3">My goal is this: <o:p>
</o:p></li></ul>
<ul type="disc">
<ul type="circle">
<li class="MsoListParagraph" style="mso-list:l2 level2 lfo4">Start with a master commit, say from Dec 2019.<o:p></o:p></li><li class="MsoListParagraph" style="mso-list:l2 level2 lfo4">Implement some change, on a branch.<o:p></o:p></li><li class="MsoListParagraph" style="mso-list:l2 level2 lfo4">sh validate –legacy (or something else if you like)<o:p></o:p></li><li class="MsoListParagraph" style="mso-list:l2 level2 lfo4">Look at perf regressions.<o:p></o:p></li></ul>
</ul>
</div>
</blockquote>
<p class="MsoNormal">Getting to the *raw data* should be easy: <o:p></o:p></p>
<ol start="1" type="1">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo11">
Checkout an the <baseline> commit.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo11">
Use `git status` to double check git sees a clean working tree.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo11">
Run the performance tests.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo11">
Check out your <target> branch.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo11">
Use `git status` to double check git sees a clean working tree (else commit any changes)<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo11">
Run the performance tests.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo11">
Compare metrics (filtering for `local` metrics and outputting a chart):<o:p></o:p></li></ol>
<p> <code><span style="font-size:10.0pt">python3 testsuite/driver/perf_notes.py --chart chart.html --test-env local <baseline> <target></span></code><o:p></o:p></p>
<p class="MsoNormal">see `<code><span style="font-size:10.0pt">python3 testsuite/driver/perf_notes.py --help`</span></code> for more filtering options. This doesn't detect regressions automatically, it only shows you the raw data. Ideally we'd add an option
to the testrunner to let you specify a baseline commit manually. I suspect that would be close to what you're looking for.<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<ul type="disc">
<li class="MsoListParagraph" style="mso-list:l4 level1 lfo6">I believe I have first to utter the incantation<o:p></o:p></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:72.0pt">
<span class="line"><span style="font-size:10.0pt;font-family:"Courier New",serif">$ git fetch
<a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.haskell.org%2Fghc%2Fghc-performance-notes.git&data=02%7C01%7Csimonpj%40microsoft.com%7C9e4791b55f04431b01dc08d79d94bb10%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637151134459159958&sdata=BnUJJCvEJIsiFHQPfS%2BNQqG%2Bxi6rmXebOllH%2BGHbkMI%3D&reserved=0">
https://gitlab.haskell.org/ghc/ghc-performance-notes.git</a> refs/notes/perf:refs/notes/ci/perf</span></span><o:p></o:p></p>
</div>
</blockquote>
<p class="MsoNormal">Yes, this fetches the latest CI metrics into your git notes.<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<ul type="disc">
<li class="MsoListParagraph" style="mso-list:l10 level1 lfo7">But then:<o:p></o:p></li></ul>
<ul type="disc">
<ul type="circle">
<li class="MsoListParagraph" style="mso-list:l10 level2 lfo7">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></ul>
</ul>
</div>
</blockquote>
<p class="MsoNormal">see above.<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<ul type="disc">
<ul type="circle">
<li class="MsoListParagraph" style="mso-list:l11 level2 lfo8">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></ul>
</ul>
</div>
</blockquote>
<p class="MsoNormal">The test runner should use HEAD's metrics automatically (see
<a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.haskell.org%2Fghc%2Fghc%2Fwikis%2Fbuilding%2Frunning-tests%2Fperformance-tests%23how-baselines-are-calculated&data=02%7C01%7Csimonpj%40microsoft.com%7C9e4791b55f04431b01dc08d79d94bb10%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637151134459159958&sdata=2DY113CCr95GoBXrWRNn%2BiuP7F7mh3LMW3IUyQ69WQI%3D&reserved=0">
How baseline metrics are calculated</a>), though you will need to fetch CI metrics or run the perf tests locally on HEAD to get the relevant metrics.<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<ul type="disc">
<ul type="circle">
<li class="MsoListParagraph" style="mso-list:l9 level2 lfo9">Generally, how can I tell the commit to which the baseline numbers relate?<o:p></o:p></li></ul>
</ul>
</div>
</blockquote>
<p class="MsoNormal">The test runner will output (per test) which baseline commit is used e.g. "... from local
<o:p></o:p></p>
<div>
<p class="MsoNormal"><span style="color:black">baseline @ HEAD~2" says the baseline was a local run from 2 commits ago.</span><o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<ul type="disc">
<li class="MsoListParagraph" style="mso-list:l1 level1 lfo10">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>
</div>
</blockquote>
<p>You can run the perf tests on each commit *in commit order*, and the previous commit will always be used as the baseline. You can also then chart the results:<o:p></o:p></p>
<p> <code><span style="font-size:10.0pt">python3 testsuite/driver/perf_notes.py --chart chart.html --test-env local <oldestCommit>..<newestCommit></span></code><o:p></o:p></p>
<p>Sorry if this is a bit unoptimal, but I Hope that helps<o:p></o:p></p>
<p>- David E<o:p></o:p></p>
<p><o:p> </o:p></p>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>-- <o:p></o:p></pre>
<pre>David Eichmann, Haskell Consultant<o:p></o:p></pre>
<pre>Well-Typed LLP, <a href="https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.well-typed.com%2F&data=02%7C01%7Csimonpj%40microsoft.com%7C9e4791b55f04431b01dc08d79d94bb10%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637151134459169953&sdata=dkT1dY8PgSZNGd%2FVJUV0fB%2B563emRy5MNtZFxAsLCn8%3D&reserved=0">http://www.well-typed.com</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Registered in England & Wales, OC335890<o:p></o:p></pre>
<pre>118 Wymering Mansions, Wymering Road, London W9 2NF, England <o:p></o:p></pre>
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