265 lines
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<main>
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<h1 id="performance-testing"><a class="header" href="#performance-testing">Performance testing</a></h1>
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<h2 id="rustc-perf"><a class="header" href="#rustc-perf">rustc-perf</a></h2>
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<p>A lot of work is put into improving the performance of the compiler and
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preventing performance regressions.</p>
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<p>The <a href="https://github.com/rust-lang/rustc-perf">rustc-perf</a> project provides
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several services for testing and tracking performance. It provides hosted
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infrastructure for running benchmarks as a service. At this time, only
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<code>x86_64-unknown-linux-gnu</code> builds are tracked.</p>
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<p>A "perf run" is used to compare the performance of the compiler in different
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configurations for a large collection of popular crates. Different
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configurations include "fresh builds", builds with incremental compilation, etc.</p>
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<p>The result of a perf run is a comparison between two versions of the compiler
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(by their commit hashes).</p>
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<p>You can also use <code>rustc-perf</code> to manually benchmark and profile the compiler
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<a href="../profiling/with_rustc_perf.html">locally</a>.</p>
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<h3 id="automatic-perf-runs"><a class="header" href="#automatic-perf-runs">Automatic perf runs</a></h3>
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<p>After every PR is merged, a suite of benchmarks are run against the compiler.
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The results are tracked over time on the <a href="https://perf.rust-lang.org/">https://perf.rust-lang.org/</a> website.
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Any changes are noted in a comment on the PR.</p>
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<h3 id="manual-perf-runs"><a class="header" href="#manual-perf-runs">Manual perf runs</a></h3>
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<p>Additionally, performance tests can be ran before a PR is merged on an as-needed
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basis. You should request a perf run if your PR may affect performance,
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especially if it can affect performance adversely.</p>
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<p>To evaluate the performance impact of a PR, write this comment on the PR:</p>
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<p><code>@bors try @rust-timer queue</code></p>
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<blockquote>
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<p><strong>Note</strong>: Only users authorized to do perf runs are allowed to post this
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comment. Teams that are allowed to use it are tracked in the <a href="https://github.com/rust-lang/team">Teams
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repository</a> with the <code>perf = true</code> value in
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the <code>[permissions]</code> section (and bors permissions are also required). If you
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are not on one of those teams, feel free to ask for someone to post it for you
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(either on Zulip or ask the assigned reviewer).</p>
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</blockquote>
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<p>This will first tell bors to do a "try" build which do a full release build for
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<code>x86_64-unknown-linux-gnu</code>. After the build finishes, it will place it in the
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queue to run the performance suite against it. After the performance tests
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finish, the bot will post a comment on the PR with a summary and a link to a
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full report.</p>
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<p>If you want to do a perf run for an already built artifact (e.g. for a previous
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try build that wasn't benchmarked yet), you can run this instead:</p>
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<p><code>@rust-timer build <commit-sha></code></p>
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<p>You cannot benchmark the same artifact twice though.</p>
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<p>More information about the available perf bot commands can be found
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<a href="https://perf.rust-lang.org/help.html">here</a>.</p>
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<p>More details about the benchmarking process itself are available in the <a href="https://github.com/rust-lang/rustc-perf/blob/master/collector/README.md">perf
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collector
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documentation</a>.</p>
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