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