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| <h1 id="profiling-with-rustc-perf"><a class="header" href="#profiling-with-rustc-perf">Profiling with rustc-perf</a></h1> |
| <p>The <a href="https://github.com/rust-lang/rustc-perf">Rust benchmark suite</a> provides a comprehensive way of profiling and benchmarking |
| the Rust compiler. You can find instructions on how to use the suite in its <a href="https://github.com/rust-lang/rustc-perf/blob/master/collector/README.md">manual</a>.</p> |
| <p>However, using the suite manually can be a bit cumbersome. To make this easier for <code>rustc</code> contributors, |
| the compiler build system (<code>bootstrap</code>) also provides built-in integration with the benchmarking suite, |
| which will download and build the suite for you, build a local compiler toolchain and let you profile it using a simplified command-line interface.</p> |
| <p>You can use the <code>./x perf <command> [options]</code> command to use this integration.</p> |
| <p>You can use normal bootstrap flags for this command, such as <code>--stage 1</code> or <code>--stage 2</code>, for example to modify the stage of the created sysroot. It might also be useful to configure <code>bootstrap.toml</code> to better support profiling, e.g. set <code>rust.debuginfo-level = 1</code> to add source line information to the built compiler.</p> |
| <p><code>x perf</code> currently supports the following commands:</p> |
| <ul> |
| <li><code>benchmark <id></code>: Benchmark the compiler and store the results under the passed <code>id</code>.</li> |
| <li><code>compare <baseline> <modified></code>: Compare the benchmark results of two compilers with the two passed <code>id</code>s.</li> |
| <li><code>eprintln</code>: Just run the compiler and capture its <code>stderr</code> output. Note that the compiler normally does not print |
| anything to <code>stderr</code>, you might want to add some <code>eprintln!</code> calls to get any output.</li> |
| <li><code>samply</code>: Profile the compiler using the <a href="https://github.com/mstange/samply">samply</a> sampling profiler.</li> |
| <li><code>cachegrind</code>: Use <a href="https://www.cs.cmu.edu/afs/cs.cmu.edu/project/cmt-40/Nice/RuleRefinement/bin/valgrind-3.2.0/docs/html/cg-manual.html">Cachegrind</a> to generate a detailed simulated trace of the compiler's execution.</li> |
| </ul> |
| <blockquote> |
| <p>You can find a more detailed description of the profilers in the <a href="https://github.com/rust-lang/rustc-perf/blob/master/collector/README.md#profiling-local-builds"><code>rustc-perf</code> manual</a>.</p> |
| </blockquote> |
| <p>You can use the following options for the <code>x perf</code> command, which mirror the corresponding options of the |
| <code>profile_local</code> and <code>bench_local</code> commands that you can use in the suite:</p> |
| <ul> |
| <li><code>--include</code>: Select benchmarks which should be profiled/benchmarked.</li> |
| <li><code>--profiles</code>: Select profiles (<code>Check</code>, <code>Debug</code>, <code>Opt</code>, <code>Doc</code>) which should be profiled/benchmarked.</li> |
| <li><code>--scenarios</code>: Select scenarios (<code>Full</code>, <code>IncrFull</code>, <code>IncrPatched</code>, <code>IncrUnchanged</code>) which should be profiled/benchmarked.</li> |
| </ul> |
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