mirror of https://github.com/rust-lang/cargo
560 lines
20 KiB
Groff
560 lines
20 KiB
Groff
'\" t
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.TH "CARGO\-BENCH" "1"
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.nh
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.ad l
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.ss \n[.ss] 0
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.SH "NAME"
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cargo\-bench \[em] Execute benchmarks of a package
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.SH "SYNOPSIS"
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\fBcargo bench\fR [\fIoptions\fR] [\fIbenchname\fR] [\fB\-\-\fR \fIbench\-options\fR]
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.SH "DESCRIPTION"
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Compile and execute benchmarks.
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.sp
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The benchmark filtering argument \fIbenchname\fR and all the arguments following
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the two dashes (\fB\-\-\fR) are passed to the benchmark binaries and thus to
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\fIlibtest\fR (rustc\[cq]s built in unit\-test and micro\-benchmarking framework). If
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you are passing arguments to both Cargo and the binary, the ones after \fB\-\-\fR go
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to the binary, the ones before go to Cargo. For details about libtest\[cq]s
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arguments see the output of \fBcargo bench \-\- \-\-help\fR and check out the rustc
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book\[cq]s chapter on how tests work at
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<https://doc.rust\-lang.org/rustc/tests/index.html>\&.
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.sp
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As an example, this will run only the benchmark named \fBfoo\fR (and skip other
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similarly named benchmarks like \fBfoobar\fR):
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.sp
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.RS 4
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.nf
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cargo bench \-\- foo \-\-exact
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.fi
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.RE
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.sp
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Benchmarks are built with the \fB\-\-test\fR option to \fBrustc\fR which creates a
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special executable by linking your code with libtest. The executable
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automatically runs all functions annotated with the \fB#[bench]\fR attribute.
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Cargo passes the \fB\-\-bench\fR flag to the test harness to tell it to run
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only benchmarks, regardless of whether the harness is libtest or a custom harness.
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.sp
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The libtest harness may be disabled by setting \fBharness = false\fR in the target
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manifest settings, in which case your code will need to provide its own \fBmain\fR
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function to handle running benchmarks.
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.RS 3
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.ll -5
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.sp
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\fBNote\fR: The
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\fI\f(BI#[bench]\fI attribute\fR <https://doc.rust\-lang.org/nightly/unstable\-book/library\-features/test.html>
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is currently unstable and only available on the
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\fInightly channel\fR <https://doc.rust\-lang.org/book/appendix\-07\-nightly\-rust.html>\&.
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There are some packages available on
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\fIcrates.io\fR <https://crates.io/keywords/benchmark> that may help with
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running benchmarks on the stable channel, such as
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\fICriterion\fR <https://crates.io/crates/criterion>\&.
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.br
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.RE
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.ll
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.sp
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By default, \fBcargo bench\fR uses the \fI\f(BIbench\fI profile\fR <https://doc.rust\-lang.org/cargo/reference/profiles.html#bench>, which enables
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optimizations and disables debugging information. If you need to debug a
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benchmark, you can use the \fB\-\-profile=dev\fR command\-line option to switch to
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the dev profile. You can then run the debug\-enabled benchmark within a
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debugger.
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.SS "Working directory of benchmarks"
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The working directory of every benchmark is set to the root directory of the
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package the benchmark belongs to.
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Setting the working directory of benchmarks to the package\[cq]s root directory
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makes it possible for benchmarks to reliably access the package\[cq]s files using
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relative paths, regardless from where \fBcargo bench\fR was executed from.
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.SH "OPTIONS"
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.SS "Benchmark Options"
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.sp
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\fB\-\-no\-run\fR
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.RS 4
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Compile, but don\[cq]t run benchmarks.
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.RE
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.sp
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\fB\-\-no\-fail\-fast\fR
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.RS 4
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Run all benchmarks regardless of failure. Without this flag, Cargo will exit
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after the first executable fails. The Rust test harness will run all benchmarks
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within the executable to completion, this flag only applies to the executable
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as a whole.
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.RE
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.SS "Package Selection"
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By default, when no package selection options are given, the packages selected
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depend on the selected manifest file (based on the current working directory if
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\fB\-\-manifest\-path\fR is not given). If the manifest is the root of a workspace then
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the workspaces default members are selected, otherwise only the package defined
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by the manifest will be selected.
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.sp
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The default members of a workspace can be set explicitly with the
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\fBworkspace.default\-members\fR key in the root manifest. If this is not set, a
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virtual workspace will include all workspace members (equivalent to passing
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\fB\-\-workspace\fR), and a non\-virtual workspace will include only the root crate itself.
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.sp
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\fB\-p\fR \fIspec\fR\[u2026],
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\fB\-\-package\fR \fIspec\fR\[u2026]
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.RS 4
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Benchmark only the specified packages. See \fBcargo\-pkgid\fR(1) for the
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SPEC format. This flag may be specified multiple times and supports common Unix
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glob patterns like \fB*\fR, \fB?\fR and \fB[]\fR\&. However, to avoid your shell accidentally
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expanding glob patterns before Cargo handles them, you must use single quotes or
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double quotes around each pattern.
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.RE
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.sp
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\fB\-\-workspace\fR
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.RS 4
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Benchmark all members in the workspace.
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.RE
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.sp
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\fB\-\-all\fR
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.RS 4
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Deprecated alias for \fB\-\-workspace\fR\&.
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.RE
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.sp
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\fB\-\-exclude\fR \fISPEC\fR\[u2026]
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.RS 4
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Exclude the specified packages. Must be used in conjunction with the
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\fB\-\-workspace\fR flag. This flag may be specified multiple times and supports
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common Unix glob patterns like \fB*\fR, \fB?\fR and \fB[]\fR\&. However, to avoid your shell
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accidentally expanding glob patterns before Cargo handles them, you must use
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single quotes or double quotes around each pattern.
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.RE
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.SS "Target Selection"
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When no target selection options are given, \fBcargo bench\fR will build the
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following targets of the selected packages:
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'lib \[em] used to link with binaries and benchmarks
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'bins (only if benchmark targets are built and required features are
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available)
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'lib as a benchmark
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'bins as benchmarks
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'benchmark targets
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.RE
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.sp
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The default behavior can be changed by setting the \fBbench\fR flag for the target
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in the manifest settings. Setting examples to \fBbench = true\fR will build and
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run the example as a benchmark, replacing the example\[cq]s \fBmain\fR function with
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the libtest harness.
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.sp
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Setting targets to \fBbench = false\fR will stop them from being bencharmked by
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default. Target selection options that take a target by name (such as
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\fB\-\-example foo\fR) ignore the \fBbench\fR flag and will always benchmark the given
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target.
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.sp
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See \fIConfiguring a target\fR <https://doc.rust\-lang.org/cargo/reference/cargo\-targets.html#configuring\-a\-target>
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for more information on per\-target settings.
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.sp
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Binary targets are automatically built if there is an integration test or
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benchmark being selected to benchmark. This allows an integration
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test to execute the binary to exercise and test its behavior.
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The \fBCARGO_BIN_EXE_<name>\fR
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\fIenvironment variable\fR <https://doc.rust\-lang.org/cargo/reference/environment\-variables.html#environment\-variables\-cargo\-sets\-for\-crates>
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is set when the integration test is built so that it can use the
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\fI\f(BIenv\fI macro\fR <https://doc.rust\-lang.org/std/macro.env.html> to locate the
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executable.
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.sp
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Passing target selection flags will benchmark only the specified
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targets.
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.sp
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Note that \fB\-\-bin\fR, \fB\-\-example\fR, \fB\-\-test\fR and \fB\-\-bench\fR flags also
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support common Unix glob patterns like \fB*\fR, \fB?\fR and \fB[]\fR\&. However, to avoid your
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shell accidentally expanding glob patterns before Cargo handles them, you must
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use single quotes or double quotes around each glob pattern.
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.sp
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\fB\-\-lib\fR
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.RS 4
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Benchmark the package\[cq]s library.
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.RE
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.sp
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\fB\-\-bin\fR \fIname\fR\[u2026]
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.RS 4
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Benchmark the specified binary. This flag may be specified multiple times
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and supports common Unix glob patterns.
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.RE
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.sp
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\fB\-\-bins\fR
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.RS 4
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Benchmark all binary targets.
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.RE
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.sp
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\fB\-\-example\fR \fIname\fR\[u2026]
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.RS 4
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Benchmark the specified example. This flag may be specified multiple times
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and supports common Unix glob patterns.
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.RE
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.sp
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\fB\-\-examples\fR
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.RS 4
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Benchmark all example targets.
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.RE
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.sp
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\fB\-\-test\fR \fIname\fR\[u2026]
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.RS 4
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Benchmark the specified integration test. This flag may be specified
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multiple times and supports common Unix glob patterns.
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.RE
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.sp
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\fB\-\-tests\fR
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.RS 4
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Benchmark all targets in test mode that have the \fBtest = true\fR manifest
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flag set. By default this includes the library and binaries built as
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unittests, and integration tests. Be aware that this will also build any
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required dependencies, so the lib target may be built twice (once as a
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unittest, and once as a dependency for binaries, integration tests, etc.).
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Targets may be enabled or disabled by setting the \fBtest\fR flag in the
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manifest settings for the target.
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.RE
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.sp
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\fB\-\-bench\fR \fIname\fR\[u2026]
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.RS 4
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Benchmark the specified benchmark. This flag may be specified multiple
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times and supports common Unix glob patterns.
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.RE
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.sp
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\fB\-\-benches\fR
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.RS 4
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Benchmark all targets in benchmark mode that have the \fBbench = true\fR
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manifest flag set. By default this includes the library and binaries built
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as benchmarks, and bench targets. Be aware that this will also build any
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required dependencies, so the lib target may be built twice (once as a
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benchmark, and once as a dependency for binaries, benchmarks, etc.).
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Targets may be enabled or disabled by setting the \fBbench\fR flag in the
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manifest settings for the target.
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.RE
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.sp
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\fB\-\-all\-targets\fR
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.RS 4
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Benchmark all targets. This is equivalent to specifying \fB\-\-lib \-\-bins \-\-tests \-\-benches \-\-examples\fR\&.
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.RE
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.SS "Feature Selection"
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The feature flags allow you to control which features are enabled. When no
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feature options are given, the \fBdefault\fR feature is activated for every
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selected package.
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.sp
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See \fIthe features documentation\fR <https://doc.rust\-lang.org/cargo/reference/features.html#command\-line\-feature\-options>
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for more details.
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.sp
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\fB\-F\fR \fIfeatures\fR,
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\fB\-\-features\fR \fIfeatures\fR
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.RS 4
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Space or comma separated list of features to activate. Features of workspace
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members may be enabled with \fBpackage\-name/feature\-name\fR syntax. This flag may
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be specified multiple times, which enables all specified features.
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.RE
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.sp
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\fB\-\-all\-features\fR
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.RS 4
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Activate all available features of all selected packages.
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.RE
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.sp
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\fB\-\-no\-default\-features\fR
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.RS 4
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Do not activate the \fBdefault\fR feature of the selected packages.
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.RE
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.SS "Compilation Options"
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.sp
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\fB\-\-target\fR \fItriple\fR
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.RS 4
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Benchmark for the given architecture. The default is the host architecture. The general format of the triple is
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\fB<arch><sub>\-<vendor>\-<sys>\-<abi>\fR\&. Run \fBrustc \-\-print target\-list\fR for a
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list of supported targets. This flag may be specified multiple times.
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.sp
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This may also be specified with the \fBbuild.target\fR
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\fIconfig value\fR <https://doc.rust\-lang.org/cargo/reference/config.html>\&.
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.sp
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Note that specifying this flag makes Cargo run in a different mode where the
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target artifacts are placed in a separate directory. See the
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\fIbuild cache\fR <https://doc.rust\-lang.org/cargo/guide/build\-cache.html> documentation for more details.
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.RE
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.sp
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\fB\-\-profile\fR \fIname\fR
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.RS 4
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Benchmark with the given profile.
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See \fIthe reference\fR <https://doc.rust\-lang.org/cargo/reference/profiles.html> for more details on profiles.
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.RE
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.sp
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\fB\-\-timings=\fR\fIfmts\fR
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.RS 4
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Output information how long each compilation takes, and track concurrency
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information over time. Accepts an optional comma\-separated list of output
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formats; \fB\-\-timings\fR without an argument will default to \fB\-\-timings=html\fR\&.
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Specifying an output format (rather than the default) is unstable and requires
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\fB\-Zunstable\-options\fR\&. Valid output formats:
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'\fBhtml\fR (unstable, requires \fB\-Zunstable\-options\fR): Write a human\-readable file \fBcargo\-timing.html\fR to the
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\fBtarget/cargo\-timings\fR directory with a report of the compilation. Also write
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a report to the same directory with a timestamp in the filename if you want
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to look at older runs. HTML output is suitable for human consumption only,
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and does not provide machine\-readable timing data.
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'\fBjson\fR (unstable, requires \fB\-Zunstable\-options\fR): Emit machine\-readable JSON
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information about timing information.
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.RE
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.RE
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.SS "Output Options"
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.sp
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\fB\-\-target\-dir\fR \fIdirectory\fR
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.RS 4
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Directory for all generated artifacts and intermediate files. May also be
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specified with the \fBCARGO_TARGET_DIR\fR environment variable, or the
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\fBbuild.target\-dir\fR \fIconfig value\fR <https://doc.rust\-lang.org/cargo/reference/config.html>\&.
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Defaults to \fBtarget\fR in the root of the workspace.
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.RE
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.SS "Display Options"
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By default the Rust test harness hides output from benchmark execution to keep
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results readable. Benchmark output can be recovered (e.g., for debugging) by
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passing \fB\-\-nocapture\fR to the benchmark binaries:
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.sp
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.RS 4
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.nf
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cargo bench \-\- \-\-nocapture
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.fi
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.RE
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.sp
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\fB\-v\fR,
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\fB\-\-verbose\fR
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.RS 4
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Use verbose output. May be specified twice for \[lq]very verbose\[rq] output which
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includes extra output such as dependency warnings and build script output.
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May also be specified with the \fBterm.verbose\fR
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\fIconfig value\fR <https://doc.rust\-lang.org/cargo/reference/config.html>\&.
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.RE
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.sp
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\fB\-q\fR,
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\fB\-\-quiet\fR
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.RS 4
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Do not print cargo log messages.
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May also be specified with the \fBterm.quiet\fR
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\fIconfig value\fR <https://doc.rust\-lang.org/cargo/reference/config.html>\&.
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.RE
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.sp
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\fB\-\-color\fR \fIwhen\fR
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.RS 4
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Control when colored output is used. Valid values:
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'\fBauto\fR (default): Automatically detect if color support is available on the
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terminal.
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'\fBalways\fR: Always display colors.
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'\fBnever\fR: Never display colors.
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.RE
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.sp
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May also be specified with the \fBterm.color\fR
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\fIconfig value\fR <https://doc.rust\-lang.org/cargo/reference/config.html>\&.
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.RE
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.sp
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\fB\-\-message\-format\fR \fIfmt\fR
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.RS 4
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The output format for diagnostic messages. Can be specified multiple times
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and consists of comma\-separated values. Valid values:
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'\fBhuman\fR (default): Display in a human\-readable text format. Conflicts with
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\fBshort\fR and \fBjson\fR\&.
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'\fBshort\fR: Emit shorter, human\-readable text messages. Conflicts with \fBhuman\fR
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and \fBjson\fR\&.
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'\fBjson\fR: Emit JSON messages to stdout. See
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\fIthe reference\fR <https://doc.rust\-lang.org/cargo/reference/external\-tools.html#json\-messages>
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for more details. Conflicts with \fBhuman\fR and \fBshort\fR\&.
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'\fBjson\-diagnostic\-short\fR: Ensure the \fBrendered\fR field of JSON messages contains
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the \[lq]short\[rq] rendering from rustc. Cannot be used with \fBhuman\fR or \fBshort\fR\&.
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'\fBjson\-diagnostic\-rendered\-ansi\fR: Ensure the \fBrendered\fR field of JSON messages
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contains embedded ANSI color codes for respecting rustc\[cq]s default color
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scheme. Cannot be used with \fBhuman\fR or \fBshort\fR\&.
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'\fBjson\-render\-diagnostics\fR: Instruct Cargo to not include rustc diagnostics
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in JSON messages printed, but instead Cargo itself should render the
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JSON diagnostics coming from rustc. Cargo\[cq]s own JSON diagnostics and others
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coming from rustc are still emitted. Cannot be used with \fBhuman\fR or \fBshort\fR\&.
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.RE
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.RE
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.SS "Manifest Options"
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.sp
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\fB\-\-manifest\-path\fR \fIpath\fR
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.RS 4
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Path to the \fBCargo.toml\fR file. By default, Cargo searches for the
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\fBCargo.toml\fR file in the current directory or any parent directory.
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.RE
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.sp
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\fB\-\-ignore\-rust\-version\fR
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.RS 4
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Ignore \fBrust\-version\fR specification in packages.
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.RE
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.sp
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\fB\-\-locked\fR
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.RS 4
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Asserts that the exact same dependencies and versions are used as when the
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existing \fBCargo.lock\fR file was originally generated. Cargo will exit with an
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error when either of the following scenarios arises:
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'The lock file is missing.
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.RE
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.sp
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.RS 4
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\h'-04'\(bu\h'+02'Cargo attempted to change the lock file due to a different dependency resolution.
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.RE
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.sp
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It may be used in environments where deterministic builds are desired,
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such as in CI pipelines.
|
|
.RE
|
|
.sp
|
|
\fB\-\-offline\fR
|
|
.RS 4
|
|
Prevents Cargo from accessing the network for any reason. Without this
|
|
flag, Cargo will stop with an error if it needs to access the network and
|
|
the network is not available. With this flag, Cargo will attempt to
|
|
proceed without the network if possible.
|
|
.sp
|
|
Beware that this may result in different dependency resolution than online
|
|
mode. Cargo will restrict itself to crates that are downloaded locally, even
|
|
if there might be a newer version as indicated in the local copy of the index.
|
|
See the \fBcargo\-fetch\fR(1) command to download dependencies before going
|
|
offline.
|
|
.sp
|
|
May also be specified with the \fBnet.offline\fR \fIconfig value\fR <https://doc.rust\-lang.org/cargo/reference/config.html>\&.
|
|
.RE
|
|
.sp
|
|
\fB\-\-frozen\fR
|
|
.RS 4
|
|
Equivalent to specifying both \fB\-\-locked\fR and \fB\-\-offline\fR\&.
|
|
.RE
|
|
.SS "Common Options"
|
|
.sp
|
|
\fB+\fR\fItoolchain\fR
|
|
.RS 4
|
|
If Cargo has been installed with rustup, and the first argument to \fBcargo\fR
|
|
begins with \fB+\fR, it will be interpreted as a rustup toolchain name (such
|
|
as \fB+stable\fR or \fB+nightly\fR).
|
|
See the \fIrustup documentation\fR <https://rust\-lang.github.io/rustup/overrides.html>
|
|
for more information about how toolchain overrides work.
|
|
.RE
|
|
.sp
|
|
\fB\-\-config\fR \fIKEY=VALUE\fR or \fIPATH\fR
|
|
.RS 4
|
|
Overrides a Cargo configuration value. The argument should be in TOML syntax of \fBKEY=VALUE\fR,
|
|
or provided as a path to an extra configuration file. This flag may be specified multiple times.
|
|
See the \fIcommand\-line overrides section\fR <https://doc.rust\-lang.org/cargo/reference/config.html#command\-line\-overrides> for more information.
|
|
.RE
|
|
.sp
|
|
\fB\-C\fR \fIPATH\fR
|
|
.RS 4
|
|
Changes the current working directory before executing any specified operations. This affects
|
|
things like where cargo looks by default for the project manifest (\fBCargo.toml\fR), as well as
|
|
the directories searched for discovering \fB\&.cargo/config.toml\fR, for example. This option must
|
|
appear before the command name, for example \fBcargo \-C path/to/my\-project build\fR\&.
|
|
.sp
|
|
This option is only available on the \fInightly
|
|
channel\fR <https://doc.rust\-lang.org/book/appendix\-07\-nightly\-rust.html> and
|
|
requires the \fB\-Z unstable\-options\fR flag to enable (see
|
|
\fI#10098\fR <https://github.com/rust\-lang/cargo/issues/10098>).
|
|
.RE
|
|
.sp
|
|
\fB\-h\fR,
|
|
\fB\-\-help\fR
|
|
.RS 4
|
|
Prints help information.
|
|
.RE
|
|
.sp
|
|
\fB\-Z\fR \fIflag\fR
|
|
.RS 4
|
|
Unstable (nightly\-only) flags to Cargo. Run \fBcargo \-Z help\fR for details.
|
|
.RE
|
|
.SS "Miscellaneous Options"
|
|
The \fB\-\-jobs\fR argument affects the building of the benchmark executable but
|
|
does not affect how many threads are used when running the benchmarks. The
|
|
Rust test harness runs benchmarks serially in a single thread.
|
|
.sp
|
|
\fB\-j\fR \fIN\fR,
|
|
\fB\-\-jobs\fR \fIN\fR
|
|
.RS 4
|
|
Number of parallel jobs to run. May also be specified with the
|
|
\fBbuild.jobs\fR \fIconfig value\fR <https://doc.rust\-lang.org/cargo/reference/config.html>\&. Defaults to
|
|
the number of logical CPUs. If negative, it sets the maximum number of
|
|
parallel jobs to the number of logical CPUs plus provided value. If
|
|
a string \fBdefault\fR is provided, it sets the value back to defaults.
|
|
Should not be 0.
|
|
.RE
|
|
.sp
|
|
While \fBcargo bench\fR involves compilation, it does not provide a \fB\-\-keep\-going\fR
|
|
flag. Use \fB\-\-no\-fail\-fast\fR to run as many benchmarks as possible without
|
|
stopping at the first failure. To \[lq]compile\[rq] as many benchmarks as possible, use
|
|
\fB\-\-benches\fR to build benchmark binaries separately. For example:
|
|
.sp
|
|
.RS 4
|
|
.nf
|
|
cargo build \-\-benches \-\-release \-\-keep\-going
|
|
cargo bench \-\-no\-fail\-fast
|
|
.fi
|
|
.RE
|
|
.SH "ENVIRONMENT"
|
|
See \fIthe reference\fR <https://doc.rust\-lang.org/cargo/reference/environment\-variables.html> for
|
|
details on environment variables that Cargo reads.
|
|
.SH "EXIT STATUS"
|
|
.sp
|
|
.RS 4
|
|
\h'-04'\(bu\h'+02'\fB0\fR: Cargo succeeded.
|
|
.RE
|
|
.sp
|
|
.RS 4
|
|
\h'-04'\(bu\h'+02'\fB101\fR: Cargo failed to complete.
|
|
.RE
|
|
.SH "EXAMPLES"
|
|
.sp
|
|
.RS 4
|
|
\h'-04' 1.\h'+01'Build and execute all the benchmarks of the current package:
|
|
.sp
|
|
.RS 4
|
|
.nf
|
|
cargo bench
|
|
.fi
|
|
.RE
|
|
.RE
|
|
.sp
|
|
.RS 4
|
|
\h'-04' 2.\h'+01'Run only a specific benchmark within a specific benchmark target:
|
|
.sp
|
|
.RS 4
|
|
.nf
|
|
cargo bench \-\-bench bench_name \-\- modname::some_benchmark
|
|
.fi
|
|
.RE
|
|
.RE
|
|
.SH "SEE ALSO"
|
|
\fBcargo\fR(1), \fBcargo\-test\fR(1)
|