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cargo-bench(1)                                                  cargo-bench(1)




NAME

       cargo-bench - Execute benchmarks of a package


SYNOPSIS

       cargo bench [options] [benchname] [-- bench-options]


DESCRIPTION

       Compile and execute benchmarks.

       The benchmark filtering argument benchname and all the arguments
       following the two dashes (--) are passed to the benchmark binaries and
       thus to libtest (rustc's built in unit-test and micro-benchmarking
       framework). If you are passing arguments to both Cargo and the binary,
       the ones after -- go to the binary, the ones before go to Cargo. For
       details about libtest's arguments see the output of cargo bench --
       --help. As an example, this will run only the benchmark named foo (and
       skip other similarly named benchmarks like foobar):

           cargo bench -- foo --exact

       Benchmarks are built with the --test option to rustc which creates an
       executable with a main function that automatically runs all functions
       annotated with the #[bench] attribute. Cargo passes the --bench flag to
       the test harness to tell it to run only benchmarks.

       The libtest harness may be disabled by setting harness = false in the
       target manifest settings, in which case your code will need to provide
       its own main function to handle running benchmarks.

          Note: The ##[[bbeenncchh]] attribute
          <https://doc.rust-lang.org/nightly/unstable-book/library-features/test.html>
          is currently unstable and only available on the nightly channel
          <https://doc.rust-lang.org/book/appendix-07-nightly-rust.html>.
          There are some packages available on crates.io
          <https://crates.io/keywords/benchmark> that may help with
          running benchmarks on the stable channel, such as Criterion
          <https://crates.io/crates/criterion>.


OPTIONS

   Benchmark Options
       --no-run
           Compile, but don't run benchmarks.

       --no-fail-fast
           Run all benchmarks regardless of failure. Without this flag, Cargo
           will exit after the first executable fails. The Rust test harness
           will run all benchmarks within the executable to completion, this
           flag only applies to the executable as a whole.

   Package Selection
       By default, when no package selection options are given, the packages
       selected depend on the selected manifest file (based on the current
       working directory if --manifest-path is not given). If the manifest is
       the root of a workspace then the workspaces default members are
       selected, otherwise only the package defined by the manifest will be
       selected.

       The default members of a workspace can be set explicitly with the
       workspace.default-members key in the root manifest. If this is not set,
       a virtual workspace will include all workspace members (equivalent to
       passing --workspace), and a non-virtual workspace will include only the
       root crate itself.

       -p spec..., --package spec...
           Benchmark only the specified packages. See cargo-pkgid(1) for the
           SPEC format. This flag may be specified multiple times and supports
           common Unix glob patterns like *, ? and []. However, to avoid your
           shell accidentally expanding glob patterns before Cargo handles
           them, you must use single quotes or double quotes around each
           pattern.

       --workspace
           Benchmark all members in the workspace.

       --all
           Deprecated alias for --workspace.

       --exclude SPEC...
           Exclude the specified packages. Must be used in conjunction with
           the --workspace flag. This flag may be specified multiple times and
           supports common Unix glob patterns like *, ? and []. However, to
           avoid your shell accidentally expanding glob patterns before Cargo
           handles them, you must use single quotes or double quotes around
           each pattern.

   Target Selection
       When no target selection options are given, cargo bench will build the
       following targets of the selected packages:

       o  lib -- used to link with binaries and benchmarks

       o  bins (only if benchmark targets are built and required features are
           available)

       o  lib as a benchmark

       o  bins as benchmarks

       o  benchmark targets

       The default behavior can be changed by setting the bench flag for the
       target in the manifest settings. Setting examples to bench = true will
       build and run the example as a benchmark. Setting targets to bench =
       false will stop them from being benchmarked by default. Target
       selection options that take a target by name ignore the bench flag and
       will always benchmark the given target.

       Passing target selection flags will benchmark only the specified
       targets.

       Note that --bin, --example, --test and --bench flags also support
       common Unix glob patterns like *, ? and []. However, to avoid your
       shell accidentally expanding glob patterns before Cargo handles them,
       you must use single quotes or double quotes around each glob pattern.

       --lib
           Benchmark the package's library.

       --bin name...
           Benchmark the specified binary. This flag may be specified multiple
           times and supports common Unix glob patterns.

       --bins
           Benchmark all binary targets.

       --example name...
           Benchmark the specified example. This flag may be specified
           multiple times and supports common Unix glob patterns.

       --examples
           Benchmark all example targets.

       --test name...
           Benchmark the specified integration test. This flag may be
           specified multiple times and supports common Unix glob patterns.

       --tests
           Benchmark all targets in test mode that have the test = true
           manifest flag set. By default this includes the library and
           binaries built as unittests, and integration tests. Be aware that
           this will also build any required dependencies, so the lib target
           may be built twice (once as a unittest, and once as a dependency
           for binaries, integration tests, etc.). Targets may be enabled or
           disabled by setting the test flag in the manifest settings for the
           target.

       --bench name...
           Benchmark the specified benchmark. This flag may be specified
           multiple times and supports common Unix glob patterns.

       --benches
           Benchmark all targets in benchmark mode that have the bench = true
           manifest flag set. By default this includes the library and
           binaries built as benchmarks, and bench targets. Be aware that this
           will also build any required dependencies, so the lib target may be
           built twice (once as a benchmark, and once as a dependency for
           binaries, benchmarks, etc.). Targets may be enabled or disabled by
           setting the bench flag in the manifest settings for the target.

       --all-targets
           Benchmark all targets. This is equivalent to specifying --lib
           --bins --tests --benches --examples.

   Feature Selection
       The feature flags allow you to control which features are enabled. When
       no feature options are given, the default feature is activated for
       every selected package.

       See the features documentation
       <https://doc.rust-lang.org/cargo/reference/features.html#command-line-feature-options>
       for more details.

       --features features
           Space or comma separated list of features to activate. Features of
           workspace members may be enabled with package-name/feature-name
           syntax. This flag may be specified multiple times, which enables
           all specified features.

       --all-features
           Activate all available features of all selected packages.

       --no-default-features
           Do not activate the default feature of the selected packages.

   Compilation Options
       --target triple
           Benchmark for the given architecture. The default is the host
           architecture. The general format of the triple is
           <arch><sub>-<vendor>-<sys>-<abi>. Run rustc --print target-list for
           a list of supported targets.

           This may also be specified with the build.target config value
           <https://doc.rust-lang.org/cargo/reference/config.html>.

           Note that specifying this flag makes Cargo run in a different mode
           where the target artifacts are placed in a separate directory. See
           the build cache
           <https://doc.rust-lang.org/cargo/guide/build-cache.html>
           documentation for more details.

   Output Options
       --target-dir directory
           Directory for all generated artifacts and intermediate files. May
           also be specified with the CARGO_TARGET_DIR environment variable,
           or the build.target-dir config value
           <https://doc.rust-lang.org/cargo/reference/config.html>. Defaults
           to target in the root of the workspace.

   Display Options
       By default the Rust test harness hides output from benchmark execution
       to keep results readable. Benchmark output can be recovered (e.g., for
       debugging) by passing --nocapture to the benchmark binaries:

           cargo bench -- --nocapture

       -v, --verbose
           Use verbose output. May be specified twice for "very verbose"
           output which includes extra output such as dependency warnings and
           build script output. May also be specified with the term.verbose
           config value
           <https://doc.rust-lang.org/cargo/reference/config.html>.

       -q, --quiet
           No output printed to stdout.

       --color when
           Control when colored output is used. Valid values:

           o  auto (default): Automatically detect if color support is
               available on the terminal.

           o  always: Always display colors.

           o  never: Never display colors.

           May also be specified with the term.color config value
           <https://doc.rust-lang.org/cargo/reference/config.html>.

       --message-format fmt
           The output format for diagnostic messages. Can be specified
           multiple times and consists of comma-separated values. Valid
           values:

           o  human (default): Display in a human-readable text format.

           o  short: Emit shorter, human-readable text messages.

           o  json: Emit JSON messages to stdout. See the reference
               <https://doc.rust-lang.org/cargo/reference/external-tools.html#json-messages>
               for more details.

           o  json-diagnostic-short: Ensure the rendered field of JSON
               messages contains the "short" rendering from rustc.

           o  json-diagnostic-rendered-ansi: Ensure the rendered field of JSON
               messages contains embedded ANSI color codes for respecting
               rustc's default color scheme.

           o  json-render-diagnostics: Instruct Cargo to not include rustc
               diagnostics in in JSON messages printed, but instead Cargo
               itself should render the JSON diagnostics coming from rustc.
               Cargo's own JSON diagnostics and others coming from rustc are
               still emitted.

   Manifest Options
       --manifest-path path
           Path to the Cargo.toml file. By default, Cargo searches for the
           Cargo.toml file in the current directory or any parent directory.

       --frozen, --locked
           Either of these flags requires that the Cargo.lock file is
           up-to-date. If the lock file is missing, or it needs to be updated,
           Cargo will exit with an error. The --frozen flag also prevents
           Cargo from attempting to access the network to determine if it is
           out-of-date.

           These may be used in environments where you want to assert that the
           Cargo.lock file is up-to-date (such as a CI build) or want to avoid
           network access.

       --offline
           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.

           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 cargo-fetch(1)
           command to download dependencies before going offline.

           May also be specified with the net.offline config value
           <https://doc.rust-lang.org/cargo/reference/config.html>.

   Common Options
       +toolchain
           If Cargo has been installed with rustup, and the first argument to
           cargo begins with +, it will be interpreted as a rustup toolchain
           name (such as +stable or +nightly). See the rustup documentation
           <https://rust-lang.github.io/rustup/overrides.html> for more
           information about how toolchain overrides work.

       -h, --help
           Prints help information.

       -Z flag
           Unstable (nightly-only) flags to Cargo. Run cargo -Z help for
           details.

   Miscellaneous Options
       The --jobs 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.

       -j N, --jobs N
           Number of parallel jobs to run. May also be specified with the
           build.jobs config value
           <https://doc.rust-lang.org/cargo/reference/config.html>. Defaults
           to the number of CPUs.


PROFILES

       Profiles may be used to configure compiler options such as optimization
       levels and debug settings. See the reference
       <https://doc.rust-lang.org/cargo/reference/profiles.html> for more
       details.

       Benchmarks are always built with the bench profile. Binary and lib
       targets are built separately as benchmarks with the bench profile.
       Library targets are built with the release profiles when linked to
       binaries and benchmarks. Dependencies use the release profile.

       If you need a debug build of a benchmark, try building it with
       cargo-build(1) which will use the test profile which is by default
       unoptimized and includes debug information. You can then run the
       debug-enabled benchmark manually.


ENVIRONMENT

       See the reference
       <https://doc.rust-lang.org/cargo/reference/environment-variables.html>
       for details on environment variables that Cargo reads.


EXIT STATUS

       o  0: Cargo succeeded.

       o  101: Cargo failed to complete.


EXAMPLES

        1. Build and execute all the benchmarks of the current package:

               cargo bench

        2. Run only a specific benchmark within a specific benchmark target:

               cargo bench --bench bench_name -- modname::some_benchmark


SEE ALSO

       cargo(1), cargo-test(1)



                                                                cargo-bench(1)

cargo 0.52.0 - Generated Sat Mar 27 08:14:33 CDT 2021
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