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# ruby/benchmark
This directory has benchmark definitions to be run with
[benchmark\_driver.gem](https://github.com/benchmark-driver/benchmark-driver).
## Normal usage
Execute `gem install benchmark_driver` and run a command like:
```bash
# Run a benchmark script with the ruby in the $PATH
benchmark-driver benchmark/app_fib.rb
# Run benchmark scripts with multiple Ruby executables or options
benchmark-driver benchmark/*.rb -e /path/to/ruby -e '/path/to/ruby --jit'
# Or compare Ruby versions managed by rbenv
benchmark-driver benchmark/*.rb --rbenv '2.5.1;2.6.0-preview2 --jit'
# You can collect many metrics in many ways
benchmark-driver benchmark/*.rb --runner memory --output markdown
# Some are defined with YAML for complex setup or accurate measurement
benchmark-driver benchmark/*.yml
```
See also:
```console
Usage: benchmark-driver [options] RUBY|YAML...
-r, --runner TYPE Specify runner type: ips, time, memory, once, block (default: ips)
-o, --output TYPE Specify output type: compare, simple, markdown, record, all (default: compare)
-e, --executables EXECS Ruby executables (e1::path1 arg1; e2::path2 arg2;...)
--rbenv VERSIONS Ruby executables in rbenv (x.x.x arg1;y.y.y arg2;...)
--repeat-count NUM Try benchmark NUM times and use the fastest result or the worst memory usage
--repeat-result TYPE Yield "best", "average" or "worst" result with --repeat-count (default: best)
--alternate Alternate executables instead of running the same executable in a row with --repeat-count
--bundler Install and use gems specified in Gemfile
--filter REGEXP Filter out benchmarks with given regexp
--run-duration SECONDS Warmup estimates loop_count to run for this duration (default: 3)
--timeout SECONDS Timeout ruby command execution with timeout(1)
-v, --verbose Verbose mode. Multiple -v options increase visilibity (max: 2)
```
## make benchmark
Using `make benchmark`, `make update-benchmark-driver` automatically downloads
the supported version of benchmark\_driver, and it runs benchmarks with the downloaded
benchmark\_driver.
```bash
# Run all benchmarks with the ruby in the $PATH and the built ruby
make benchmark
# Or compare with specific ruby binary
make benchmark COMPARE_RUBY="/path/to/ruby --jit"
# Run vm benchmarks
make benchmark ITEM=vm
# Run some limited benchmarks in ITEM-matched files
make benchmark ITEM=vm OPTS=--filter=block
# You can specify the benchmark by an exact filename instead of using the default argument:
# ARGS = $$(find $(srcdir)/benchmark -maxdepth 1 -name '*$(ITEM)*.yml' -o -name '*$(ITEM)*.rb')
make benchmark ARGS=benchmark/erb_render.yml
# You can specify any option via $OPTS
make benchmark OPTS="--help"
# With `make benchmark`, some special runner plugins are available:
# -r peak, -r size, -r total, -r utime, -r stime, -r cutime, -r cstime
make benchmark ITEM=vm_bigarray OPTS="-r peak"
```
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