This project provides the bench command-line tool, which is a more powerful
alternative to the time command. Use bench to benchmark a command using
Haskell's criterion library.
Key features:
- Repeated runs
- Detailed statistical output
- Gorgeous HTML output (via the
--outputflag) (Example) - Also supports CSV or templated output
You can install bench on macOS via Homebrew:
$ brew install bench... or you can install bench using Haskell's stack tool. To do that, first
download the Haskell toolchain,
which provides the stack tool, then run:
$ stack setup
$ stack install benchstack install will install bench to ~/.local/bin or something similar.
Make sure that the installation directory is on your executable search path
before running bench. stack will remind you to do this if you forget.
Another alternative is to use Nix package manager. After its installation just execute:
$ nix-env -i bench
Once you've installed bench (either by download or installation via stack or Nix),
you can begin benchmarking programs:
$ bench 'sleep 1' # Don't forget to quote the command line
benchmarking sleep 1
time 1.003 s (1.002 s .. 1.003 s)
1.000 R² (1.000 R² .. 1.000 R²)
mean 1.003 s (1.003 s .. 1.003 s)
std dev 92.92 μs (0.0 s .. 101.8 μs)
variance introduced by outliers: 19% (moderately inflated)
$ bench true
benchmarking true
time 410.3 μs (382.3 μs .. 443.3 μs)
0.974 R² (0.961 R² .. 0.987 R²)
mean 420.7 μs (406.8 μs .. 435.7 μs)
std dev 47.69 μs (40.09 μs .. 57.91 μs)
variance introduced by outliers: 81% (severely inflated)All output from the command being benchmarked is discarded.
Multiple commands are also supported:
$ bench id ls "sleep 0.1"
benchmarking bench/id
time 4.798 ms (4.764 ms .. 4.833 ms)
0.999 R² (0.998 R² .. 1.000 R²)
mean 4.909 ms (4.879 ms .. 4.953 ms)
std dev 104.6 μs (78.91 μs .. 135.7 μs)
benchmarking bench/ls
time 2.941 ms (2.889 ms .. 3.006 ms)
0.996 R² (0.992 R² .. 0.998 R²)
mean 3.051 ms (3.015 ms .. 3.094 ms)
std dev 129.7 μs (104.3 μs .. 178.3 μs)
variance introduced by outliers: 25% (moderately inflated)
benchmarking bench/sleep 0.1
time 109.9 ms (108.5 ms .. 111.0 ms)
1.000 R² (1.000 R² .. 1.000 R²)
mean 109.2 ms (108.5 ms .. 109.7 ms)
std dev 903.0 μs (676.4 μs .. 1.212 ms)You can also output an HTML file graphing the distribution of
timings by using the --output flag:
$ bench 'ls /usr/bin | wc -l' --output example.html
benchmarking ls /usr/bin | wc -l
time 6.716 ms (6.645 ms .. 6.807 ms)
0.999 R² (0.999 R² .. 0.999 R²)
mean 7.005 ms (6.897 ms .. 7.251 ms)
std dev 462.0 μs (199.3 μs .. 809.2 μs)
variance introduced by outliers: 37% (moderately inflated)... and if you open that page in your browser you will get something that looks like this:
$ bench --help
Command-line tool to benchmark other programs
Usage: bench COMMAND ([-I|--ci CI] [-G|--no-gc] [-L|--time-limit SECS]
[--resamples COUNT] [--regress RESP:PRED..] [--raw FILE]
[-o|--output FILE] [--csv FILE] [--junit FILE]
[-v|--verbosity LEVEL] [-t|--template FILE] [-m|--match MATCH]
[NAME...] | [-n|--iters ITERS] [-m|--match MATCH] [NAME...] |
[-l|--list] | [--version])
Available options:
-h,--help Show this help text
COMMAND The command line to benchmark
-I,--ci CI Confidence interval
-G,--no-gc Do not collect garbage between iterations
-L,--time-limit SECS Time limit to run a benchmark
--resamples COUNT Number of bootstrap resamples to perform
--regress RESP:PRED.. Regressions to perform
--raw FILE File to write raw data to
-o,--output FILE File to write report to
--csv FILE File to write CSV summary to
--junit FILE File to write JUnit summary to
-v,--verbosity LEVEL Verbosity level
-t,--template FILE Template to use for report
-m,--match MATCH How to match benchmark names ("prefix" or "glob")
-n,--iters ITERS Run benchmarks, don't analyse
-m,--match MATCH How to match benchmark names ("prefix" or "glob")
-l,--list List benchmarks
--version Show version info
This is a pretty simple utility which just wraps criterion in a command-line
tool, so I don't expect this project to change much. However, only time will
tell.
Copyright Gabriella Gonzalez (c) 2016
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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