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A command-line benchmarking tool

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A command-line benchmarking tool.

Demo: Benchmarking




  • Statistical analysis across multiple runs.
  • Support for arbitrary shell commands.
  • Constant feedback about the benchmark progress and current estimates.
  • Warmup runs can be executed before the actual benchmark.
  • Cache-clearing commands can be set up before each timing run.
  • Statistical outlier detection to detect interference from other programs and caching effects.
  • Export results to various formats: CSV, JSON, Markdown, AsciiDoc.
  • Parameterized benchmarks (e.g. vary the number of threads).
  • Cross-platform


Basic benchmark

To run a benchmark, you can simply call

hyperfine ...
. The argument(s) can be any shell command. For example:
hyperfine 'sleep 0.3'

Hyperfine will automatically determine the number of runs to perform for each command. By default, it will perform at least 10 benchmarking runs. To change this, you can use the

hyperfine --min-runs 5 'sleep 0.2' 'sleep 3.2'

Warmup runs and preparation commands

If the program execution time is limited by disk I/O, the benchmarking results can be heavily influenced by disk caches and whether they are cold or warm.

If you want to run the benchmark on a warm cache, you can use the

option to perform a certain number of program executions before the actual benchmark:
hyperfine --warmup 3 'grep -R TODO *'

Conversely, if you want to run the benchmark for a cold cache, you can use the

option to run a special command before each timing run. For example, to clear harddisk caches on Linux, you can run
sync; echo 3 | sudo tee /proc/sys/vm/drop_caches
To use this specific command with Hyperfine, call
sudo -v
to temporarily gain sudo permissions and then call:
hyperfine --prepare 'sync; echo 3 | sudo tee /proc/sys/vm/drop_caches' 'grep -R TODO *'

Parameterized benchmarks

If you want to run a benchmark where only a single parameter is varied (say, the number of threads), you can use the

option and call:
hyperfine --prepare 'make clean' --parameter-scan num_threads 1 12 'make -j {num_threads}'
This also works with decimal numbers. The
option can be used to control the step size:
hyperfine --parameter-scan delay 0.3 0.7 -D 0.2 'sleep {delay}'
This runs
sleep 0.3
sleep 0.5
sleep 0.7

Shell functions and aliases

If you are using bash, you can export shell functions to directly benchmark them with hyperfine:

$ my_function() { sleep 1; }
$ export -f my_function
$ hyperfine my_function

If you are using a different shell, or if you want to benchmark shell aliases, you may try to put them in a separate file:

echo 'my_function() { sleep 1 }' > /tmp/
echo 'alias my_alias="sleep 1"' > /tmp/
hyperfine 'source /tmp/; eval my_function'
hyperfine 'source /tmp/; eval my_alias'

Export results

Hyperfine has multiple options for exporting benchmark results: CSV, JSON, Markdown (see

text for details). To export results to Markdown, for example, you can use the
option that will create tables like this:

| Command | Mean [s] | Min [s] | Max [s] | Relative | |:---|---:|---:|---:|---:| |

find . -iregex '.*[0-9]\.jpg$'
| 2.275 ± 0.046 | 2.243 | 2.397 | 9.79 ± 0.22 | |
find . -iname '*[0-9].jpg'
| 1.427 ± 0.026 | 1.405 | 1.468 | 6.14 ± 0.13 | |
fd -HI '.*[0-9]\.jpg$'
| 0.232 ± 0.002 | 0.230 | 0.236 | 1.00 |

The JSON output is useful if you want to analyze the benchmark results in more detail. See the

folder for some examples.


Packaging status

On Ubuntu

Download the appropriate

package from the Release page and install it via
sudo dpkg -i hyperfine_1.11.0_amd64.deb

On Fedora

On Fedora, hyperfine can be installed from the official repositories:

dnf install hyperfine

On Alpine Linux

On Alpine Linux, hyperfine can be installed from the official repositories:

apk add hyperfine

On Arch Linux

On Arch Linux, hyperfine can be installed from the official repositories:

pacman -S hyperfine

On NixOS

On NixOS, hyperfine can be installed from the official repositories:

nix-env -i hyperfine

On Void Linux

Hyperfine can be installed via xbps

xbps-install -S hyperfine

On macOS

Hyperfine can be installed via Homebrew:

brew install hyperfine

Or you can install using MacPorts:

sudo port selfupdate
sudo port install hyperfine

On FreeBSD

Hyperfine can be installed via pkg:

pkg install hyperfine

On OpenBSD

doas pkg_add hyperfine

With conda

Hyperfine can be installed via

from the

conda install -c conda-forge hyperfine

With cargo (Linux, macOS, Windows)

Hyperfine can be installed via cargo:

cargo install hyperfine

Make sure that you use Rust 1.43 or higher.

From binaries (Linux, macOS, Windows)

Download the corresponding archive from the Release page.

Alternative tools

Hyperfine is inspired by bench.

Integration with other tools

Chronologer is a tool that uses

to visualize changes in benchmark timings across your Git history.

Make sure to check out the

folder in this repository for a set of tools to work with

benchmark results.

Origin of the name

The name hyperfine was chosen in reference to the hyperfine levels of caesium 133 which play a crucial role in the definition of our base unit of time — the second.


Copyright (c) 2018-2020 The hyperfine developers

is distributed under the terms of both the MIT License and the Apache License 2.0.

See the LICENSE-APACHE and LICENSE-MIT files for license details.

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