A small CLI tool for reproducing heisenbugs
Project description
Heisenrun
Heisenrun is a small CLI tool for reproducing heisenbugs by running many instances of a command in parallel.
Heisenbugs are bugs that appear only under certain timing or concurrency conditions and disappear when you try to debug them. Heisenrun increases the chance of triggering such bugs by repeatedly executing a command concurrently.
Typical use cases:
- Reproducing flaky tests
- Triggering race conditions
- Stress-testing CLI programs
- Detecting nondeterministic behavior
Getting Started
Run instantly (recommended)
Using uv:
uv tool run heisenrun --help
Example:
uv tool run heisenrun -n 10 -m 2 -- sleep {#}
This downloads and installs heisenrun into an isolated environment. If you wish more control please consider the next command.
Install tool via UV (also recommended)
You can also
Install with pipx
pipx also installs CLI tools in isolated environments:
pipx install heisenrun
Then run:
heisenrun --help
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