Installing the command-line executable

Assuming you have Rust/Cargo installed, run this command in a terminal:

cargo install rust-parallel

It will make the rust-parallel command available in your PATH if you've allowed the PATH to be modified when installing Rust. cargo uninstall rust-parallel uninstalls.

Back to the crate overview.

Readme

rust-parallel

Run commands in parallel and aggregate outputs. Async application using tokio.

Example commands and detailed manual.

Listed in Awesome Rust - utilities

Similar interface to GNU Parallel or xargs plus useful features:

More than 10x faster than GNU Parallel in benchmarks
Run commands from stdin, input files, or ::: arguments
Pipe mode to read blocks from stdin and pass to parallel commands automatically.
Automatic parallelism to all cpus, or configure manually
Transform inputs with variables or regular expressions
Prevent output interleaving and maintain input order with -k/--keep-order
Shell mode to run bash functions and commands
TUI progress bar using indicatif
Path cache
Command timeouts
Structured debug logging
Dry run mode
Configurable error handling

Installation

Homebrew

With Homebrew installed, run

brew install rust-parallel

Pre-built release

Download a pre-built release from Github Releases for Linux, MacOS, or Windows.
Extract the executable and put it somewhere in your $PATH.

From Crates.io via Cargo

Install Rust
Install the latest version of this app from crates.io:
```
$ cargo install rust-parallel   
```

The same cargo install rust-parallel command will also update to the latest version after initial installation.

Documents:

Examples - complete runnable commands to give an idea of overall features.
Manual - more detailed manual on how to use individual features.
Benchmarks
Output Interleaving - output interleaving in rust-parallel compared with other commands.

Tech Stack:

anyhow used for application error handling to propogate and format fatal errors.
clap command line argument parser.
itertools using multi_cartesian_product to process ::: command line inputs.
indicatif optional TUI progress bar.
regex optional regular expression capture groups processing for -r/--regex option.
tokio asynchronous runtime for rust. From tokio this app uses:
- async / await functions (aka coroutines)
- Singleton CommandLineArgs instance using tokio::sync::OnceCell.
- Asynchronous command execution using tokio::process::Command
- tokio::sync::Semaphore used to limit number of commands that run concurrently.
- tokio::sync::mpsc::channel used to receive inputs from input task, and to send command outputs to an output writer task. To await command completions, use the elegant property that when all Senders are dropped the channel is closed.
tracing structured debug and warning logs.
- tracing::Instrument is used to provide structured debug logs.
which used to resolve command paths for path cache.