Difference between revisions of "Parallel" - Free Software Directory

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|Related projects=GNU SQL,  
|Related projects=GNU SQL,  
|Keywords=Perl,argument,parallel,parallel processing,execution,cat
|Keywords=Perl,argument,parallel,parallel processing,execution,cat
|Version identifier=Utøya
|Version identifier=20110822 (Utøya)
|Version date=2011/08/22
|Version date=2011/08/22
|Version status=stable
|Version status=stable

Revision as of 17:37, 20 September 2011


GNU Parallel

Parallel is a shell tool for executing jobs in parallel using one or more computers.

A job is can be a single command or a small script that has to be run for each of the lines in the input. The typical input is a list of files, a list of hosts, a list of users, a list of URLs, or a list of tables. A job can also be a command that reads from a pipe. GNU Parallel can then split the input and pipe it into commands in parallel. If you use xargs and tee today you will find GNU Parallel very easy to use as GNU Parallel is written to have the same options as xargs. If you write loops in shell, you will find GNU Parallel may be able to replace most of the loops and make them run faster by running several jobs in parallel. GNU Parallel can even replace nested loops.

GNU Parallel makes sure output from the commands is the same output as you would get had you run the commands sequentially. This makes it possible to use output from GNU Parallel as input for other programs.

For each line of input, GNU Parallel will execute command with the line as arguments. If no command is given, the line of input is executed. Several lines will be run in parallel. GNU Parallel can often be used as a substitute for xargs or cat Pipe.pngbash.

The GNU Parallel distribution also includes an 'sql' script which aims to give a simple, unified interface for accessing databases through all the different databases' command line clients, and a 'niceload' script to slow down or suspend a program if system activity is above a given threshold.


Documentation for GNU Parallel is available online at gnu.org/s/parallel/man . Screencasts videos can be found at http://commons.wikimedia.org/wiki/GNU_parallel.

Heckert gnu.small.png This is a GNU package:parallel


Download version 20161122 (stable)
released on 22 November 2016


Identica.png https://twitter.com/GnuParallel


VCS Checkout


Related Projects


LicenseVerified byVerified onNotes
GPLv3orlaterKelly Hopkins24 September 2010

Leaders and contributors

Ole Tange Maintainer

Resources and communication

Audience Resource type URI
Developer E-mail bug-parallel@gnu.org
Developer VCS Repository Webview http://git.savannah.gnu.org/cgit/parallel.git
Developer Download http://ftpmirror.gnu.org/parallel/
GNU Homepage https://www.gnu.org/software/guix/packages/p.html
Debian Homepage https://packages.debian.org/jessie/parallel
User E-mail parallel@gnu.org
Gentoo Homepage https://packages.gentoo.org/packages/sys-process/parallel

Software prerequisites

Kind Description
Required to use Perl 5.8

This entry (in part or in whole) was last reviewed on 22 December 2016.


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The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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