Difference between revisions of "Parallel"
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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. | 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. | ||
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Revision as of 17:28, 6 December 2011
GNU Parallel
http://www.gnu.org/software/parallel/
GNU 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
bash.
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
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.
Related Projects
This is a GNU package:parallel
Download
Download 
version 20111222
(stable)
released on 22 December 2011
Categories
Licensing
| License | Verified by | Verified on | Notes |
|---|---|---|---|
| GPLv3orlater | Kelly Hopkins | 24 September 2010 |
Leaders and contributors
| Contact(s) | Role |
|---|---|
 Ole Tange | Maintainer |
Resources and communication
| Audience | Resource type | URI |
|---|---|---|
| General | Download | http://ftp.gnu.org/gnu/parallel/ |
Software prerequisites
This entry (in part or in whole) was last reviewed on 5 January 2012.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.
The copyright and license notices on this page only apply to the text on this page. Any software described in this text has its own copyright notice and license, which can usually be found in the distribution itself.