GNU parallel is a shell tool for executing jobs in parallel locally or using remote computers. A job is typically 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. If you use xargs 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 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.
|Tags||Text Processing parallel Parallel processing Multicore Clustering/Distributed Networks Command Line Tools Filters System Administration|
|Operating Systems||POSIX Linux Darwin FreeBSD OpenBSD Open Solaris OpenIndiana AIX|
Release Notes: A citation notice is printed on stderr only if stderr is a terminal, the user has not specified --no-notice, and the user has not run --bibtex once. --compress will compress temporary files. --compress-program controls which program to use for compressing temporary files. --bar shows progress as a progress bar compatible with zenity. --resume can now be used with --result: jobs already run will be skipped. --transfer and --basefile support paths relative to the --workdir by inserting /./ into the path.
Release Notes: Using --transfer with files containing /./ in the path will copy the files relative to the --workdir. The maximal command length is now cached in a file, halving the startup time.
Release Notes: PDF-files of documentation is now included. Bugfixes and man page updates have been made. This is considered a stable release.
Release Notes: This release adds a tutorial showing much of GNU Parallel's functionality. man parallel_tutorial --line-buffer will buffer output on a line basis. --record-env records all variables and functions set (useful to record the normal environment before using --env _). --env _ exports all functions and variables to the remote server except for the ones recorded.
Release Notes: --round-robin with --pipe will now write all blocks to already-running jobs. --env can now transfer the Bash function for remote execution.