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99 lines
3 KiB
Plaintext
99 lines
3 KiB
Plaintext
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GNU Parallel README
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Please send problems and feedback to bug-parallel@gnu.org.
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= Presentation of GNU Parallel =
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GNU Parallel is a shell tool for executing jobs in parallel using one
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or more computers. A job can be a single command or a small script
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that has to be run for each of the lines in the input. The typical
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input is a list of files, a list of hosts, a list of users, a list of
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URLs, or a list of tables. A job can also be a command that reads from
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a pipe. GNU Parallel can then split the input and pipe it into
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commands in parallel.
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If you use xargs and tee today you will find GNU Parallel very easy to
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use as GNU Parallel is written to have the same options as xargs. If
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you write loops in shell, you will find GNU Parallel may be able to
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replace most of the loops and make them run faster by running several
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jobs in parallel.
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GNU Parallel makes sure output from the commands is the same output as
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you would get had you run the commands sequentially. This makes it
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possible to use output from GNU Parallel as input for other programs.
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= 10 seconds installation =
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The 10 seconds installation will try do to a full installation; if
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that fails, a personal installation; if that fails, a minimal
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installation.
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(wget -O - pi.dk/3 || curl pi.dk/3/ || fetch -o - http://pi.dk/3) | bash
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This will literally install faster than reading the rest of this
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document.
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= Full installation =
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Full installation of GNU Parallel is as simple as:
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wget http://ftpmirror.gnu.org/parallel/parallel-20160722.tar.bz2
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bzip2 -dc parallel-20160722.tar.bz2 | tar xvf -
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cd parallel-20160722
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./configure && make && sudo make install
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= Personal installation =
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If you are not root you can add ~/bin to your path and install in
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~/bin and ~/share:
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wget http://ftpmirror.gnu.org/parallel/parallel-20160722.tar.bz2
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bzip2 -dc parallel-20160722.tar.bz2 | tar xvf -
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cd parallel-20160722
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./configure --prefix=$HOME && make && make install
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Or if your system lacks 'make' you can simply copy src/parallel
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src/sem src/niceload src/sql to a dir in your path.
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= Minimal installation =
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If you just need parallel and do not have 'make' installed (maybe the
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system is old or Microsoft Windows):
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wget http://git.savannah.gnu.org/cgit/parallel.git/plain/src/parallel
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chmod 755 parallel
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cp parallel sem
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mv parallel sem dir-in-your-$PATH/bin/
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= Test the installation =
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After this you should be able to do:
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parallel -j0 ping -nc 3 ::: qubes-os.org gnu.org freenetproject.org
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This will send 3 ping packets to 3 different hosts in parallel and print
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the output when they complete.
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Watch the intro video for a quick introduction:
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https://www.youtube.com/playlist?list=PL284C9FF2488BC6D1
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Walk through the tutorial (man parallel_tutorial). You command line
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will love you for it.
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When using programs that use GNU Parallel to process data for
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publication please cite:
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O. Tange (2011): GNU Parallel - The Command-Line Power Tool,
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;login: The USENIX Magazine, February 2011:42-47.
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= New versions =
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New versions will be released at: ftp://ftp.gnu.org/gnu/parallel/
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