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GNU Parallel 20100620 released

Item posted by Ole Tange <tange> on Tue 22 Jun 2010 06:33:16 PM UTC.

GNU Parallel 20100620 has been released. It is available for download at: http://ftp.gnu.org/gnu/parallel/

New in this release:

  • 100% options complete with xargs. All options for xargs can now be used in GNU Parallel - even the more exotic.
  • --basefile for transferring basedata. When running jobs on remote computers --basefile will transfer files before the first jobs is run. It can be used to transfer data that remains the same for each job such as scripts or lookup tables.
  • --progress shows progress. To see how many jobs is running on each server use --progress. It can be turned on even after GNU Parallel is started.
  • --eta shows estimated time left in seconds.
  • --halt-on-error stops if an error occurs. GNU Parallel will default to run all jobs - even if some of them fail. With --halt-on-error GNU Parallel can ignore errors, wait for the currently running jobs to finish, or stop immediately when an error occurs.

About GNU Parallel

GNU Parallel is a shell tool for executing jobs in parallel using one or more machines. 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. If you use ppss or pexec you will find GNU Parallel will often make the command easier to read.

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.

You can find more about GNU Parallel at: http://www.gnu.org/software/parallel/

Watch the intro video on http://www.youtube.com/watch?v=OpaiGYxkSuQ

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