Using GNU parallel to parallelize script with various arguments

Question

I am interested in running a script in parallel and I've started looking over GNU parallel tool, however I'm having a bit of trouble. My script doSomething takes 3 arguments and I would like to run the script in parallel on different values for the arguments. How can I do this?

I've tried: parallel ./doSomething {1} {2} {3} ::: {0..5} ::: {0..5} ::: {0..5} but it just seems to hang.

Any help would be greatly appreciated, thanks!

Are you using any version of GNU parallel packaged with Debian or with Ubuntu? If yes, try to use the --gnu option (or, conversely, try to use the --tollef option). — rbrito
– rbrito, Commented Mar 10, 2013 at 0:24

Ole Tange · Accepted Answer · 2013-07-02 10:50:54Z

1

Please try:

parallel --gnu echo ./doSomething {1} {2} {3} ::: {0..5} ::: {0..5} ::: {0..5}

If that works as expected, then your command is blocking because ./doSomething behaves differently when called from GNU Parallel than when it is called directly. One of the reasons why that may happen is if ./doSomething depends on having an tty connected.

edited Jul 2, 2013 at 10:50

answered Mar 10, 2013 at 20:04

Ole Tange

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