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Re: Command line option to set niceness

From: Aaron Paetznick
Subject: Re: Command line option to set niceness
Date: Tue, 16 Nov 2010 02:22:37 -0600
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20101027 Thunderbird/3.1.6

I use something like "... | nice -n -100 parallel nice -n 200 cmd". This ensures parallel itself is run with a high priority and it's children are run with a low priority. I use this type of arrangement as a cron job to compress backup files on a busy server.


On 11/15/2010 10:33 AM, Rhys Ulerich wrote:
Would it be possible to add a command line option, say -n, to cause
parallel to spawn processes with a modified niceness?  Possibly
feeding -n with no option would be equivalent to prepending the
command with nice(1) and -n [#] would adjust the priority per
nice(1)'s page.

Admittedly, the user can simply use nice wherever desired.  My
interest is for having $PARALLEL or the configuration file pick this
up automagically.  That way I don't bring my UI to a grinding halt
whenever GNU parallel's doing it's thing.


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