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Re: gnu parallel mechanism

From: Markus Bergholz
Subject: Re: gnu parallel mechanism
Date: Sun, 20 Jul 2014 16:19:38 +0200

On Sun, Jul 20, 2014 at 4:15 PM, Ole Tange <> wrote:
On Sun, Jul 20, 2014 at 4:02 PM, Markus Bergholz <> wrote:
> Hi,
> I'd like to know what's behind gnu parallel? how does the parallelization
> works? It doesn't use openmp, does it?

Perl's open3 and fork.

Well, maybe that's interesting for you too

    time gm mogrify -resize 50% *.JPG
    real 3m57.774s

    time ls | parallel --no-notice -j "2" gm mogrify -resize 50% 
    real 3m45.902s

graphicsmagick is using openmp, but giving gm just 2x1 image with gnu parallel seems to be faster.


icq: 167498924

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