On Sun, Jul 20, 2014 at 4:15 PM, Ole Tange <ta...@gnu.org> wrote:
> On Sun, Jul 20, 2014 at 4:02 PM, Markus Bergholz <marku...@gmail.com>
> 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.
> /Ole
>
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