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Re: Benchmark of: -j0
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From: |
Ole Tange |
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Subject: |
Re: Benchmark of: -j0 |
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Date: |
Mon, 13 Feb 2017 10:56:54 +0100 |
On Sun, Feb 12, 2017 at 5:48 PM, Hans Schou <hans.schou@gmail.com> wrote:
> Should one use -j default or -j0 ?
It depends.
If the goal is to replace code where you want to run as many jobs in
parallel as possible, then -j0 is a good choice. So if you want to
replace the code below and still want them all to run in parallel, -j0
would be the best choice:
echo "x" &
echo "y" &
echo "z" &
.....
echo "Z" &
wait
However, if you optimize for speed then it becomes more complex.
http://stackoverflow.com/a/37972317/363028
http://stackoverflow.com/a/40757613/363028
https://oletange.wordpress.com/2015/07/04/parallel-disk-io-is-it-faster/
(TL;DR: The conclusion is to measure - do not assume).
/Ole