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How slow is GNU Parallel

From: Ole Tange
Subject: How slow is GNU Parallel
Date: Wed, 20 Aug 2014 12:37:24 +0200

Back in the early days of GNU Parallel a job could be processed within
just 3 ms.

These days there are many more checks and much more flexibility has
been added - and that costs.

So I was curious how the performance of GNU Parallel has changed over time.

This was measured on my 4 hyperthreaded cpus (= 8 "cores") forced to
run 1.7GHz, so the timings may be lower if you have a faster cpu or if
you do not use hyperthreading.

So there are a couple of increases that stand out:

* 20101122 included a complete rewrite to object orientation. Without
this rewrite a lot of the following development would have been much
* 20140722 made it possible to use Perl expressions as replacement
strings. Without this the elegant '--rpl' would not have been

All in all you should expect around 10 ms for starting a job locally
using GNU Parallel.


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