[PATCH] Cygwin: Speed up mkimport

Achim Gratz Stromeko@nexgo.de
Fri Nov 27 18:37:59 GMT 2020

Mark Geisert writes:
> Still faster than two system commands :-).  But thanks for the
> comment;

It still seems you are barking up the wrong tree.

> I thought I was merely grouping args, to get around Perl's
> greedy arg list building for the system command.

Wot?  It just takes a list which you can build any which way you desire.
The other option is to give it the full command line in a string, which
does work for this script (but not on Windows).  If it finds shell
metacharacters in the arguments it'll run a shell, otherwise the forked
perl just does an execve.

If it's really the forking that is causing the slowdown, why not do
either of those things:

a) Generate a complete shell script and fork once to run that.

b) Open up two pipes to an "xargs -P $ncpu/2 L 1 …" and feed in the file

Getting the error codes back to the script and handling the error is
left as an exercise for the reader.

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