Re: #518696 ITP: parallel -- build and execute command lines from standard input in parallel]
Samuel Thibault <email@example.com> writes:
> Andreas Rottmann, le Mon 09 Mar 2009 11:25:11 +0100, a écrit :
>> Did you know about the `-P' option of GNU xargs?
> Herm, I would have found it if the manpage didn't lack keywords like
> "parallel", "simultaneous", ... Reassigning.
> That being said, I guess xargs lacks one parallel feature:
> -g Group output. Output from each jobs is grouped together and is only printed
> when the command is finished. STDERR first followed by STDOUT. -g is the
> default. Can be reversed with -u.
> A lot of applications (including md5sum) would not necessarily print
> their output atomically and then you get mixed output. Either we add
> the option to findutils, or we package parallel.
Indeed, that's a very valuable feature (if not essential) when the
commands produce output; I've attached a script that can be used to
verify that "xargs -P" does not do this, can be used like:
xargs -P 5 ./test.sh < /some/text/file
for i in `seq 10`; do
echo -n "$i "