Re: Feature Request: Special input value to create a barrier

[Achim Gratz]

Achim Gratz writes:
> I could use a (configurable) special input value that creates a barrier
> (i.e. wait for all previous jobs to finish) upon parallel encountering
> it.  Usage would be something like:
>
> parallel --barrier + do_something '{}' ::: job1 job2 job3 + job4 job5 + job6 
> job7
>
> which should start the first three jobs, wait for them to finish, then
> starts the fourth and fifth job, waits again for these to finish, then
> the remaining sixth and seventh job are started in parallel.

FYI, I've been using this somewhat unwieldy invocation for now:

set $pd=( job1 job2 job3 + job4 job5 + job6 job7 )
echo $pd | sed 's/ + /\n/g' | xargs -I, dash -c "parallel do_something '{}' ::: 
,"

It does what I want and I can leave the remainder of the pipeline
untouched (which was running the jobs sequentially before, with no
barrier markers present).


Regards,
Achim.
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