From: Bart Schaefer <schaefer@brasslantern.com>
To: Dima Kogan <dima@secretsauce.net>, zsh-workers@zsh.org
Subject: Re: zargs parallelization support blows up with |&
Date: Mon, 27 Jul 2015 09:15:12 -0700 [thread overview]
Message-ID: <150727091512.ZM6365@torch.brasslantern.com> (raw)
In-Reply-To: <87lhe23psr.fsf@secretsauce.net>
On Jul 27, 2:36am, Dima Kogan wrote:
}
} [... when piping] stdout and
} stderr for some output, then ALL the processes are invoked at the same
} time, not just 2 at a time like I asked:
}
} zargs -P2 -i -l1 `seq 10` -- perl -e 'sleep 20' {} |& grep x
}
} I don't know if this is a bug or an expected consequence of some
} internal implementation details, but this is a really nasty failure
} mode.
The problem is that when you append a pipe to the end, zargs ends up
as a subshell, and you can't do job control in a subshell (which you
would have seen if you weren't grepping stderr):
(eval):wait:1: can't manipulate jobs in subshell
The workaround for now is as follows:
Copy the zargs script file to somewhere in your $path, e.g. ~/bin/.
Edit the copy to add a #!/bin/zsh (or your local path) at the top,
and "chmod +x" the file.
Then either always run zargs as a script instead of an autoload, or
when you need to pipeline it, use "command zargs". This is a little
less convenient because it loses access to interactively-defined
functions, but if you're zargs-ing another external command such as
perl it should work fine.
next prev parent reply other threads:[~2015-07-27 16:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-27 9:36 Dima Kogan
2015-07-27 16:15 ` Bart Schaefer [this message]
2015-07-27 16:37 ` Bart Schaefer
2015-07-27 18:19 ` Dima Kogan
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