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bug#51110: Native-comp leaks fds open on /dev/ptmx
From: |
Eli Zaretskii |
Subject: |
bug#51110: Native-comp leaks fds open on /dev/ptmx |
Date: |
Tue, 30 Nov 2021 22:18:51 +0200 |
> From: Andrea Corallo <akrl@sdf.org>
> Cc: Stephen Gildea <stepheng+emacs@gildea.com>, 51110@debbugs.gnu.org
> Date: Tue, 30 Nov 2021 20:13:07 +0000
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> >> From: Stephen Gildea <stepheng+emacs@gildea.com>
> >> cc: Andrea Corallo <akrl@sdf.org>, 51110@debbugs.gnu.org
> >> Date: Sat, 09 Oct 2021 10:01:43 -0700
> >>
> >> Apparently what's happening is that Emacs forks off a child Emacs to do
> >> the compile and allocates a pty to the child. These ptys are not
> >> closed until the compile completes. It seems Emacs needs to better
> >> manage the number of simultaneous open ptys. Or at least be able to
> >> wait and retry if an open fails.
> >
> > Emacs limits the number of these background processes, see
> > native-comp-async-jobs-number. (The value zero means use half of the
> > number of execution units available in the system's processor.) So we
> > generally shouldn't have more than that number of open pipes at any
> > given time. For the obvious reasons they cannot be closed until the
> > sub-process exits.
>
> Is there any action we need/can take on this bug?
I don't think there's anything we _can_ do here, and I tried to
explain why.