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X-HELO:	calimero.vinschen.de
Date:	Mon, 8 Jun 2015 15:21:03 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: More details about the tmux 2.0 regression
Message-ID:	<20150608132103.GJ3005@calimero.vinschen.de>
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On Jun  8 14:41, Corinna Vinschen wrote:
> On Jun  6 12:58, =C4=B0smail D=C3=B6nmez wrote:
> > Hi,
> >=20
> > I had a nice discussion with tmux maintainers over at
> > https://github.com/tmux/tmux/issues/13 about the tmux 2.0 regression
> > on Cygwin.
> >=20
> > Long story short, tmux is trying to read /proc/<pid>/cmdline and
> > /proc/<pid>/cwd for various reasons and for non-Cygwin programs this
> > is quite slow. You can reproduce this easily run cmd.exe inside bash
> > and try to
> >=20
> > cat /proc/<pid of cmd.exe>/cmdline
>=20
> Good catch!
>=20
> The problem here was that this functionality is very Cygwin centric.  It
> tries to call into the process itself to fetch the information.
>=20
> E.g, assuming you have some /proc/1234, it tries to fetch the information
> by sending a request to process 1234 and then waits for that process
> setting a semaphore.  A non-Cygwin process will obviously fail to do so,
> not knowing about the method at all.
>=20
> I fixed that in the Cygwin git repo and it seems to work much better now
> to run native tools inside tmux with this change.
>=20
> I'll upload a developer snapshot on https://cygwin.com/snapshots/ later
> today.

Snapshot is up.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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