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From: =?UTF-8?B?xLBzbWFpbCBEw7ZubWV6?= <ismail AT donmez DOT ws>
Date: Mon, 8 Jun 2015 18:12:56 +0300
Message-ID: <CAJ1KOAiz8rV33jmCuLHj9pkLBD+3w3N+7+eEQ6cZwScAkcsNyg@mail.gmail.com>
Subject: Re: More details about the tmux 2.0 regression
To: cygwin AT cygwin DOT com
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On Mon, Jun 8, 2015 at 4:21 PM, Corinna Vinschen
<corinna-cygwin AT cygwin DOT com> wrote:
> On Jun  8 14:41, Corinna Vinschen wrote:
>> On Jun  6 12:58, İsmail Dönmez wrote:
>> > Hi,
>> >
>> > 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.
>> >
>> > 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
>> >
>> > cat /proc/<pid of cmd.exe>/cmdline
>>
>> Good catch!
>>
>> The problem here was that this functionality is very Cygwin centric.  It
>> tries to call into the process itself to fetch the information.
>>
>> 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.
>>
>> 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.
>>
>> I'll upload a developer snapshot on https://cygwin.com/snapshots/ later
>> today.
>
> Snapshot is up.

That resolves the problem for me, cheers!

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