Message-ID: <8252341D7A1D44F3BF89D37082D9F72C@multiplay.co.uk>
From: "Steven Hartland" <killing@multiplay.co.uk>
To: <cygwin@cygwin.com>
References: <83iqhlbgoc.fsf@gmail.com> <4A6727A8.2090905@cornell.edu> <83iqhkur2h.fsf@gmail.com> <834osy98jo.fsf_-_@gmail.com> <83tz0xtt6c.fsf@gmail.com> <20090729023256.GC11458@ednor.casa.cgf.cx> <838wi8vt9v.fsf@gmail.com> <20090729232522.GC13645@ednor.casa.cgf.cx> <20090730164520.GA17582@calimero.vinschen.de>
Subject: Re: Emacs can't start-process more than 30~40 processes
Date: Thu, 30 Jul 2009 17:50:59 +0100
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----- Original Message ----- 
From: "Corinna Vinschen"

> On Jul 29 19:25, Christopher Faylor wrote:
>> On Wed, Jul 29, 2009 at 03:32:28PM +0800, Haojun Bao wrote:
>> >Christopher Faylor <cgf-use-the-mailinglist-please@cygwin.com> writes:
>> >
>> >> On Tue, Jul 28, 2009 at 10:52:44AM +0800, Haojun Bao wrote:
>> >>>I have debugged it again, and I think I have more clue. I have read the
>> >>>how-cygheap-works.txt, and this might be a known problem.
>> >>>[...]
>> >> it is a "small" number then something is wrong and we're allocating too
>> >> much of the cygheap.  The cygheap was always supposed to be relatively
>> >> small.  Maybe we're abusing it too much in 1.7.
>> >
>> >There are quite some fds. In start-process, emacs will allocate 1 PTY
>> >and 1 pipe for each process it starts.
>> 
>> Yes, I assumed that there were a bunch of fds but I was looking for an
>> exact number rather than "quite some".  I can't give exact details about
>> how to find the number now but I thought that since you were looking at
>> the code it wouldn't be too hard to figure this value out.
>> 
>> Anyway, Corinna has a stopgap fix for this which will probably show up
>> in a 1.7.0-* release sometime soon.
> 
> The stopgap fix is in 1.7.0-53.

Ahh this might also be the cause of the issue we where seeing when
I started the thread:-
maximum number of cygwin processes per user?

    Regards
    Steve


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