[Dovecot] OpenBSD and too many open files

[Quentin Garnier]

On Wed, Aug 01, 2007 at 07:52:33PM +0300, Timo Sirainen wrote:
> On 1.8.2007, at 19.43, Quentin Garnier wrote:
> 
> >FWIW, I've stopped using dovecot's kqueue code quite some time ago
> >because it would leak one fd almost every login, leading to the  
> >kind of
> >situation you experience.  I wish I had the time to debug that, but
> >unfortunately...
> 
> I thought this happened only with older NetBSDs. I tested it myself  
> once with 3.0 (or 3.1?) and I couldn't get it to leak.

Yes, older NetBSDs.  What do you think OpenBSD is?

Nah, just kidding.  I don't remember what tests I did at the time.  I
do remember that I couldn't reproduce it as easily as I wanted to, and
the likely cause was that I was doing my tests on a kernel more recent
than the 2.0 of my prod servers.

> But yes, with some NetBSD versions it does leak one pipe per each  
> died process because kqueue doesn't notice that the pipe was closed  
> by the other side and give an event, or something like that.

Which does look like what is experienced here.  Now, I don't know if we
can locate easily what fix needs to be applied to OpenBSD.

-- 
Quentin Garnier - cube at cubidou.net - cube at NetBSD.org
"You could have made it, spitting out benchmarks
Owe it to yourself not to fail"
Amplifico, Spitting Out Benchmarks, Hometakes Vol. 2, 2005.
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