[Dovecot] Dovecot (IMAP) Hangs sometimes

[Mario Gomide]

Yeap! It worked just fine!

No problems at all now!
Thanks for the help!
Mario


On Fri, Jan 8, 2010 at 2:58 PM, Mario Gomide <mariogomide at gmail.com> wrote:

> The specific moments are at about 9:40 am and 2:30 pm. Exactly when I have
> most of my users connecting simultaneously (when they arrive in the morning
> and back from lunch break). At these exact moments, dovecot hangs.
>
>
> Anyways, I took a look at http://wiki.dovecot.org/LoginProcess. I
> increased the default login_max_processes_count from 128 to 256 and
> restarted dovecot.
>
> Right before doing this (2:24pm, at this time, imap was getting slow
> already and dovecot was about to hang) I checked my processes every second:
> ps -ef | grep imap-login | grep dovecot | wc -l
> and the results varied from 149 to 152.
>
> After setting login_max_processes_count to 256, I hope the problem is
> fixed. I didn't do anything related to open file descriptors.
>
> Mario
>
>
>
>
> On Fri, Jan 8, 2010 at 11:36 AM, Steffen Kaiser <
> skdovecot at smail.inf.fh-brs.de> wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
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>> On Fri, 8 Jan 2010, Mario Gomide wrote:
>>
>>  Then I commented the listen line, and things got better, but not good
>>> enough
>>> yet. Strange, uh?
>>>
>>
>> I never tried that.
>>
>>
>>  Just for the record: My mail server is running super fast! The problem
>>> happens only at specific moments, twice a day, only.
>>>
>>
>> specific moments? Which and what are the spesifics?
>>
>> If I remember correctly, I made logs of the number of file descriptors of
>> the "dovecot" process; each time the number _almost_ reached the max (say
>> one or two  are not allocated yet), I saw the stalls _and_ when I manually
>> logged off users (kill -15 imap-process) the number did not decreased. Well,
>> not much anyway.
>> Sort of, it looked like a fd leak.
>>
>> Since I have ulimit -n in my init.d, no such problem came up again. The
>> previous ulimit was lower than the max Dovecot could handle.
>>
>>
>> Regards,
>>
>> - -- Steffen Kaiser
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