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List:       info-cyrus
Subject:    Re: long delay in getting lock on 2.4.16
From:       Deniss <cyrus () sad ! lv>
Date:       2012-11-14 13:22:15
Message-ID: 50A39B07.7050108 () sad ! lv
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well, i see reconstruct is running in that time which has exclusive lock 
as well i assume.

thanx Brong for pointing.


On 14.11.2012 14:51, Bron Gondwana wrote:
> On Wed, Nov 14, 2012, at 12:53 PM, Deniss wrote:
>> hello !
>>
>> I have an issue with cyrus-imapd-2.4.16 and locks.
>> cmdtimer reports long time execution like this:
>>
>> Nov 14 08:47:15 brat5 imap[16897]: cmdtimer: 'ega9024' 'status' '<none>'
>> '24.577343' '0.000000'
>> Nov 14 10:18:02 brat5 imap[26631]: cmdtimer: 'evijanagle' 'select'
>> 'user.evijanagle.Photos' '24.136381' '0.000000'
>> Nov 14 10:18:02 brat5 imap[26622]: cmdtimer: 'evijanagle' 'select'
>> 'user.evijanagle.Photos' '31.103348' '0.000000'
>> Nov 14 10:58:32 brat5 imap[30646]: cmdtimer: 'egil^k' 'status' '<none>'
>> '22.480196' '0.000000'
>> Nov 14 10:58:32 brat5 imap[30708]: cmdtimer: 'egil^k' 'status' '<none>'
>> '10.285937' '0.000000'
>>
>> i traced down to func mailbox_lock_index() where following code produces
>> delays:
>>
>>       if (locktype == LOCK_EXCLUSIVE)
>>           r = lock_blocking(mailbox->index_fd);
>>       else
>>           r = lock_shared(mailbox->index_fd);
>>
>> lock files are stored in tmpfs
>>
>>
>> what is the problem may be here ?
>
> Smells like cyr_expire is running.  Do you get cyr_expire log entries around
> the same time?  It needs an exclusive lock while it repacks the index, so you
> should notice that the mailbox was being repacked, and these other programs
> had to wait until the lock was freed before they could open the mailbox.
>
> This would be caused by having quite high IO wait times (or very large folders)
> for those users.
>
> Bron.
>
----
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