[Dovecot] performance problems with rc10 and solaris 10

[Jeff A. Earickson]

Dominik,

I was out on Friday.  I am out of ideas here.  I searched on Sunsolve
for some of your messages below and nothing appeared that gave any
information.  I also googled for these messages and found nothing
useful.  You might want to open a service call to Sun and have them
research it.

Jeff Earickson
Colby College

On Fri, 20 Oct 2006, Dominik Saar wrote:

> Date: Fri, 20 Oct 2006 16:04:39 +0200
> From: Dominik Saar <dominik.saar at 1und1.de>
> To: Jeff A. Earickson <jaearick at colby.edu>, dovecot at dovecot.org
> Subject: Re: [Dovecot] performance problems with rc10 and solaris 10
> 
> Hi,
>
> i made all changes in /etc/system and in dovecot.conf
> the server has now the double amount of ram
>
> no changes ....
>
> same warnings
>
> Memory: 4096M real, 3283M free, 624M swap in use, 4217M swap free
>
> dovecot: Oct 20 16:02:58 Warning: IMAP(saar): Growing pool 'storage' with:
> 1024
> dovecot: Oct 20 16:02:58 Info: IMAP(saar): dirsize quota limit = 750000kB
> dovecot: Oct 20 16:02:58 Warning: IMAP(saar): Growing data stack with: 32768
> dovecot: Oct 20 16:02:58 Warning: IMAP(saar): Growing data stack with: 65536
> dovecot: Oct 20 16:02:59 Warning: IMAP(saar): Growing data stack with: 131072
> dovecot: Oct 20 16:02:59 Warning: IMAP(saar): Growing pool 'uidlist
> record_pool' with: 32768
>
> Dominik
>
> On Thursday 19 October 2006 16:27, you wrote:
>> Hi,
>>
>> I am running dovecot rc10 on a Sun E220R (sparc) for 3000 users with
>> Solaris 10 version 6/06 plus current patches.  While the performance isn't
>> great (it is a slow 2 cpu x 450 MHz box), it isn't bad either.
>>
>> I use mbox format (/var/mail is NFS mounted) and ZFS for home directories.
>> Authentication is via PAM.  PAM uses kerberos to Active Directory.
>>
>> I have the following in my /etc/system file for dovecot:
>>
>> * double file descriptor limits for dovecot
>> set rlim_fd_cur = 65536
>> set rlim_fd_max = 131072
>>
>> I also discovered that I need this setting in my dovecot.conf, or it
>> will fail over with the "shutting down too early/too many open files"
>> problem that is often discussed on this list:
>>
>> login_process_per_connection = no
>>
>> Are you sure that your E450 isn't swapping?  The "growing data stack"
>> sounds like lack of memory/swap issues.
>>
>> Jeff Earickson
>> Colby College
>>
>> On Thu, 19 Oct 2006, Dominik Saar wrote:
>>> Date: Thu, 19 Oct 2006 14:04:03 +0200
>>> From: Dominik Saar <dominik.saar at 1und1.de>
>>> To: dovecot at dovecot.org
>>> Subject: [Dovecot] performance problems with rc10 and solaris 10
>>>
>>> Hi,
>>>
>>> i have 2 dovecot imap server running on solaris 10
>>>
>>> The primary server with dovecot 1.0.alpha4 is running with best
>>> performance on Sun Sparc E4k5 with 8x 450MHz
>>>
>>> The secondary with rc10 has ugly performanceproblems on Sun E450 wth 4x
>>> 450MHz. Every new imap process takes permanent 25% cpu usage
>>>
>>> List the folder and fetch message are both slowy!
>>>
>>> Both servers are configred with ldap backend
>>>
>>>
>>> preventive i deleted for rc10 the complet index and controlfiles,
>>> because the spooldir is a sync from the masterserver with dovecot
>>> alpha4. I thought its a little bit slowy because of my 30.000 mails.
>>>
>>> the indexfiles are created now, but the still ugly slow ....
>>>
>>> For debugging i compiled rc10 again --with-debug=yes and start dovecot
>>> with solaris truss
>>>
>>> truss tells nothing to explain this behavor
>>> logentrys from dovecot has this warnings:
>>>
>>> -->
>>>
>>> dovecot: Oct 18 14:51:47 Warning: IMAP(saar): Growing pool 'storage'
>>> with: 1024
>>> dovecot: Oct 18 14:51:47 Info: IMAP(saar): dirsize quota limit =
>>> 750000kB
>>> dovecot: Oct 18 14:51:47 Warning: IMAP(saar): Growing data stack with:
>>> 32768
>>> dovecot: Oct 18 14:51:47 Warning: IMAP(saar): Growing data stack with:
>>> 65536
>>> dovecot: Oct 18 14:51:48 Warning: IMAP(saar): Growing data stack with:
>>> 131072
>>> dovecot: Oct 18 14:51:48 Warning: IMAP(saar): Growing pool 'uidlist
>>> record_pool' with: 32768
>>>
>>> <--
>>>
>>> also i compiled rc10 --with-notify=none, no result
>>>
>>> to ensure it isn´t the solaris system, i compiled alpha4.
>>> Result: good performance
>>>
>>> Any ideas?
>>>
>>> Cheers
>>>
>>> Dominik
>
> -- 
> Dominik Saar
>
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