[horde] Problem of slow with server-side sorting

[Steve Devine]

Quoting "Jose Luis Marin Perez" <jolumape_al at hotmail.com>:

>
>
> Thanks for your answers.
>
> These hardware features:
>
> ML370 G4
> Xeon 3.6 GHz CPU
> 1 GB RAM
> Hard Drive 300GB - Raid 1 - EXT3
>
> When accessing one of these accounts capture a sample of the TOP command
>
> top - 09:37:51 up 4 days, 15:26,  2 users,  load average: 5.07, 4.85, 4.79
> Tasks: 146 total,   1 running, 145 sleeping,   0 stopped,   0 zombie
> Cpu(s): 46.5% us, 19.8% sy,  0.0% ni, 19.8% id, 13.9% wa,  0.0% hi,  0.0% si
> Mem:   1034512k total,  1008464k used,    26048k free,    55592k buffers
> Swap:  2048276k total,   143232k used,  1905044k free,   516016k cached
>
> On our server there are about 5000 mail accounts with more than 1000  
> messages per account.
>
> As can enable an option _imp_hook_msglist_format and that benefits  
> could give me to solve my problem?
>
> Regarding the questions of Steve Devine:
>
> There are 3 webmails configured for accessing the IMAP server and  
> have approximately 200 to 300 concurrent users
>
> MAXPERIP = 256
> MAXDAEMONS = 40
>
> Thanks
>
> Jolumape

Looks like your RAM is used up and your running into swap. Get more memory.
Is IMAP the only thing running on this machine?
>
>> Date: Wed, 3 Jun 2009 10:55:17 +0200
>> From: rsalmon at mbpgroup.com
>> To: jolumape_al at hotmail.com
>> CC: horde at lists.horde.org
>> Subject: Re: [horde] Problem of slow with server-side sorting
>>
>> Jose Luis Marin Perez <jolumape_al at hotmail.com> a écrit :
>>
>> >
>> > Thank you very much for your replies.
>> >
>> > I am clear that the problem of slowness is caused by Courier-Imap.
>>
>> It could be your hardware or filesystem.
>> Check the load of your server when accessing your mailbox, is there a
>> proc eating the CUP or is it doing nothing ?
>>
>>
>> Here, we use courier-imap 4.3. Maildirs are stored on a RAID5(PERC
>> 5/i) disk (ext3).
>> We don't have many users here, but all of them have thousands of
>> emails (too many!) in their mailbox (Some of them still don't (or
>> don't want to) know that they can create sub-folders :-()
>>
>> I've just tried sorting by date/thread/... folders containing about
>> 5000 emails and it took less than 5 seconds. The first access to the
>> folder takes about 10s though.
>>
>> The hook _imp_hook_msglist_format is also enabled, so courier-imap has
>> to read every emails.
>>
>>
>> Ronan.
>
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Steve Devine
Email & Storage
Academic Technology Services
Michigan State University

313 Computer Center
East Lansing, MI 48824-1042
1-517-432-7327