[horde] Problem of slow with server-side sorting

[Jose Luis Marin Perez]

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

> 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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