[imp] imp with courrier imap is too slow

[Kent Martin]

I too am running imp with courier IMAP.  I have a CVS cut from February 
that runs like a dream, but the RCs are woefully slow.  There is nothing 
tricky about my setup, it is a pretty standard single box type deal 
running php 4.3.9, apache 2 and courier-imap.

I tried introducing php acceleration, but it hasn't helped.  IMAP proxy 
is in place - well, the RCs have configs as close as possible to the CVS 
cut that works well.

Cheers,

Kent.

Alain Fauconnet wrote:

>On Sat, Dec 04, 2004 at 01:50:10PM -0600, Dan H wrote:
>  
>
>>I don't know if this is the default or not but are you using a Maildir 
>>format or
>>an Mbox format?  Maildir is wonderful.  Much faster than Mbox in my 
>>opinion.
>>    
>>
>
>As far as I know Courier IMAP only does Maildir, so there's no choice.
>
>  
>
>> I
>>get tons of spam every day but I don't experience a bit of lag.  Granted I
>>don't get 1200 pieces but it isn't uncommon for me to go into my mailbox and
>>have over a hundred new messages.  And since I'm terrible about putting my
>>messages in folders I often have a few hundred messages total in my inbox.
>>Never have a problem with speed when using Courier.
>>    
>>
>
>Neither did I, or at least they  were  much  less  severe  than  using
>UW-IMAP  and  mbox.  I  once  managed  a  busy 80K mailbox mail server
>running off a not-so-hot Sun E420 server  with  software  RAID-1  SCSI
>storage   of   old   technology,  definitely  not  an  impressive  I/O
>bandwitdth.  The  system was busy but reasonably fast, even under spam
>attacks.  IMP itself was running off a separate commodity hardware PC.
>No IMAP proxy. Many users did have in excess of 1,000  messages  in  a
>single mailbox.
>
>So  basically,  IMP  running  in front of Courier IMAP should give you
>good performance. If it doesn't, then you have a bottleneck somewhere.
>You  don't  give  any  information about the underlying hardware, O/S,
>filesystem etc. I'd bet that your bottleneck is disk I/O  or  lack  of
>memory     causing    filesystem    caches    to    be    ineffective.
>
>You're not accessing mailboxes over  NFS  are  you?  This  is  a  real
>performance killer.
>
>Greets,
>_Alain_
>  
>