[imp] upgrade from IMP3 -> IMP4 : serious performance hit

[Myke Place]

I should probably mention that after my earlier reply, I went back and 
found a setting that made a *huge* difference on our installation.

Setting $conf['server']['sort_limit'] to anything other than '0' (I went 
with 100) caused load to drop from between 10.0-15.0 to about 1.3.

I thought I'd put that out there in case anybody else missed that very 
important setting.

-mp


Chris J. Alexander wrote:

>Just to keep the list updated - we configured two additional Sun v240 servers
>this morning into our production mix, and are monitoring to see how this will
>help performance.  So far so good - thanks to all who offered suggestions and
>moral support (both equally important!)
>
>CJA
>Quoting "Chris J. Alexander" <cjalexa at emory.edu>:
>
>  
>
>>The only two that I had enabled were
>>
>>$conf['mailbox']['show_attachments'] & $conf['mailbox']['show_xpriority']
>>
>>which I have now disabled.  The load is still climbing though.
>>
>>Is the new Horde/IMP much more DB intensive?  Perhaps I need to focus on the
>>MySQL installation?  That process seems very 'hot' now, much more so than
>>before.  But if the app needs that extra DB interaction, there isn't 
>>much I can
>>do beyond throw hardware at the problem.  Is there a quick'n'dirty way to
>>profile what's eating all my CPU?  I've tried truss'ing the processes but
>>gleaned nothing helpful.  Error logging is turned up, but not 
>>revealing anything
>>to me either.
>>
>>I am using the Horde VFS with the MySQL DB on the one server, but 
>>again that was
>>being used before as well.  I tried very hard to make sure the *only* 
>>change was
>>the upgrade from IMP 3 -> IMP 4.
>>
>>There are a total of 4000 sessions in the DB split among the two 
>>Solaris boxes -
>>these are v280R's w/ 4 GB of RAM, that should be plenty of headroom, 
>>shouldn't
>>it?
>>
>>Thank you for continued help :)
>>
>>CJA
>>
>>----- Original Message -----
>>From: "Jan Schneider" <jan at horde.org>
>>To: <imp at lists.horde.org>
>>Sent: Tuesday, July 19, 2005 11:38 AM
>>Subject: Re: [imp] upgrade from IMP3 -> IMP4 : serious performance hit
>>
>>
>>    
>>
>>>Zitat von "Chris J. Alexander" <cjalexa at emory.edu>:
>>>
>>>
>>>      
>>>
>>>>Is this just a symptom that I need much much larger hardware to run the new
>>>>version of Horde for my installation?  My higher ups are screaming at
>>>>me every
>>>>hour to do something about it; I don't want to downrev if I can help
>>>>it, but I
>>>>may not have a choice since I can't produce new hardware that fast.
>>>>        
>>>>
>>>It's a fact that Horde 3/IMP 4 need more power than Horde 2/IMP 3, but
>>>not *that* much more. Did you try disabling all perfomance hungry
>>>configuration settings in IMP?
>>>
>>>Jan.
>>>
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>
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