[imp] Horde/IMP performance and system requirements (50k+ accounts)

Jie Gao J.Gao at isu.usyd.edu.au
Tue Mar 24 22:16:23 UTC 2009

* Michael M Slusarz <slusarz at horde.org> wrote:

> >* Janne Peltonen <janne.peltonen at helsinki.fi> wrote:
> >
> >>Hi!
> >>
> >>We've been running IMP here at the University of Helsinki since 2001,
> >>and performed a major upgrade last summer, straight into Horde Webmail
> >>Edition 1.1.1. Since then, there has been no end of problems we've been
> >>running into, most notably all kinds of performance problems
> >>- so much so that we've been considering moving out of Horde/IMP
> >>altogether. At least my boss is getting convinved that Horde just
> >>doesn't work.
> >
> >We have 80k user accounts here. We tried to upgrade from 2.* to 3.*
> >a few years ago and had to rollback due to a performance problem caused
> >by a bad sql query in the code; adding more resources did not help.
> >
> >We tried again with Horde Webmail Edition a few weeks ago, and we had
> >plenty of resources ready: 6 front-end redhat servers (in vmware - not
> >my preference though), and a dual Quad-Core AMD Opteron redhat server
> >(16GB mem) for the mysql database (it is used as a front-end server as
> >well now).
> >
> >We immediately encountered performance problem, and found that it was
> >caused by dynamic address matching in the compose window, and as it
> >would match almost everything when you type in the first letter of an
> >email address, our ldap server was brought to its knees!
> See http://bugs.horde.org/ticket/7322 - the threshold for searching is  
> now configurable in IMP.  Additionally, there is an option that when a  
> compose window is opened, if a user has below a certain number of  
> contacts all of those contacts are loaded into the browser and any  
> autocomplete search is done entirely on the browser side.  This is  
> only in IMP 5 however.
> In IMP 4 this can be worked around by modifying imp/js/autocomplete.js  
> - set 'minChars' to the number of characters desired before a search  
> is triggered.

Thanks very much for the tip. Much appreciated.



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