Horde speed

[Saim Kim]

Hello Gunnar,

thanks for the extensive explanation - one more reason to upgrade to RC3!
Indeed, I was experiencing an increasing time lag the more events I had 
in my calendar.

Best regards,
Saim


Gunnar Wrobel schrieb:
> Hi Saim,
>
> Saim Kim <s.kim at hia.rwth-aachen.de> writes:
>
>   
>> Hello,
>>
>> is it normal for the Horde Webclient calendar to be sluggish? I'm using 
>> the Kolab Server 2.2 RC 2 with the Horde option. I found an entry in the 
>> Kolabwikki about the "c-client patch". Is this patch already included in 
>> rc2?
>>     
>
> the answer to that is a little bit more involved and I'm temped to
> give an overview on Horde speed issues in general.
>
> All Horde/Kolab speed issues are basically focussed around the IMAP
> connection. About two years ago Horde was only able to contact the
> Kolab IMAP server, to list all folders of the user, and to load as
> well as parse the messages in a folder desired by the user.
>
> This happened on EVERY page view. If you clicked on a calendar link in
> Horde you'd get a massive amount of IMAP calls and once you more than
> a few dozen items in a Kolab folder (e.g. events or contacts) you'd
> notice a very serious delay.
>
> There are three levels on which this can be improved:
>
>   1) Speed of the IMAP connection in general
>
>   2) Caching of the items in a folder so that you don't have to
>      reparse all contacts, events, etc. on every page view.
>
>   3) Caching of the IMAP folders of a user so that Horde does not have
>      to query IMAP for a list of mailboxes on every page view.
>
> You mentioned the 'c-client patch'. This is level 1). And yes, it is
> included in the recent Kolab Server 2.2 release candidates. It is in
> fact a very central Kolab specific patch and has already been used in
> 2.1. The patch speeds up the IMAP connection as it provides the
> internal PHP IMAP implementation with functions that are essential for
> the Kolab Server. If PHP has not been patched with this the only
> alternative is to use the PEAR-Net_IMAP package which provides an
> alternative IMAP implementation but is significantly slower as it is
> purely implemented in PHP.
>
> So on level 1) the Kolab Server should be fine. At least the OpenPKG
> as it is usually harder to get PHP patched on the other
> distributions. I know that Gentoo supports the Kolab patch by now but
> Debian probably does not.
>
> Level 2), the caching of folder items such as events and contacts has
> been implemented in PHP by Thomas Jarosch and we worked together on
> getting this into Horde. This has been available within Horde for
> about a year now. BUT I did not build the Kolab server packages
> correctly and so anything up to Kolab Server 2.2 RC2 should be unable
> to actually write the cache. This should be fixed with RC3. So I
> expect Horde to be sluggish in case you have many items in your
> folders as they probably get reparsed on every page view.
>
> Level 3), the caching of folder lists went into Horde last week and is
> not yet finished. Currently all Horde installations still elicit IMAP
> calls on EVERY page view. Which means you will experience lags
> especially if your users have many folders. The coding I did last week
> has the capability to reduce the IMAP calls on a page view to
> zero. Removing the need for calls that open network connections brings
> a significant speed gain. But I would not expect this to hit the Kolab
> server on OpenPKG before the end of this year.
>
> Once all that is working in a stable fashion there might still be
> another round of speed optimizations by doing code profiling. That
> tends to help a lot with PHP too. But that has nothing to do with IMAP
> and is currently just a mental note in my head.
>
> To summarize the current status of the Horde web client speed when
> using it with Kolab: We are halfway there but you can still expect
> some unnerving delays.
>
> Cheers,
>
> Gunnar
>
>   
>> Best regards,
>> Saim
>>
>>
>> -- 
>> --------------------------------------------------------------------------
>> Dipl.-Ing. Saim Kim
>> Lehrstuhl fuer Medizinische Informationstechnik
>> Helmholtz-Institut fuer Biomedizinische Technik
>> RWTH Aachen
>> Pauwelsstr. 20, D-52074 Aachen
>> ---
>> Web:   http://www.medit.hia.rwth-aachen.de/
>> Tel:   +49-(0)241-80 23218
>> Fax:   +49-(0)241-80 82442
>> email: s.kim at hia.rwth-aachen.de
>> -------------------------------------------------------------------------- 
>>
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>> Kolab-users at kolab.org
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>>     
>
>   


-- 
--------------------------------------------------------------------------
Dipl.-Ing. Saim Kim
Lehrstuhl fuer Medizinische Informationstechnik
Helmholtz-Institut fuer Biomedizinische Technik
RWTH Aachen
Pauwelsstr. 20, D-52074 Aachen
---
Web:   http://www.medit.hia.rwth-aachen.de/
Tel:   +49-(0)241-80 23218
Fax:   +49-(0)241-80 82442
email: s.kim at hia.rwth-aachen.de
--------------------------------------------------------------------------