[Kolab-devel] Kontact Performance, once again...

[Till Adam]

On Tuesday 10 October 2006 17:06, Chris Hoy Poy wrote:

> I think part of the problem is the lousy write performance on
> synchronous NFS. It just has crap latency. the dimap is going to be
> doing a lot of small i/o operations and I dont think NFS handles it
> very well.

Indeed.

> Any latency issue there gets badly handled by Kontact - it has some
> issues backgrounding the i/o.

Right again. It's single threaded and therefor has to do manual chunking 
to avoid blocking the UI on I/O bound operations. Which means more, 
smaller operations, which is in turn bad for latency.

> This is a LOT better in KDEPIM-3.5.4, and I've had to drop the proko2
> stuff in favour of just running vanilla Kontact (FedoraCore5, 3.5.4
> if anyone cares) Its got all the functionality we need - not sure on
> the difference really. I preferred that to losing my job / health
> (those machines weigh a lot when someone throws them at you!)

It's interesting to hear that this is significantly better in 3.5. This 
could be related to the changes in the config writing there, since the 
sync mechanism is fundamentally much the same in both branches. There 
have been other improvements in that branch as well, of course, and a 
3.5 based proko3 (or whatever it will be called) is somethig we (the 
Kolab Konsortium) are trying to fund atm.


-- 
Till Adam -- till at kdab.net, adam at kde.org
Klarälvdalens Datakonsult AB, Platform-independent software solutions
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