[Qgis-developer] Multi-threaded version and attribute table

[Matthias Kuhn]

On Mon 13 Jan 2014 02:05:07 PM CET, Andreas Neumann wrote:
> Hi,
>
> There is more information:
>
> Postgis table works fast if the "Select at ID" checkbox is turned off.
> If it is turned on it is unbelievably slow - loading only 1 to 4
> features at the time.
>
> The "Select at ID" has something to do with the local caching of the
> table, doesn't it?

For dataproviders which don't support SelectAtId, a locally cached copy 
of the complete dataset is made for the lifetime of the attribute table 
(because on-demand loading while scrolling would require a new full 
scan)
For others, the whole dataset is loaded, but only a certain number of 
features (10000 by default) are cached locally.

Matthias

>
> Andreas
>
> Am 13.01.2014 13:56, schrieb Andreas Neumann:
>> I should have mentioned that I tested with a Postgis layer. With
>> SpatiaLite it works much faster.
>>
>> Andreas
>>
>> Am 13.01.2014 13:54, schrieb Andreas Neumann:
>>> Hi Martin,
>>>
>>> I tested the multi-threaded version with the latest version from git
>>> regarding the attribute table. I noticed a problem when loading the
>>> features for the table. It loads extremely slow, approx. 4 features per
>>> second. It looks like each of the thread just loads one feature at the
>>> time, or something similar. A table of 60'000 features which I tested
>>> would take forever.
>>>
>>> Is this a known issue?
>>>
>>> Thanks for having a look at this.
>>>
>>> Andreas
>>> _______________________________________________
>>> Qgis-developer mailing list
>>> Qgis-developer at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>>>
>>
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