[QGIS-Developer] Question

[Marco Hugentobler]

Hi Guillaume


 >My question: Is there a way to take advantage of the fact that I have 
32 cores on my computer with QGIS to make this calculation? I don't 
understand why it is so slow.


Yes, there is. Compile the code from the 
'processing_multithreaded_vector' branch in my repo 
(https://github.com/mhugent/QGIS/tree/processing_multithreaded_vector). 
It calculates the difference operation on multiple cores (see also 
https://github.com/qgis/QGIS/pull/33365).


Regards,

Marco


Am 22.10.20 um 03:05 schrieb guillaume martel:
> Hi,
>
> I don't know if I'm writing at the wrong place...
>
> I have 2 shapefiles and I want to do a "difference operation" 
> (https://docs.qgis.org/3.10/en/docs/user_manual/processing_algs/qgis/vectoroverlay.html).
>
> My issue is as follow: Even though I have a powerful computer, after 5 
> days the calculation is only at 5%.
>
> My question: Is there a way to take advantage of the fact that I have 
> 32 cores on my computer with QGIS to make this calculation? I don't 
> understand why it is so slow.
>
> Thank you for your help.
>
> Guillaume
>
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-- 
Dr. Marco Hugentobler
Sourcepole -  Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch

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