[Qgis-user] Qgis low CPU and Memory load

[Nicolas Cadieux]

Hi,

You can also activate the OpenCL option.  Some algorithms have been optimized (I believe it’s still experimental).  If you have a compatible  OpenCL video card, it will run these on the card.  If not, it can probably run on compatible CPUs. 

https://www.itopen.it/opencl-acceleration-now-available-in-qgis/

I find it’s worth testing equivalent algorithms from different sources in the Processing plugin is worth the trouble.  Some Saga algorithm are faster.  Merging vector lines, for example, could take a long time using the QGIS algorithm (talking hours) and was much faster (a few minutes) using the Saga version of the tool.  I also found that some algorithms are much faster to handle when the files are not open beforehand in the layer manager.  For example, the Processing plugin can sometimes grab the needed files directly on the hard drive rather than picking one that is already open in the layer manager. Looking at the processor, memory and disk usage can also help identify bottle necks in the hardware.  

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 16 avr. 2021 à 03:34, Francesco Pelullo <f.pelullo at gmail.com> a écrit :
> 
> 
> 
> 
> Il ven 16 apr 2021, 02:56 Stewart Holt <stewartbholt at gmail.com> ha scritto:
>>  Parallelizing script execution is complex and I doubt that it is currently done in QGIS.
> 
> 
> That's true.
> 
> In Settings / Options / Rendering / there's a checkbox for render layers in parallel using as many CPU cores you want, but It Is enabled by default so I suppose that there are no others settings that could make QGIS more aggressive in CPU usage.
> 
> 
> Regards
> 
> 
> 
>> 
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