[GRASS-user] Calling GRASS command in multi-threads

Paulo van Breugel p.vanbreugel at gmail.com
Sat Dec 29 04:13:47 PST 2012

Perhaps this will give you some useful pointers: 

On 12/29/2012 01:03 PM, Paul Meems wrote:
> Hi list,
> Last night my test script successfully finished processing my small 
> area and created a annual solar radiation raster.
> I did a comparison with the solar radiation produced by ArcMap and 
> noticed its radiation is almost twice as high as the one produced by 
> Grass. Probably I'm not using the correct output files.
> I'm using glob_rad from r.sun as my result. I will have a closer look 
> why this difference is happening.
> If anyone can give me some pointers that would be must appreciated.
> My real question today is how to speed up the process. My script took 
> 7 hours to finish, but only used a fraction of the available 
> resources. While running the script (on Windows) only 30% of my 
> quadcore CPU was used and only 3GB of my 8GB RAM.
> Since I'm looping on r.sun, calling it 365 times I was thinking of 
> calling it several times at once.
> Is this possible? Calling r.sun 4 or 5 times at once will decrease the 
> time for the script to workable proportions.
> Probably this is more of a Python question than a GRASS question but 
> any pointers would be very helpful.
> Thanks,
> Paul
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