[GRASSLIST:5836] Re: Spawning processes

[Glynn Clements]

Jose Luis Gomez Dans wrote:

> I need to process a large data set with s.surf.rst (I
> went back to using 
> 5.4 due to Bug#2903). The idea is to spawn several
> s.sur.rst processes 
> on an SMP machine, each with a different region (set
> to have some 
> overlapping). The individual rasters are then patched
> together into a 
> single large raster file.
> 
> The idea is to have a script doing this
> g.region north=.... south=...
> s.surf.rst <params> &
> g.region north=... south=...
> s.surf.rst <params>&
> 
> This of course, assumes that once s.surf.rst is
> called, the region 
> information is no longer used, and can be changed for
> the next process 
> to use a different region.
> 
> Can anyone see any showstoppers in this?

At a minimum, you need to introduce a delay between starting
s.surf.rst in the background and changing the region, otherwise the
region might get changed before s.surf.rst actually reads it.

-- 
Glynn Clements <glynn at gclements.plus.com>