On Tuesday 30 June 2009, Hamish wrote: > buraq wrote: > > I have a notebook with T7200 Intel CPU and r.sun completes > > one day's calculation between 3-4 mins(with linke turbidity raster > > and shadowing, step = 1). I want to run r.sun with step=0.5 in a > > large scale and detailed area. > > So, I need to reduce the calculation time for calculating 365 day data. > > Could you give me advices about hardware for reducing > > calculation time? > > see tips here: > http://grass.osgeo.org/wiki/r.sun > > (run r.horizon first) > > 24 hours to complete isn't so bad :) > suggestion: to take advantage of dual processor split up operations and > (if running linux) run two concurrent mapsets for day 0-180 and 181-365. > then when done use g.mapsets to add second mapset to first's search path. > > wish: someone in the know adds OpenMP* support to r.sun > [*] (or pthreads, but OpenMP seems easier) > http://grass.osgeo.org/wiki/OpenMP > > > Hamish >
Not trying to honk one's own horn, but an application of r.sun and time requirements was recently published here: http://soil.scijournals.org/cgi/content/abstract/73/4/1345 Let me know if you want a PDF Dylan -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341 _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
