GPU

Comments from the mailing list concerning GRASS and GPU parallelization:

As I understand it, CUDA is 100% dependent on the closed-source binary driver from nVidia and works on their video cards alone. Which is fine for today for people with nVidia hardware using their binary video card driver. If nVidia decides in a couple of years to stop supporting CUDA, your old card, your specific OS or distro, your OS or distro version+cpu type, or if they go out of business or are bought/sold to another company who is not interested, any code based on it becomes useless. For this reason code written for an open platform such as OpenCL, even if less advanced, seems to have a brighter long-term future. -- HB

Support for double precision floating point values must be retained for calculations which deal with positional data. For elevation and radiometric data floating point precision may be enough.

Modules of interest to be parallelized

The target version will be GRASS 7 (alias SVN trunk).

v.in.ogr or → underlying vector library functions to build topology and spatial index ←
v.surf.rst
v.vol.rst
- (probably best to focus on the RST library first)
r.viewshed
v.surf.bspline
r.sun
r.proj
v.proj
v.net.* ???
raster library (typically I/O-bound)
...
~~r.mapcalc~~ (already has pthreads support; probably I/O-bound)
~~r.los~~ (to be replaced by r.viewshed after last few bugs are fixed)
~~i.rectify~~ (internal code to be replaced by GDALwarp API; note that for the polynomial calcs it's partly the same exact code)

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