[R-sig-hpc] Use GPU in R with .Call

[Simon Urbanek]

On Jul 22, 2012, at 5:41 PM, Norm Matloff wrote:

> I'm not exactly sure what you are asking, Raymond, but this may answer
> your question.
> 
> Say you have a file x.cu.  After compiling with nvcc -c as you did, then
> do something like this:
> 
> setenv PKG_LIBS "-L/usr/local/cuda/lib -lcudart"
> R CMD SHLIB x.o -o x.so
> 
> PKG_LIBS is an environment variable used by R CMD SHLIB.
> 

FWIW the above will only work in csh (this is after many years that I see someone positing advice based on csh - I thought it died out ;)) and Rtools don't have csh (unsurprisingly).

It's much easier and more portable to simply pass the flags directly to SHLIB - it's not a package after all. In Raymond's case something like

R CMD SHLIB VecAdd_cuda.c  VecAdd_kernel.o -lcudart

Add -L if needed, but on Windows it's typically easiest to have DLLs in the same directory. I don't use CUDA so if in doubt, ask nvidia specialists for the exact flags.

Cheers,
Simon


> Of course, you need to translate the setting of the environment variable
> from Linux C shell to Windows, and substitute your location of the CUDA
> library.
> 
> Norm
> 
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