Building and Using LLVM/Clang 7.0 with OpenMP Offloading to NVIDIA GPUs

Runtimes OpenMP
#1

Jonas,
I’m re-reading your instructions and now am wondering what env vars related to CUDA Toolkit installations are required when building Clang?

I’m having a hard time in the last couples of days matching the Clang building env and runtime env.

Thanks,
Itaru.

#2

Jonas,

If addressing me, please include my email address to make sure it ends
up in my inbox. Otherwise messages sent only to the mailing lists get
filtered into folders that I may read / scroll over from time to time.

I’m re-reading your instructions and now am wondering what env vars related to CUDA Toolkit installations are required when building Clang?

None that I'm aware of, at least I didn't set any in addition to those
by our 'module'. IIRC Clang detects CUDA installations by looking for
the first 'ptxas' in PATH. Unless that changed, make sure that clang -v
prints the right installation and you should be good.

Jonas

#3

Jonas,
Could you tell me how the module file is written, removing
system-specific information, but
leaving relevant for the CUDA Toolkit installation? The path to binary
needs to be in PATH,
and libraries in LD_LIBRARY_PATH I suppose, but not sure if there
needs to be other than that.

#4

Jonas,
Could you tell me how the module file is written, removing
system-specific information, but
leaving relevant for the CUDA Toolkit installation? The path to binary
needs to be in PATH,
and libraries in LD_LIBRARY_PATH I suppose, but not sure if there
needs to be other than that.

Yes, that should be the relevant ones (plus maybe CPATH, but CMake
should add the include directory itself) - as I said nothing special.
The other variables are not actually required, but are set for user
convenience like CUDA_ROOT.

#5

This is what "module show" lists for our cuda/10 module:

prepend-path PATH /usr/local/sw/cuda/10.2.89/bin :
prepend-path PATH /usr/local/sw/cuda/10.2.89/computeprof/bin :
prepend-path PATH /usr/local/sw/cuda/10.2.89/nvvm/bin :
prepend-path CPATH /usr/local/sw/cuda/10.2.89/include :
prepend-path LD_LIBRARY_PATH
/usr/local/sw/cuda/10.2.89/lib64:/usr/local/sw/cuda/10.2.89/lib64/lib64 :
prepend-path LD_LIBRARY_PATH /usr/local/sw/cuda/10.2.89/computeprof/bin :
prepend-path LD_LIBRARY_PATH /usr/local/sw/cuda/10.2.89/nvvm/lib64 :
prepend-path LD_LIBRARY_PATH /usr/local/sw/cuda/10.2.89/extras/CUPTI/lib64 :
prepend-path LIBRARY_PATH /usr/local/sw/cuda/10.2.89/nvvm/libdevice :
prepend-path MANPATH /usr/local/sw/cuda/10.2.89/doc/man :

Hope this helps,

Joachim