[Scons-users] OpenMP and MPI

[Russel Winder]

On Mon, 2015-01-26 at 10:22 +0100, Florian Lindner wrote:
> Hello,
> 
> I'm working on a program that uses both MPI and OpenMP. gcc and icc require 
> different compiler flags -openmp / -fopenmp.
> 
> Furthermore when using MPI you usually use a compiler wrapper like mpicc / 
> mpicxx / mpic++ where you don't see the compiler behind.
> 
> What's the best scons way to deal with that? Current idea is
> 
> if compiler = "g++":
>   env.Append(CCFLAGS = ['-fopenmp'])
>   env.Append(LINKFLAGS = ['-fopenmp'])
> elif compiler = "icc"
>   # likewise
> elif compiler.startswith("mpi"):
>   # execute $compiler -show with gives output like that
>   # g++ -pthread -Wl,-rpath -Wl,/usr/lib/openmpi [...]
>   # and parse that output

Are you using specific SCons tools or just the default tool set? I am
guessing the latter.

For MPI, I always explicitly set compiler to mpic++. 

Put this together and I am not sure I would advocate the if you have.

Is there a small project that we could bandy about to iterate to a "best
practice"?

> 
> Is using subprocess to execute external processes ok? Any better way?

It is, but it shouldn't be needed.

-- 
Russel.
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