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Here you can find some useful details on how to use them on Marconi100.
Warning: When you compile your code using the XL compiler with Spectrum-MPI parallel library (our recommended software stack) you have to use mpirun (not srun) to execute your program.
Spectrum-MPI
It is an IBM implementation of MPI. Together with XL compiler it is the recommended enviroment to be used on Marconi100.
In addition to OpenMPI it adds unique features optimized for IBM systems such as CPU affinity features, dynamic selection of interface libraries, workload manager integrations and better performance.
Spectrum-MPI supports both CUDA-aware and GPUDirect technologies.
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