NVIDIA® HPC-X® is a comprehensive software package that includes MPI and SHMEM communications libraries. HPC-X also includes various acceleration packages to improve both the performance and scalability of applications running on top of these libraries, including UCX (Unified Communication X), which accelerates the underlying send/receive (or put/get) messages. It also includes HCOLL, which accelerates the underlying collective operations used by the MPI/PGAS languages.
The documentation here relates to HPC-X:
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