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By allowing computation/communication overlap, MPI nonblocking collectives (NBC) are supposed to improve application scalability and performance. However, it is known that to actually get overlap, the MPI library has to implement progression mechanisms in software or rely on the network hardware. These mechanisms may be present or not, adequate or perfectible, they may have an impact on communication...
Nowadays, high‐performance computing (HPC) infrastructure can consume several megawatts. This chapter provides a state‐of‐the‐art overview as regards energy efficiency in high‐performance computing (HPC) facilities while describing the open challenges the research community has to face in the coming years to enable the building and usage of an exascale platform by 2020. It presents an overview of...
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