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With the increasing prominence of many-core architectures and decreasing per-core resources on large supercomputers, a number of applications developers are investigating the use of hybrid MPI+threads programming to utilize computational units while sharing memory. An MPI-only model that uses one MPI process per system core is capable of effectively utilizing the processing units, but it fails to...
Exascale systems will present programmers with many challenges. The authors review the parallel programming models that are appropriate for such systems and the challenges that implementations of those models face in an exascale system. They also discuss the feasibility of using existing programming systems, thus preserving the investment in legacy applications, as well as the benefits and likelihood...
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