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Why MPI shared memory?

In this article we explain some usage areas for MPI shared memory, for example using shared memory for applications with "replicated data".

So what is MPI shared memory actually for? There are several usage areas: One is for applications with “replicated data”, another possibility is the reduction of communication overhead within shared memory nodes.

For further self-study, you can find the figure of the video together with the text in the pdf handout for weeks 3-4 on page 7.

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One-Sided Communication and the MPI Shared Memory Interface

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