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How to allocate a shared memory?

In this step we explain how the allocation of shared memory technically works. You will first split the given communicator into shared memory islands.

How does it technically work? In this step, you first split the given communicator in its shared memory islands. Then your processes of each island together allocate a shared memory window.

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 10.

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One-Sided Communication and the MPI Shared Memory Interface

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