Performance of MPI sends of non-contiguous data [article]

Victor Eijkhout
<span title="2018-09-27">2018</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
We present an experimental investigation of the performance of MPI derived datatypes. For messages up to the megabyte range most schemes perform comparably to each other and to manual copying into a regular send buffer. However, for large messages the internal buffering of MPI causes differences in efficiency. The optimal scheme is a combination of packing and derived types.
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