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This paper describes an implementation of the Message Passing Interface (MPI) on the Portals 3.0 data movement layer. Portals 3.0 provide low-level building blocks that are flexible enough to support higher-level message passing layers such as MPI very efficiently. Portals 3.0 is also designed to allow for programmable network interface cards to offload message processing from the host processor, allowing for the ability to overlap computation and MPI communication. This paper describes the basic building blocks in Portals 3.0, show how they can be put together to implement MPI, and describe the protcols of the MPI implementation.
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