SCHEDULE: NOV 16-22, 2013

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Enabling Highly-Scalable Remote Memory Access Programming with MPI-3 One Sided

SESSION: Inter-Node Communication

EVENT TYPE: Papers, Awards, Best Paper Finalists, Best Student Paper Finalists

TIME: 11:00AM - 11:30AM

SESSION CHAIR: Rajeev Thakur

AUTHOR(S):Robert Gerstenberger, Maciej Besta, Torsten Hoefler

ROOM:405/406/407

ABSTRACT:
Modern interconnects offer remote direct memory access (RDMA) features. Yet, most applications rely on explicit message passing for communications albeit their unwanted overheads. The MPI-3.0 standard defines a programming interface for exploiting RDMA networks directly, however, its scalability and practicability has to be demonstrated in practice. In this work, we develop scalable bufferless protocols that implement the MPI-3.0 specification. Our protocols support scaling to millions of cores with negligible memory consumption while providing highest performance and minimal overheads. To arm programmers, we provide a spectrum of performance models for all critical functions and demonstrate the usability of our library and models with several application studies with up to half a million processes. We show that our design is comparable to, or better than UPC and Fortran Coarrays in terms of latency, bandwidth, and message rate. We also demonstrate application performance improvements with comparable programming complexity.

Chair/Author Details:

Rajeev Thakur (Chair) - Argonne National Laboratory

Robert Gerstenberger - ETH Zurich

Maciej Besta - ETH Zurich

Torsten Hoefler - ETH Zurich

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The full paper can be found in the ACM Digital Library