SC13 Home > SC13 Schedule > SC13 Presentation - Handling Datatypes in MPI-3 One Sided

SCHEDULE: NOV 16-22, 2013

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Handling Datatypes in MPI-3 One Sided

SESSION: ACM Student Research Competition Poster Reception

EVENT TYPE: ACM Student Research Competition Posters, ACM Student Research Competition

TIME: 5:15PM - 7:00PM

AUTHOR(S):Robert Gerstenberger

ROOM:Mile High Pre-Function

With the rise of modern interconnects offering direct remote memory access (RDMA), one sided programming becomes increasingly popular. The MPI-3.0 one sided chapter specifies a programming interface that leverages these features directly. foMPI (fast one-sided MPI) was introduced as a reference implementation to provide highest performance and minimal overheads. Many applications have to communicate non-consecutive data. In message passing each partner specifies their own MPI datatype (a memory layout), while for one sided communication one process defines both types (for the origin and the target process), which requires different kinds of optimizations for truly one sided implementations. In this work three different strategies are proposed to handle the combination of those MPI datatypes and implement them in foMPI. Those strategies were evaluated with DDTBench, a set of data access pattern micro-applications, which were extended to handle one sided communication. Some cases improved up to a magnitude.

Chair/Author Details:

Robert Gerstenberger - Chemnitz University of Technology

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