Single sided MPI implementations for SUN MPIr

Authors:
S. Booth;E. Mourao
Affiliations:
EPCC, The University of Edinburgh, JCMB, The King's Buildings, Mayfield Road, Edinburgh EH9 3JZ;EPCC, The University of Edinburgh, JCMB, The King's Buildings, Mayfield Road, Edinburgh EH9 3JZ
Venue:
Proceedings of the 2000 ACM/IEEE conference on Supercomputing
Year:
2000

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Abstract

This paper describes an implementation of generic MPI-2 single-sided communications for SUN-MPI. Our implementation is layered on top of point-to-point MPI communications and therefore can be adapted to other MPI implementations. The code is designed to co-exist with other MPI-2 single-sided implementations (for example, direct use of shared memory) providing a generic fall-back implementation for those communication paths where an optimized single-sided implementation is not available. MPI-2 single-sided communications require the transfer of data-type information as well as user data. We describe a type packing and caching mechanism used to optimize the transfer of data-type information. The performance of this implementation is measured in comparison to equivalent point-to-point operations and the sharedmemory implementation provided by SUN.