Wait-free message passing protocol for non-coherent shared memory architectures

Isaías A. Comprés Ureña, Michael Gerndt, Carsten Trinitis

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The number of cores in future CPUs is expected to increase steadily. Balanced CPU designs scale hardware cache coherency functionality according to the number of cores, in order to minimize bottlenecks in parallel applications. An alternative approach is to do away with hardware coherence entirely; the Single-chip Cloud Computer (SCC), a 48 core experimental processor from Intel labs, does exactly that. A wait-free protocol for message passing on non-coherent buffers was introduced with the RCKMPI library, in order to support MPI on the SCC. In this work, the message passing performance of the protocol is modeled. Additionally, a port for symmetric multi-processors is introduced and used for comparison with MPICH2-Nemesis and Open MPI. Performance is analyzed based on statistics collected on a 4-dimensional space composed of source rank, target rank, message size and frequency.

Original languageEnglish
Title of host publicationRecent Advances in the Message Passing Interface - 19th European MPI Users' Group Meeting, EuroMPI 2012, Proceedings
Pages142-152
Number of pages11
DOIs
StatePublished - 2012
Event19th European MPI Users' Group Meeting on Recent Advances in the Message Passing Interface, EuroMPI 2012 - Vienna, Austria
Duration: 23 Sep 201226 Sep 2012

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume7490 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference19th European MPI Users' Group Meeting on Recent Advances in the Message Passing Interface, EuroMPI 2012
Country/TerritoryAustria
CityVienna
Period23/09/1226/09/12

Keywords

  • MPI
  • communication protocol
  • message passing
  • non-blocking
  • non-coherent shared memory
  • wait-free

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