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Blurring the computation-communication divide : extraneous memory accesses and their effects on MPI intranode communications

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Tan, Wilson M. and Jarvis, Stephen A. (2012) Blurring the computation-communication divide : extraneous memory accesses and their effects on MPI intranode communications. In: 2012 Imperial College Computing Student Workshop, London, United Kingdom, 27-28 Sept 2012. Published in: 2012 Imperial College Computing Student Workshop, ICCSW 2012 ISBN 978-393989748-4. doi:10.4230/OASIcs.ICCSW.2012.135

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Abstract

Modern MPI simulator frameworks assume the existence of a Computation-Communication Divide: thus, they model and simulate the computation and communication sections of an MPI Program separately. The assumption is actually sound for MPI processes that are situated in different nodes and communicate through a network medium such as Ethernet or Infiniband. For processes that are within a node however, the validity of the assumption is limited since the processes communicate using shared memory, which also figures in computation by storing the application and its associated data structures. In this work, the limits of the said assumption's validity were tested, and it is shown that Extraneous Memory Accesses (EMAs) by a compute section could significantly slow down the communication operations following it. Two general observations were made in the course of this work: first, more EMAs cause greater slowdown; and second, EMAs coming from the compute section of the processes containing the MPI-Recv are more detrimental to communication performance than those coming from processes containing MPI Send.

Item Type: Conference Item (Paper)
Divisions: Faculty of Science > Computer Science
Journal or Publication Title: 2012 Imperial College Computing Student Workshop, ICCSW 2012
ISBN: 978-393989748-4
Official Date: 2012
Dates:
DateEvent
2012Published
DOI: 10.4230/OASIcs.ICCSW.2012.135
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Conference Paper Type: Paper
Title of Event: 2012 Imperial College Computing Student Workshop
Type of Event: Workshop
Location of Event: London, United Kingdom
Date(s) of Event: 27-28 Sept 2012
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