Run-time analysis and instrumentation for communication overlap potential

Authors:
Thorvald Natvig;Anne C. Elster
Affiliations:
Norwegian University of Science and Technology, Trondheim, Norway;Norwegian University of Science and Technology, Trondheim, Norway
Venue:
EuroMPI'10 Proceedings of the 17th European MPI users' group meeting conference on Recent advances in the message passing interface
Year:
2010

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Abstract

Blocking communication can be runtime optimized into nonblocking communication using memory protection and replacement of MPI functions. All such optimizations come with overhead, meaning no automatic optimization can reach the performance level of handoptimized code.In this paper, we present a method for using previously published runtime optimizers to instrument a program, including measured speedup gains and overhead.The results are connected with the program symbol table and presented to the user as a series of source code transformations. Each series indicates which optimizations were performed and what the expected saving in wallclock time is if the optimization is done by hand.