Seminar Details:

LANS Informal Seminar
"Improving the Precision of Activity Analysis on MPI Programs"

DATE: November 11, 2009

TIME: 15:00:00 - 16:00:00
SPEAKER: Barbara Kreaseck, Associate Professor of Computer Science, La Sierra University
LOCATION: 1404&1405, Conference Center, Bldg 240, Argonne National Laboratory

Description:
Message passing via MPI is widely used in single-program, multiple-data (SPMD) parallel programs. Existing data-flow frameworks do not model the semantics of message-passing SPMD programs, which can result in less
precise and even incorrect analysis results. We present a data-flow analysis framework for performing interprocedural analysis of message-passing SPMD programs. The framework is based on the MPI-ICFG representation, which is an interprocedural control-flow graph augmented with communication edges between possible send and receive pairs and context-sensitivity. We demonstrate our techniques on the nonseparable analysis, activity analysis. Activity analysis is a domain-specific analysis used to reduce the computation and storage requirements for automatically differentiated MPI programs. Our experimental results have shown that using the MPI-ICFG data-flow analysis framework improves the precision of activity analysis and as a result significantly reduces memory requirements for the automatically differentiated versions of a set of parallel benchmarks.


 

Please send questions or suggestions to Debojyoti Ghosh: ghosh at mcs dot anl dot gov.