Open AccessA study of application sensitivity to variation in message passing latency and bandwidth
Author(s) -
P.H. Worley,
David R. Mackay,
Allen C. Robinson,
E. Barragy
Publication year - 1996
Language(s) - English
Resource type - Reports
DOI - 10.2172/279676
Subject(s) - oak ridge national laboratory , message passing , computer science , code (set theory) , latency (audio) , benchmark (surveying) , interconnection , parallel computing , bandwidth (computing) , physics , telecommunications , programming language , geography , set (abstract data type) , geodesy , nuclear physics
This study measures the effects of changes in message latency and bandwidth for production-level codes on a current generation tightly coupled MPP, the Intel Paragon. Messages are sent multiple times to study the application sensitivity to variations in band - width and latency. This method preserves the effects of contention on the interconnection network. Two applications are studied, PCTH, a shock physics code developed at Sandia National Laboratories, and PSTSWM, a spectral shallow water code developed at Oak Ridge National Laboratory and Argonne National Laboratory. These codes are significant in that PCTH is a {open_quote}full physics{close_quotes} application code in production use, while PSTSWM serves as a parallel algorithm test bed and benchmark for production codes used in atmospheric modeling. They are also significant in that the message-passing behavior differs significantly between the two codes, each representing an important class of scientific message-passing applications