Basic HTML version of Foils prepared 17 November 1998

Foil 108 Latency Measurements on Origin and Sun for MPI

From Master Foilset for HPC Achitecture Overview CPS615 Basic Simulation Track for Computational Science -- Fall Semester 98. by Geoffrey C. Fox
NASA Ames Comparison of MPI on Origin 2000 and Sun E10000
Origin 2000: mpirun -np 2 ./lbw -L -n 2500000 -D
Total transfer time: 52.597 sec.
Transfer rate: 47531.4 transfers/sec.
Message size: 40 bytes
Latency: 10.5 microsec.
Sun E10000: tmrun -np 2 ./lbw -L -n 2500000 -D
Total transfer time: 34.585 sec.
Transfer rate: 72286.7 transfers/sec.
Message size: 40 bytes
Latency: 6.9 microsec.
Note: Origin CPU about twice performance of Sun CPU

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