Evaluating Performance of OpenMP and MPI on the SGI Origin 2000 With Benchmarks of Realistic Problem Sizes
Final rept. Oct 1998-Sep 1999
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
Pagination or Media Count:
Six application benchmarks, including four numerical aerodynamic simulation NAS codes, provided by H. Jin and J. Wu, were previously parallelized using OpenMP and message-passing interface MPI and run on a 128-processor Silicon Graphics Inc. SGI Origin 2000. Detailed profile data were collected to understand the factors causing imperfect scalability. The results show that load imbalance and cost of remote accesses are the main factors in limited speedup of the OpenMP versions, whereas communication costs are the single major factor in the performance of the MPI versions.
- Computer Programming and Software
- Computer Systems