SC Conference - Activity Details

Performance of Electronic Structure Calculations on Blue Gene and Cray XT4 Computers.

Andrey Asadchev  (Iowa State University)
Mark Gordon  (Iowa State University)
Brett Bode  (Ames Laboratory)
Posters Session
Tuesday,  05:15PM - 07:00PM
Room Rotunda Lobby
The performance of the General Atomic and Molecular Electronic Structure System (GAMESS) on Cray XT4 and IBM Blue Gene (BG) supercomputers is presented. Efficient utilization of massively parallel computers enables the results of large self consistent field (SCF) and econd order perturbation theory (MP2) calculations to be obtained in a short time. A number of performance limiting steps, including serial N^3 steps in the orbital guess, SCF iterations, and property evaluations have been parallelized and optimized. Poor SCF cache performance has been addressed with moderate to significant improvements. Results of parallel N^3 implementation on BG/L and XT4 systems, as well as on x86 clusters, are discussed. MP2 performance on BG/L and XT4 is compared and special considerations when running on BG/L are discussed. The improvements and discussions should be of interest to those considering using GAMESS on these supercomputers.
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