Multitasking Domain Decompositon Fast Poisson Solvers on the Cray Y-MP

摘要

We present the results of multitasking implementation of a domain decomposition fast Poisson solver on eight processors of the Cray Y-MP. The object of this research is to study the performance of domain decomposition methods on a Cray supercomputer and to analyze the performance of different multitasking techniques using highly parallel algorithms. Two implementations of multitasking are considered: macrotasking (parallelism at the subroutine level) and microtasking (parallelism at the do-loop level). A conventional FFT-based fast Poisson solver is also multitasked. The results of different implementations are compared and analyzed. A speedup of over 7.4 on the Cray Y-MP running in a dedicated environment is achieved for all cases.