Parallel implementation of compact numerical schemes
Tsukasa Fujita*, R. James Purser
NOAA/NWS/NCEP/EMC, *Visiting scientist from JMA
Abstract:
Compact numerical shcemes for high-order spatial differencing and
integration are planned to be incorporated into a non-hydrostatic
semi-Lagrangian dynamical core under development as part of the
multi-institution Weather Research and Forecasting (WRF) project. Since
the schemes require recursive operations along entire lines of one
dimension, they should be implemented with algorithms carefully devised
not to impair their performance seriously. We tested three methods which
feature different parallelization strategies for the recursive
components, all of which are intended to be computationally efficient.
The three methods differ significantly in their handling of
communication. We describe these implementations, their motivations and
limitations, and their actual computational performance over domains of
various sizes.