Analysis of a New MPI Process Distribution for the Weather Research and Forecasting (WRF) Model

Table 1

Average wall time when using n processing nodes and 8 processor cores with different domain distributions.

9 × 1	3443	16 × 1	2596	25 × 1	2117	36 × 1	—
3 × 3	2403	8 × 2	1714	5 × 5	1017	18 × 2	1152
1 × 9	2327	4 × 4	1458	1 × 25	1298	12 × 3	951
		2 × 8	1396			9 × 4	861
		1 × 16	1622			6 × 6	824
						4 × 9	801
						3 × 12	855
						2 × 18	908
						1 × 36	—

The automatic distributions chosen by WRF are underlined and the ones with the best are marked in bold. Some extreme distributions such as crashed the simulations and could not be executed.