Benchmark Grid Gather Scatter performance
The plots below show performance of grid halo on the ORNL Frontier supercomputer. Both CPU and GPU performance are compared as a function of total grid points per rank (with eight MPI ranks).
Creation refers to construction of the Halo object (building the communication steering vectors) and gather and scatter refer to executing the communication (copying ghosted grid points on neighboring ranks). Each point represents a single integer halo width. The lowest, outlier lines represent the smallest halo width (=1).
Default parameters with the commandline "large" setting were used for these results.