Fig. 8.

Computation times in milliseconds for (a) GPU and (c) CPU field predictions using 2-D arrays ranging from 1 to 20² pistons and varying numbers of field points. Increasing field points and number of pistons results in increasing computation times. In the case of a 20² piston array, a 256³-point field volume is calculated within 713 ms on the GPU, 67 717 ms on the CPU, thus 95× faster on the GPU. Corresponding computation times in nanoseconds per piston per field point for (b) GPU and (d) CPU. In the case of a 256³-point field volume generated for a 20²-piston array, the execution time per field point per piston is within 0.11 ns on the GPU and 10.1 ns on the CPU. The efficiency of GPU computations improves with increasing numbers of field points and pistons, whereas the efficiency of CPU calculations improves primarily with increasing numbers of pistons. All times are averaged over 10 runs; standard deviations are negligible and omitted for clarity.