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. Author manuscript; available in PMC: 2012 Sep 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Sep;58(9):2001–2012. doi: 10.1109/TUFFC.2011.2044

Fig. 7.

Fig. 7

Computation times in milliseconds for (a) GPU and (c) CPU field predictions using 1-D arrays ranging from 1 to 512 pistons and varying numbers of field points. Increasing field points and number of pistons results in increasing computation times. In the case of a 512-piston array, a 2563-point field volume is calculated within 745 ms on the GPU, 165 533 ms on the CPU, thus 222× 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 512-piston array, the execution time per field point per piston is within 0.087 ns on the GPU and 19.3 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.