An Efficient Algorithm for EM Scattering from Anatomically Realistic Human Head Model Using Parallel CG-FFT Method

Table 3

Parallel efficiency.

Cells	Processes	Time (second)	Parallel efficiency
64×64×64	1	22.8	1
	2	12.38	0.92
	4	7.2	0.80
128×128×128	1	168.1	1
	2	90.4	0.93
	4	50.6	0.83
	8	31.8	0.66
256×256×512	1	2988.3	1
	2	1641.8	0.91
	4	940.1	0.79
	8	612.3	0.61
512×512×512	1	19409.2	1
	2	10904.6	0.89
	4	6469.7	0.75
	10	3289.7	0.59
	12	3171.4	0.51