GPU-Accelerated Finite Element Method for Modelling Light Transport in Diffuse Optical Tomography

Table 2

GPU run-time comparisons for FEM forward solver computations of 80 source distributions in cylindrical meshes of different node densities. Real-valued problems were solved with a conjugate gradient solver, complex problems with a biconjugate gradient stabilised solver. Values in parentheses are CPU solution times.

Node number	Runtime [s]
	Real single	Complex single	Real double	Complex double
8987	11.07	13.43	11.1	14.4
	(8.49)	(26.15)	(3.74)	(10.46)
82517	23.24	60.03	26.85	75.42
	(193.94)	(678.65)	(96.21)	(271.9)
245917	82.56	433.89	117.41	523.76
	(1789.7)	(12996.8)	(837.39)	(2351.25)
327617	127.19	1060.42	189.06	909.45
	(3258.46)	(−)	(1509.22)	(4699.71)