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. Author manuscript; available in PMC: 2010 Mar 3.

Published in final edited form as: Comput Methods Programs Biomed. 2002 Feb;67(2):115–124. doi: 10.1016/s0169-2607(01)00121-3

Table 1.

Measured timing results on the SP2 as a function of the number of processors and problem size

N	Small (8.4×10⁷ photons/projection)			Medium (8.4×10⁸ photons/projection)
	Time (s)	Speedup	Efficiency	Time (s)	Speedup	Efficiency
1	17131	1.000	1.000	171640	1.000	1.000
2	8581	1.997	0.998	85922	1.998	0.999
4	4298	3.986	0.996	42959	3.995	0.999
8	2162	7.923	0.990	21598	7.947	0.993
16	1085	15.785	0.987	10749	15.968	0.998
32	547	31.304	0.978	5408	31.739	0.992