Qualitative Simulation of Photon Transport in Free Space Based on Monte Carlo Method and Its Parallel Implementation

Table 2

Performance comparison between parallel framework with different number of CPUs and serial framework. Speed-up Ratio is defined as the ratio between the time cost of multi-CPUs simulation and that of single CPU simulation. Relative error is defined as |Experiment value−Theoretical value|/ Theoretical value.

CPU number	Time Cost (s)	Speed-up Ratio		Relative error
		Experiment value	Theoretical value
1	71173.4	1.00000	1.00000	0.00000
2	37898.9	1.87798	2.00000	0.06101
4	20200.9	3.52328	4.00000	0.11918
6	13526.8	5.26166	6.00000	0.12306
8	9802.32	7.26087	8.00000	0.09239
10	8271.94	8.60420	10.00000	0.13958
12	6926.80	10.2751	12.00000	0.14374
14	5758.62	12.3595	14.00000	0.11718
16	5199.02	13.6898	16.00000	0.14439