Table 2.

OpenMP Multithreading Speedup

Threads	Speedup	% Ideal
serial	1.0×	100
1	0.9×	88
2	1.5×	75
4	3.0×	74
8	5.8×	72
16	11.3×	71
32	22.3×	70

The speedup using OpenMP threads was calculated for 1 to 32 threads on a 3.3 GHz POWER7 p755 32-core server. A reference speed was calculated using mpAD4 compiled without OpenMP (serial). The numbers are scaled to a single serial docking run with the default benchmark parameters with modifications: ga_runs = 128, ga_num_evals = 5,000,000.