Figure 10.

Speedup of DFSP over ISSA and both MSA stencils (subscript 1 denotes the case where net diffusion is solved for adjacent voxels, and 2 the case where net diffusion is solved for the two nearest neighbors on either side) for varying values of τ_D for the G-protein cycle example. DFSP presents significant performance increases over ISSA and both MSA stencils for reaction-diffusion simulation. The speedup is due in part to the number of times the reaction propensity function needs to be updated due to diffusive transfers. DFSP updates less often than ISSA or MSA. As τ_D increases, the number of updates decreases and performance increases.