A Combined MPI-CUDA Parallel Solution of Linear and Nonlinear Poisson-Boltzmann Equation

Table 1

Neighbor offsets for even and odd points.

Neighbor	Offset when 𝑝𝑜 is even	Offset when 𝑝𝑜 is odd
Left (−𝑋)	−1	+1
Right (+𝑋)	0	0
Back (−𝑌)	−(𝑛𝑥+1)2	−(𝑛𝑥−1)2
Front (+𝑌)	+(𝑛𝑥−1)2	+(𝑛𝑥+1)2
Bottom (−𝑍)	−(𝑛𝑥𝑛𝑦+1)2	−(𝑛𝑥𝑛𝑦−1)2
Top (+𝑍)	+(𝑛𝑥𝑛𝑦−1)2	+(𝑛𝑥𝑛𝑦+1)2