Large-Scale Modeling of Epileptic Seizures: Scaling Properties of Two Parallel Neuronal Network Simulation Algorithms

Table 3

Estimated values for weak scaling problem for Verdandi (first block) and pNeo (second block).

Network size	Closest actual MPI pool from simulation	Estimated size of MPI pool	Expected computation Time (s)
Verdandi
2.6 K	4	4	0.94 K
32 K	36	49	2.2 K
94 K	81	144	6.2 K
380 K	256	576	6.6 K
pNeo
8.8 K	4	4	1.8 K
35 K	16	16	2.6 K
98 K	36	45	4.1 K
390 K	81	178	6.8 K

“Closest actual simulation” is an MPI pool that was actually run for that network size. “Estimated size of MPI pool” is the number of processes necessary to keep the ratio of number of cells/number of processors constant. The estimate time is computed assuming the observed scaling laws either with interpolation (up to 94 K for Verdandi, and up to 98 K for pNeo) or with extrapolation on a straight line (the larger network).