Computational resources for computing kernels. The computational time (upper) and memory usage (lower) for computing kernels of stoichiometric matrices using SVD and GJE algorithms for curated genome-scale networks. The system names correspond to those from Table 1. The squares correspond to SVD while circles to GJE. Numbers in upper legend denote the number of duplicated versions of the same network (see Results). Note that the computational time increases with increasing network size and the growth rate is roughly the same for both methods. However, SVD memory usage increases at twice the rate of GJE memory usage.