Fig. 1.
Weak scaling test. Each MPI process treats 15002 cells. We tested different preconditioners: Jacobi with damping (Relaxation), AMG, standard ILU(k) factorization (RILUK), a variant of the standard ILU factorization (ILUT), and additive Schwarz domain decomposition (Schwarz). Left panel: number of iterations to solve the linear system as a function of the number of cells. Right panel: speed-up as a function of the number of MPI processes.
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