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TableĀ 8 Number of iterations and solution time in seconds of \(\pmb{\operatorname{PGMRES}(l)}\) iteration method with preconditioner \(\pmb{\mathcal{P}_{1}}\) and \(\pmb{\operatorname{GMRES}(l)}\) iteration method

From: On block diagonal-Schur complements of the block strictly doubly diagonally dominant matrices

l 30 40 50 60 70 80 90
PGMRES(l) CPU 0.0021 0.0026 0.0016 0.0016 0.0033 0.0021 0.0016
IT 4 4 4 4 4 4 4
GMRES(l) CPU 0.0096 0.0159 0.0197 0.0141 0.0196 0.0186 0.0176
IT 27 25 24 53 53 53 53