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TableĀ 4 Number of iterations and solution time in seconds of \(\pmb{\operatorname{PGMRES}(l)}\) iteration method with preconditioner \(\pmb{\mathcal{P}_{1}}\) and the ordinary \(\pmb{\operatorname{GMRES}(l)}\) iteration method, where \(\pmb{\alpha=\{1, 2\}}\)

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 0.0106 0.0015 0.0024 0.0018 0.0014 0.0024 0.0015
IT 4 4 4 4 4 4 4
GMRES(l) CPU 0.0046 0.0054 0.0042 0.0018 0.0042 0.0156 0.0048
IT 23 23 23 23 23 23 23