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Table 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