Table 2: Iteration information of the GMRES(m) solver with m=50 and various settings of $\varepsilon $ ( $\varepsilon _1=10^{-16}$, $\varepsilon _2=10^{-6}$, $\varepsilon _3=10^{-2}$).
DOF (N) GMRES( $50,\varepsilon_1$) GMRES( $50,\varepsilon_2$) GMRES( $50,\varepsilon_3$)
1023 (129, 134, 137) (35, 41, 42) (6, 11, 11)
1443 (140, 145, 148) (38, 43, 45) (6, 11, 11)
1935 (149, 151, 173) (40, 45, 47) (6, 11, 11)
2499 (172, 175, 176) (42, 47, 49) (6, 11, 11)
3135 (178, 183, 182) (43, 50, 53) (5, 11, 11)
3843 (186, 194, 194) (45, 51, 59) (5, 11, 11)
4623 (193, 200, 201) (46, 56, 61) (5, 11, 11)
5475 (200, 228, 230) (47, 59, 63) (5, 11, 11)
6399 (204, 230, 233) (48, 60, 65) (5, 11, 11)
7395 (230, 236, 238) (49, 64, 67) (5, 11, 11)


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