Size of A

1024 ´ 1024

4096 ´ 4096

Method

Its

Time

RE

Its

Time

RE

DQMR

155

0.61

5.9674e−09

267

7.39

8.8234e−09

DGMRES

165

0.88

3.0294e−09

307

10.89

8.1578e−09