Table 7 Numbers of GCR iterations to convergence on ill-posed problems
From: Newton–Raphson preconditioner for Krylov type solvers on GPU devices
DIAG | SSOR | BFGS–DIAG | BFGS–SSOR | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
m = 3 | m = 5 | m = 7 | m = 10 | m = 3 | m = 5 | m = 7 | m = 10 | |||
\(40 \times 40 \times 125\) | 3930 | 341 | 878 | 900 | 964 | 891 | 165 | 210 | 248 | 267 |
\(20 \times 20 \times 500\) | NA | 1817 | 7709 | 4994 | 7690 | NA | 1188 | 1187 | 926 | 1256 |
\(10 \times 10 \times 2000\) | NA | 25,209 | NA | NA | NA | NA | 8736 | 9954 | 7088 | NA |