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Table 2 Numbers of GCR iterations to convergence

From: Newton–Raphson preconditioner for Krylov type solvers on GPU devices

  DIAG SSOR BFGS–DIAG BFGS–SSOR BFGS
m = 3 m = 5 m = 7 m = 10 m = 3 m = 5 m = 7 m = 10
GR_30_30 224 55 155 120 157 169 47 50 50 50 65
BCSSTK14 2422 NA 1554 1447 1415 1668 439 535 526 584 584
BCSSTK15 NA NA 5448 7161 5856 NA 1599 1474 2396 NA 788
RDB450 NA NA 113,940 111,350 86,928 NA 15,066 19,880 19,960 26,308 NA
  1. NA denotes the preconditioned GCR doesn’t converge within 150,000 iterations, and m denotes the number of previous iterations to be taken into consideration