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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
	DIAG	SSOR	m = 3	m = 5	m = 7	m = 10	m = 3	m = 5	m = 7	m = 10	BFGS
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

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

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