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@李东岳 NPC++没有提ldu结构,ldu结构reorder不减少matrix-vector product的操作次数。所以加速只可能来源于两点:更高的cache命中率(同样数量的操作,更快的执行速度)和更高的迭代效率(比如GS迭代,或许reorder之后的GS迭代矩阵的谱半径更小)。
对于纯粹的Krylov型求解器应该只有第一点。