PCG convergence history 100 105 2装5393oc00909e0909903e0ee3030e0ne9e09e60406e为 10-10 CG SGS 1015 -TriDiag ichol -michol 10-20 10 20 30 40 50 60 70 80 90 100 Performance of different preconditioners for 2D Poisson with n=642 http:/aath.ecn.edu.cm/jp 7/72 10 20 30 40 50 60 70 80 90 100 10-20 10-15 10-10 10-5 100 PCG convergence history CG SGS TriDiag ichol michol Performance of different preconditioners for 2D Poisson with n = 642 http://math.ecnu.edu.cn/~jypan 7/72