Dear all I used the reordering scheme in petsc, and I would like to know whether they are symmetric or not.
I have a symmetric matrix (for 3D system) and I tried to solve it with petsc and with matlab. In petsc I used rcm + ILU + bicgstab. while in matlab I used symrcm+ICC+bicgstab. it seems that with symmetric reordering, the factorization is somewhat faster... So I am wondering if it is possible to apply a symmetric reordering? PS: in Matlab, an incomplete factorization can be done with a tolerance (e.g. ICC(1e-4) ), can I do something like that with Petsc? Thanks a lot Best regards Zhifeng Sheng
