[petsc-users] Questions On CGS iteration refinement in GMRES

王一甲 wangyijia at lsec.cc.ac.cn
Thu Dec 3 03:19:37 CST 2020

To any one who it may concern:

Hi, my name is Wang Yijia from Chinese Academy of Science. Recently I've been working on  some sparse linear system baseline tests using PETSc. When using gmres methods in KSP, I found that the option -ksp_gmres_cgs_refinement refine_always worked well on my sparse linear system, however I can not find more about how this process is done in the Hessenberg matrix generation(classical Gram-Schmidt process). I am curious about how the cgs iteration refinement process work in the whole KSP solve stage. I would appreciate it if you could offer some help.

                                                                                                                                                                             Yours sincerely

                                                                                                                                                                               Wang Yijia


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