[petsc-users] An issue about two parameter options in PETSc/GAMG

[赵刚]

Dear Mark and PETSc team,

I have a question when using PETSc/GAMG. For the parameter options `-pc_gamg_process_eq_limit <a>` and `-pc_gamg_coarse_eq_limit <b>`, when or for what kind of problems can it bring significant performance improvement? 
In addition, generally, what relationship do the `a`, `b` and number of processes need to meet? 
If there are some papers or numerical examples that show the performance advantages and importance of using the both parameters, could you provide it to me? Thanks a lot.


Best Regards,
Gang Zhao


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