[petsc-users] SLEPc - control of MUMPS in Fortran

[Appel, Thibaut]

Good afternoon,

I am using SLEPc in shift-and-invert mode to solve linear generalized EVPs. I am also using MUMPS for solving the linear systems that stem from the problem. After browsing a lot of pages, I am quite surprised by the lack of documentation available regarding the MUMPS interface with SLEPc/PETSc.

- I would like, in my code, to set and print MUMPS control and output parameters (CNTL,ICNTL,INFO) to monitor the process but it seems like a tedious task in Fortran. I found this discussion https://lists.mcs.anl.gov/pipermail/petsc-users/2012-May/013437.html that suggests hard-coded statements in c++ to set MUMPS parameters. Is there a clean solution in Fortran?

- When using MUMPS together with SLEPc, can you perform iterative refinement? I tried to set ICNTL(10) to do so but nothing happens. Can I trust SLEPc for automatically setting MUMPS parameters that will ensure best scalability? If you have further advice for using optimally SLEPc together with MUMPS I would really appreciate it and enjoy discussing it with you.

Thank you in advance,


Thibaut
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