[petsc-dev] PETSc communicators with MPI in Fortran

[Neelam Patel]

Hello PETSc users,
Working in Fortran, I created 2 disjoint communicators with MPI_Group operations using PETSC_COMM_WORLD as the "base" comm. I created parallel vectors on each communicator, and set values in them equal to their ranks on PETSC_COMM_WORLD. Everything seems to be working fine. My question is: Is this a valid thing to do? Or will it cause some undefined behaviour that I'm not seeing right now?
I somehow thought that communicators created this way were not 'visible' to PETSc. Or is it that using PETSC_COMM_WORLD above eliminates that problem?
Thank you in advance,Neelam
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