VecView and MPI IO

[Shao-Ching Huang]

Hi,

I am trying to create restart/check-pointing files for a time-stepping
simulation (by writing out vectors to files).

1. Does VecView always use the MPI collective I/O?

    The HTML documentation of PetscViewerBinaryOpen says: "For writing
    files it only opens the file on processor 0 in the communicator."

2. Do I have to set anything to enable MPI I/O when configuring PETSc?
    (My MPI library has MPI I/O.)

Thank you.

Shao-Ching