Determines if all processors in a communicator share a working directory or have different ones.
PetscErrorCode PetscSharedWorkingDirectory(MPI_Comm comm,PetscBool *shared)
comm -MPI_Communicator that may share working directory
shared -PETSC_TRUE or PETSC_FALSE
Options Database Keys
|-shared_working_directory||- - -not_shared_working_directory
|PETSC_SHARED_WORKING_DIRECTORY||- . PETSC_NOT_SHARED_WORKING_DIRECTORY
Stores the status as a MPI attribute so it does not have
to be redetermined each time.
Assumes that all processors in a communicator either
1) have a common working directory or
2) each has a separate working directory
eventually we can write a fancier one that determines which processors
share a common working directory.
This will be very slow on runs with a large number of processors since
it requires O(p*p) file opens.
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