PETSc version 3.17.5

PetscSharedWorkingDirectory

Determines if all processors in a communicator share a working directory or have different ones.

PetscErrorCode PetscSharedWorkingDirectory(MPI_Comm comm, PetscBool *shared)

Collective

comm

- MPI_Communicator that may share working directory

shared

- PETSC_TRUE or PETSC_FALSE

	-shared_working_directory	- indicates the directory is shared among the MPI ranks
	-not_shared_working_directory	- indicates the directory is shared among the MPI ranks

	PETSC_SHARED_WORKING_DIRECTORY	- indicates the directory is shared among the MPI ranks
	PETSC_NOT_SHARED_WORKING_DIRECTORY	- indicates the directory is shared among the MPI ranks

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.

developer