PetscSharedTmp

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

Synopsis

PetscErrorCode PetscSharedTmp(MPI_Comm comm, PetscBool *shared)

Collective

Input Parameter

• comm - MPI_Communicator that may share tmp

Output Parameter

• shared - PETSC_TRUE or PETSC_FALSE

Options Database Keys

• -shared_tmp - indicates the directory is known to be shared among the MPI processes

• -not_shared_tmp - indicates the directory is known to be not shared among the MPI processes

• -tmp tmpdir - name of the directory you wish to use as tmp

Environmental Variables

• PETSC_SHARED_TMP - indicates the directory is known to be shared among the MPI processes

• PETSC_NOT_SHARED_TMP - indicates the directory is known to be not shared among the MPI processes

• PETSC_TMP - name of the directory you wish to use as tmp

Notes

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 tmp or

2. each has a separate tmp eventually we can write a fancier one that determines which processors share a common tmp.

This will be very slow on runs with a large number of processors since it requires O(p*p) file opens.

If the environmental variable PETSC_TMP is set it will use this directory as the “tmp” directory.

See Also

PetscGetTmp(), PetscSharedWorkingDirectory(), PetscGetWorkingDirectory(), PetscGetHomeDirectory()

Level

developer

Location

src/sys/fileio/fretrieve.c

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