PetscSubcommType

How a PetscSubcomm is constructed

Synopsis

typedef enum {
  PETSC_SUBCOMM_GENERAL    = 0,
  PETSC_SUBCOMM_CONTIGUOUS = 1,
  PETSC_SUBCOMM_INTERLACED = 2
} PetscSubcommType;

Values

• PETSC_SUBCOMM_GENERAL - similar to MPI_Comm_split() each process sets the new communicator (color) they will belong to and the order within that communicator

• PETSC_SUBCOMM_CONTIGUOUS - each new communicator contains a set of process with contiguous ranks in the original MPI communicator

• PETSC_SUBCOMM_INTERLACED - each new communicator contains a set of processes equally far apart in rank from the others in that new communicator

Example

Consider a communicator with six processes split into 3 subcommunicators.

   PETSC_SUBCOMM_CONTIGUOUS - the first communicator contains rank 0 and 1, the second rank 2 and 3, and the third rank 4 and 5 in the original ordering of the original communicator
   PETSC_SUBCOMM_INTERLACED - the first communicator contains rank 0 and 3, the second rank 1 and 4, and the third process 2 and 5

See Also

PetscSubcommCreate(), PetscSubcommSetNumber(), PetscSubcommSetType(), PetscSubcommView(), PetscSubcommSetFromOptions()

Level

advanced

Location

include/petscsystypes.h

Examples

src/ksp/ksp/tutorials/ex73.c

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