PetscSplitOwnershipBlock#

Given a global (or local) length determines a local (or global) length via a simple formula. Splits so each processors local size is divisible by the block size.

Synopsis#

#include "petscsys.h" 
PetscErrorCode PetscSplitOwnershipBlock(MPI_Comm comm, PetscInt bs, PetscInt *n, PetscInt *N)

Collective (if N is PETSC_DECIDE)

Input Parameters#

  • comm - MPI communicator that shares the object being divided

  • bs - block size

  • n - local length (or PETSC_DECIDE to have it set)

  • N - global length (or PETSC_DECIDE)

Notes#

n and N cannot be both PETSC_DECIDE

If one processor calls this with N of PETSC_DECIDE then all processors must, otherwise the program will hang.

See Also#

PetscSplitOwnership(), PetscSplitOwnershipEqual()

Level#

developer

Location#

src/sys/utils/psplit.c

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