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/petsc/src/mat/impls/aij/mpi/
H A Dmpiov.c3008 PetscInt cismax, ispar; in MatCreateSubMatricesMPI_MPIXAIJ() local
3027 …PetscCallMPI(MPIU_Allreduce(&cismax, &ispar, 1, MPIU_INT, MPI_MAX, PetscObjectComm((PetscObject)C)… in MatCreateSubMatricesMPI_MPIXAIJ()
3028 …if (!ispar) { /* Sequential ISs only across C's comm, so can call the sequential matrix extraction… in MatCreateSubMatricesMPI_MPIXAIJ()