PetscSFGetRootRanks

Get the root MPI ranks and number of vertices referenced by leaves on this process

Synopsis

#include "petscsf.h" 
PetscErrorCode PetscSFGetRootRanks(PetscSF sf, PetscMPIInt *nranks, const PetscMPIInt *ranks[], const PetscInt *roffset[], const PetscInt *rmine[], const PetscInt *rremote[])

Not Collective

Input Parameter

• sf - star forest

Output Parameters

• nranks - number of MPI processes referenced by local part

• ranks - [nranks] array of MPI ranks

• roffset - [nranks+1] offset in rmine and rremote for each MPI process

• rmine - [roffset[nranks]] concatenated array holding local indices referencing each remote MPI process, or NULL

• rremote - [roffset[nranks]] concatenated array holding remote indices referenced for each remote MPI process, or NULL

See Also

PetscSF - an alternative to low-level MPI calls for data communication, PetscSF, PetscSFGetLeafRanks()

Level

developer

Location

src/vec/is/sf/interface/sf.c

Examples

src/vec/is/sf/tutorials/ex1.c
src/vec/is/sf/tutorials/ex1f.F90

Implementations

PetscSFGetRootRanks_Allgatherv() in src/vec/is/sf/impls/basic/allgatherv/sfallgatherv.c

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Index of all PetscSF routines
Table of Contents for all manual pages
Index of all manual pages