PetscSFFetchAndOpEnd#

end operation started in matching call to PetscSFFetchAndOpBegin() or PetscSFFetchAndOpWithMemTypeBegin() to fetch values from roots and update atomically by applying operation using my leaf value

Synopsis#

#include "petscsf.h" 
PetscErrorCode PetscSFFetchAndOpEnd(PetscSF sf, MPI_Datatype unit, void *rootdata, const void *leafdata, void *leafupdate, MPI_Op op)

Collective

Input Parameters#

  • sf - star forest

  • unit - data type

  • leafdata - leaf values to use in reduction

  • op - operation to use for reduction

Output Parameters#

  • rootdata - root values to be updated, input state is seen by first process to perform an update

  • leafupdate - state at each leaf’s respective root immediately prior to my atomic update

See Also#

PetscSF, PetscSFComputeDegreeEnd(), PetscSFReduceEnd(), PetscSFSetGraph(), PetscSFFetchAndOpBegin(), PetscSFFetchAndOpWithMemTypeBegin()

Level#

advanced

Location#

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

Examples#

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

Implementations#

PetscSFFetchAndOpEnd_Allgatherv in src/vec/is/sf/impls/basic/allgatherv/sfallgatherv.c
PetscSFFetchAndOpEnd_Neighbor in src/vec/is/sf/impls/basic/neighbor/sfneighbor.c
PetscSFFetchAndOpEnd_Basic in src/vec/is/sf/impls/basic/sfbasic.c
PetscSFFetchAndOpEnd_Window in src/vec/is/sf/impls/window/sfwindow.c

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