petsc-3.11.4 2019-09-28
DMLocalToGlobal
updates global vectors from local vectors
Synopsis
#include "petscdm.h"
#include "petscdmlabel.h"
#include "petscds.h"
PetscErrorCode DMLocalToGlobal(DM dm,Vec l,InsertMode mode,Vec g)
Neighbor-wise Collective on DM
Input Parameters
| dm | - the DM object
|
| l | - the local vector
|
| mode | - if INSERT_VALUES then no parallel communication is used, if ADD_VALUES then all ghost points from the same base point accumulate into that base point.
|
| g | - the global vector
|
Notes
The communication involved in this update can be overlapped with computation by using
DMLocalToGlobalBegin() and DMLocalToGlobalEnd().
In the ADD_VALUES case you normally would zero the receiving vector before beginning this operation.
INSERT_VALUES is not supported for DMDA; in that case simply compute the values directly into a global vector instead of a local one.
See Also
DMLocalToGlobalBegin(), DMLocalToGlobalEnd(), DMCoarsen(), DMDestroy(), DMView(), DMCreateGlobalVector(), DMCreateInterpolation(), DMGlobalToLocal(), DMGlobalToLocalEnd(), DMGlobalToLocalBegin()
Level
beginner
Location
src/dm/interface/dm.c
Examples
src/dm/impls/stag/examples/tutorials/ex1.c.html
src/dm/impls/stag/examples/tutorials/ex2.c.html
src/dm/impls/stag/examples/tutorials/ex3.c.html
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages