petsc-3.7.7 2017-09-25
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Get a window for use with a given data type


#include "petscsf.h" 
static PetscErrorCode PetscSFGetWindow(PetscSF sf,MPI_Datatype unit,void *array,PetscBool epoch,PetscMPIInt fenceassert,PetscMPIInt postassert,PetscMPIInt startassert,MPI_Win *win)
Collective on PetscSF

Input Arguments

sf - star forest
unit - data type
array - array to be sent
epoch - PETSC_TRUE to acquire the window and start an epoch, PETSC_FALSE to just acquire the window
fenceassert - assert parameter for call to MPI_Win_fence(), if PETSCSF_WINDOW_SYNC_FENCE
postassert - assert parameter for call to MPI_Win_post(), if PETSCSF_WINDOW_SYNC_ACTIVE
startassert - assert parameter for call to MPI_Win_start(), if PETSCSF_WINDOW_SYNC_ACTIVE

Output Arguments

win -window

Developer Notes

This currently always creates a new window. This is more synchronous than necessary. An alternative is to try to reuse an existing window created with the same array. Another alternative is to maintain a cache of windows and reuse whichever one is available, by copying the array into it if necessary.

See Also

PetscSFGetRanks(), PetscSFWindowGetDataTypes()

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