PETSC_COMM_WORLD#
the equivalent of the MPI_COMM_WORLD communicator which represents all the processes that PETSc knows about.
Notes#
By default PETSC_COMM_WORLD and MPI_COMM_WORLD are identical unless you wish to
run PETSc on ONLY a subset of MPI_COMM_WORLD. In that case create your new (smaller)
communicator, call it, say comm, and set PETSC_COMM_WORLD = comm BEFORE calling
PetscInitialize(), but after MPI_Init() has been called.
The value of PETSC_COMM_WORLD should never be USED/accessed before PetscInitialize()
is called because it may not have a valid value yet.
See Also#
Level#
beginner
Location#
Examples#
src/dm/dt/dualspace/impls/lagrange/tutorials/ex1.c
src/dm/dt/dualspace/impls/lagrange/tutorials/ex2.c
src/dm/field/tutorials/ex1.c
src/dm/impls/forest/tutorials/ex1.c
src/dm/impls/plex/tutorials/ex1.c
src/dm/impls/plex/tutorials/ex10.c
src/dm/impls/plex/tutorials/ex11.c
src/dm/impls/plex/tutorials/ex13.c
src/dm/impls/plex/tutorials/ex14.c
src/dm/impls/plex/tutorials/ex1f90.F90
src/dm/impls/plex/tutorials/ex3f90.F90
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages