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 or accessed before PetscInitialize()
is called because it may not have a valid value yet.
See Also#
Level#
beginner
Location#
Examples#
src/dm/tutorials/ex3.c
src/ts/utils/dmplexlandau/tutorials/ex2.c
src/dm/tutorials/swarm_ex1.c
src/dm/tutorials/ex22.c
src/dm/tutorials/ex20.c
src/dm/impls/stag/tutorials/ex8.c
src/dm/tutorials/ex21.c
src/dm/tutorials/ex10.c
src/dm/label/tutorials/ex1.c
src/dm/impls/stag/tutorials/ex4.c
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages