\[ \newcommand\inv{^{-1}}\newcommand\invt{^{-t}} \newcommand\bbP{\mathbb{P}} \newcommand\bbR{\mathbb{R}} \newcommand\defined{ \mathrel{\lower 5pt \hbox{${\equiv\atop\mathrm{\scriptstyle D}}$}}} \] 39.1 : Communicators
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39 PETSc topics

39.1 Communicators

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PETSc has a `world' communicator, which by default equals MPI_COMM_WORLD  . If you want to run PETSc on a subset of processes, you can assign a subcommunicator to the variable PETSC_COMM_WORLD in between the calls to MPI_Init and PetscInitialize  . Petsc communicators are of type PetscComm  .