PETSc topics

Experimental html version of downloadable textbook, see http://www.tacc.utexas.edu/~eijkhout/istc/istc.html
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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 .

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