PCMPIServerBegin#

starts a server that runs on the rank != 0 MPI processes waiting to process requests for parallel KSP solves and management of parallel KSP objects.

Synopsis#

PetscErrorCode PCMPIServerBegin(void)

Logically Collective on all MPI ranks except 0

Options Database Keys#

-mpi_linear_solver_server - causes the PETSc program to start in MPI linear solver server mode where only the first MPI rank runs user code
-mpi_linear_solver_server_view - displays information about the linear systems solved by the MPI linear solver server

Note#

This is normally started automatically in PetscInitialize() when the option is provided

Developer Notes#

When called on rank zero this sets PETSC_COMM_WORLD to PETSC_COMM_SELF to allow a main program written with PETSC_COMM_WORLD to run correctly on the single rank while all the ranks (that would normally be sharing PETSC_COMM_WORLD) to run the solver server.

Can this be integrated into the PetscDevice abstraction that is currently being developed?