mpihelper.hh File Reference
Detailed Description
This file contains helpers for dealing with MPI.Basically there are two helpers available:.
- FakeMPIHelper
- A class adhering to the interface of MPIHelper that does not need MPI at all. This can be used to create a sequential program even if MPI is used to compile it.
- MPIHelper
- A real MPI helper. When the singleton gets instantiated MPI_Init will be called and before the program exits MPI_Finalize will be called.
Example of who to use these classes:
A program that is parallel if compiled with MPI and sequential otherwise:
int main(int argc, char** argv){ typedef Dune::MPIHelper MPIHelper; MPIHelper::instance(&argc, &argv); typename MPIHelper::MPICommunicator world = MPIHelper::getCommunicator(); ...
If one wants to have sequential program even if the code is compiled with mpi then one simply has to exchange the typedef with
typedef Dune::MPIHelper FakeMPIHelper;
For checking whether we really use MPI or just fake please use MPIHelper::isFake (this is also possible at compile time!)
#include <cassert>
#include "mpi.h"
#include "stdstreams.hh"
Go to the source code of this file.
Namespaces | |
namespace | Dune |
Classes | |
class | Dune::FakeMPIHelper |
A fake mpi helper. More... | |
class | Dune::MPIHelper |
A real mpi helper.
This helper should be used for parallel programs. More... |