Dune Core Modules (2.4.1)
mpihelper.hh File Reference
Helpers for dealing with MPI. More...
#include <cassert>
#include "collectivecommunication.hh"
#include "mpi.h"
#include "mpicollectivecommunication.hh"
#include <dune/common/stdstreams.hh>
#include <dune/common/visibility.hh>
Go to the source code of this file.
Classes | |
class | Dune::FakeMPIHelper |
A fake mpi helper. More... | |
class | Dune::MPIHelper |
A real mpi helper. More... | |
Namespaces | |
namespace | Dune |
Dune namespace. | |
Detailed Description
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!)
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