Dune::MPIHelper Class Reference

A real mpi helper. More...

#include <dune/common/parallel/mpihelper.hh>

Public Types
typedef MPI_Comm	MPICommunicator
	The type of the mpi communicator.

Public Member Functions
int	rank () const
	return rank of process
int	size () const
	return number of processes
	~MPIHelper ()
	calls MPI_Finalize

Static Public Member Functions
static MPICommunicator	getCommunicator ()
	get the default communicator More...
static MPICommunicator	getLocalCommunicator ()
	get a local communicator More...
static DUNE_EXPORT MPIHelper &	instance (int &argc, char **&argv)
	Get the singleton instance of the helper. More...

Static Public Attributes
static constexpr bool	isFake = false
	Are we fake (i. e. pretend to have MPI support but are compiled without.

Related Functions
(Note that these are not member functions.)
static DUNE_EXPORT MPIHelper &	instance (int *argc=nullptr, char ***argv=nullptr)
	Get the singleton instance of the helper. More...

Detailed Description

A real mpi helper.

This helper should be used for parallel programs.

Examples

recipe-integration.cc, and recipe-iterate-over-grid.cc.

Member Function Documentation

getCommunicator()

static MPICommunicator Dune::MPIHelper::getCommunicator ( )

inlinestatic

get the default communicator

Return a communicator to exchange data with all processes

Returns

MPI_COMM_WORLD

getLocalCommunicator()

static MPICommunicator Dune::MPIHelper::getLocalCommunicator ( )

inlinestatic

get a local communicator

Returns a communicator to exchange data with the local process only

Returns

MPI_COMM_SELF

Referenced by Dune::GridFactoryInterface< GridType >::comm().

instance()

static DUNE_EXPORT MPIHelper & Dune::MPIHelper::instance ( int &  argc, char **&  argv  )

inlinestatic

Get the singleton instance of the helper.

This method has to be called with the same arguments that the main method of the program was called:

int main(int argc, char** argv){
  MPIHelper::instance(argc, argv);
  // program code comes here
  ...
}

The MPIHelper will be globally initialized on its first call. Afterwards, all arguments to this function will be ignored.

Parameters

argc	The number of arguments provided to main.
argv	The arguments provided to main.

Examples

recipe-integration.cc, and recipe-iterate-over-grid.cc.

References instance().

Referenced by instance().

Friends And Related Function Documentation

instance()

static DUNE_EXPORT MPIHelper & instance ( int *  argc = nullptr, char ***  argv = nullptr  )

related

Get the singleton instance of the helper.

This method can be called either without any arguments, or with the same arguments that the main method of the program was called, passed as pointer:

int main(int argc, char** argv){
  MPIHelper::instance();
  // or: MPIHelper::instance(&argc, &argv);
  // program code comes here
  ...
}

The MPIHelper will be globally initialized on its first call. Afterwards, all arguments to this function will be ignored.

Note

This overload accepts all arguments by pointer similar to the MPI_Init function and allows to pass nullptr for all arguments.

(int&, char**&)

Parameters

argc	The number of arguments provided to main.
argv	The arguments provided to main.

References instance().

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The documentation for this class was generated from the following file:

• dune/common/parallel/mpihelper.hh