Teuchos::GlobalMPISession Class Reference

This class provides methods for initializing, finalizing, and querying the global MPI session. More...

#include <Teuchos_GlobalMPISession.hpp>

List of all members.

Public Member Functions
Public constructor and destructor
	GlobalMPISession (int *argc, char ***argv, std::ostream *out=&std::cout)
	Calls MPI_Init() if MPI is enabled.
	~GlobalMPISession ()
	Calls MPI_Finalize() if MPI is enabled.
Static Public Member Functions
Static functions
static bool	mpiIsInitialized ()
static bool	mpiIsFinalized ()
static int	getRank ()
	Returns the process rank relative to MPI_COMM_WORLD
static int	getNProc ()
	Returns the number of processors relative to MPI_COMM_WORLD

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Detailed Description

This class provides methods for initializing, finalizing, and querying the global MPI session.

This class is primarilly designed to insulate basic main() program type of code from having to know if MPI is enabled or not.

ToDo: Give examples!

Examples:

CommandLineProcessor/cxx_main.cpp, and FancyOutputting_test.cpp.

Definition at line 52 of file Teuchos_GlobalMPISession.hpp.

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Constructor & Destructor Documentation

Teuchos::GlobalMPISession::GlobalMPISession	(	int *	argc,
		char ***	argv,
		std::ostream *	out = &std::cout
	)

Calls MPI_Init() if MPI is enabled.

Parameters:

argc	[in] Argment passed into main(argc,argv)
argv	[in] Argment passed into main(argc,argv)
out	[in] If out!=NULL, then a small message on each processor will be printed to this stream. The default is &std::cout.

If the option --teuchos-suppress-startup-banner is found, the this option will be removed from argv[] before being passed to MPI_Init(...) and the startup output message to *out will be suppressed.

Warning! This constructor can only be called once per executable or an error is printed to *out and an std::exception will be thrown!

Definition at line 39 of file Teuchos_GlobalMPISession.cpp.

Teuchos::GlobalMPISession::~GlobalMPISession

(

)

Calls MPI_Finalize() if MPI is enabled.

Definition at line 100 of file Teuchos_GlobalMPISession.cpp.

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Member Function Documentation

bool Teuchos::GlobalMPISession::mpiIsInitialized

(

)

[static]

Return if MPI is initialized or not.

Definition at line 114 of file Teuchos_GlobalMPISession.cpp.

bool Teuchos::GlobalMPISession::mpiIsFinalized

(

)

[static]

Return if MPI has already been finalized.

Definition at line 120 of file Teuchos_GlobalMPISession.cpp.

int Teuchos::GlobalMPISession::getRank

(

)

[static]

Returns the process rank relative to MPI_COMM_WORLD

Returns 0 if MPI is not enabled.

Note, this function can be called even if the above constructor was never called so it is safe to use no matter how MPI_Init() got called (but it must have been called somewhere).

Examples:

CommandLineProcessor/cxx_main.cpp.

Definition at line 125 of file Teuchos_GlobalMPISession.cpp.

int Teuchos::GlobalMPISession::getNProc

(

)

[static]

Returns the number of processors relative to MPI_COMM_WORLD

Returns 1 if MPI is not enabled.

Note, this function can be called even if the above constructor was never called so it is safe to use no matter how MPI_Init() got called (but it must have been called somewhere).

Examples:

FancyOutputting_test.cpp.

Definition at line 132 of file Teuchos_GlobalMPISession.cpp.

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

• Teuchos_GlobalMPISession.hpp
• Teuchos_GlobalMPISession.cpp