celeritas::ScopedMpiInit Class Reference

RAII class for initializing and finalizing MPI. More...

#include <ScopedMpiInit.hh>

Public Types
enum class	Status { disabled = -1 , uninitialized = 0 , initialized = 1 }
	Status of initialization. More...

Public Member Functions
	ScopedMpiInit (int *argc, char ***argv)
	Construct with argc/argv references.
	ScopedMpiInit ()
	Construct with null argc/argv when those are unavailable.
	~ScopedMpiInit ()
	Call MPI finalize on destruction.
bool	is_world_multiprocess () const
	Convenience method to determine whether a multiprocess job is running.
	CELER_DELETE_COPY_MOVE (ScopedMpiInit)

Static Public Member Functions
static Status	status ()
	Whether MPI has been initialized or disabled.

Detailed Description

RAII class for initializing and finalizing MPI.

The CELER_DISABLE_PARALLEL environment variable can be used to turn off MPI calls when built with CELERITAS_USE_MPI .

Todo:

Change to CELER_ENABLE_MPI .

Note

Unlike the MpiCommunicator and MpiOperations class, it is not necessary to link against MPI to use this class.

Member Enumeration Documentation

Status

enum class celeritas::ScopedMpiInit::Status

strong

Status of initialization.

Enumerator
disabled	Not compiled or disabled via environment.
uninitialized	MPI_Init has not been called anywhere.
initialized	MPI_Init has been called somewhere.

Constructor & Destructor Documentation

ScopedMpiInit()

celeritas::ScopedMpiInit::ScopedMpiInit	(	int *	argc,
		char ***	argv
	)

Construct with argc/argv references.

OpenMPI does not modify or access these, but other implementations might potentially.

Member Function Documentation

CELER_DELETE_COPY_MOVE()

celeritas::ScopedMpiInit::CELER_DELETE_COPY_MOVE

(

ScopedMpiInit

)

Prevent copying and moving for RAII class

is_world_multiprocess()

bool celeritas::ScopedMpiInit::is_world_multiprocess

(

)

const

Convenience method to determine whether a multiprocess job is running.

This is a shortcut for comm_world().size() > 1 meant primarily for applications. Linking against MPI is not required to use it.

status()

auto celeritas::ScopedMpiInit::status ( )

static

Whether MPI has been initialized or disabled.

NOTE: This function cannot call the CELER_LOG macros because those macros query the status.

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

• ScopedMpiInit.hh
• ScopedMpiInit.cc