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MPI_Finalize - Finish using the MPI library


#include <mpi.h> int MPI_Finalize(void);

#include <pmpi.h> int PMPI_Finalize(void);

#include <mpi.h> void MPI::Finalize(void);



The MPI_Finalize() function is used to shut down the MPI implementation. No MPI function other than MPI_Finalized() may be called after this is done.

This function will terminate all ranks except for the initial process used to start MPI. All buffers will be freed, and all MPI network communication will end. This function will free all attributes attached to MPI_COMM_SELF and MPI_COMM_WORLD. By having an attribute delete function for these communicators, code may be notified of MPI's shutdown.

This function will detach any buffers attached by the MPI_Buffer_attach() function.

PMPI_Finalize() is the profiling version of this function.


All MPI routines except for MPI_Wtime and MPI_Wtick return an error code. The the current MPI error handler is invoked if the return value is not MPI_SUCCESS. The default error handler aborts, but this may be changed with by using the MPI_Errhandler_set() function. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned instead. Note that MPI does not guarentee that an MPI program can continue past an error. In this implementation, all errors except MPI_ERR_INTERN or MPI_ERR_OTHER should always be recoverable.

In C, the error code is passed as the return value. In FORTRAN, all functions have an parameter ierr which returns the error code. MPI C++ functions do not directly return an error code. However, C++ users may want to use the MPI::ERRORS_THROW_EXCEPTIONS handler. This will throw an MPI::Exception with the corresponding error code. To prevent exceptions from being raised from within C and Fortran code, they will see all error return values as MPI_ERR_PENDING when this handler is chosen. In this implementation, call MPI::throw_exception() to throw the correct exception if this occurs.

MPI_SUCCESS - No error;

MPI_ERR_PENDING - Pending exception;

MPI_ERR_OTHER - MPI has already shut down;

MPI_ERR_INTERN - Out of Memory. This may be fatal.


MPI_Init (3) MPI_Initialized (3) MPI_Finalized (3) MPI_Abort (3) MPI_Buffer_detach (3) MPI_Keyval_create (3)

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