NAME

MPI_Send - Perform a potentially blocking send of a buffer

SYNOPSIS

#include <mpi.h> 
int MPI_Send(void *buf , int count , MPI_Datatype datatype , int dest , int tag , MPI_Comm comm ); 
#include <pmpi.h> 
int PMPI_Send(void *buf , int count , MPI_Datatype datatype , int dest , int tag , MPI_Comm comm ); 

INPUT PARAMETERS

buf - buffer (array)

count - count of elements in buffer (integer)

datatype - type of elements in buffer (handle)

dest - destination rank (integer)

tag - communication tag (integer)

comm - communicator for message (handle)

DESCRIPTION

The MPI_Send() function is used to send a message to the process with rank dest in the communicator comm , using the tag envelope. The send may (or may not) block depending on the amount of internal buffering done in the MPI implementation. The send consists of count elements of type datatype in an array specified by buf .

The communicator must be a valid one (not MPI_COMM_NULL). PMPI_Send() is the profiling version of this function.

If the destination is MPI_PROC_NULL then no send is posted, and MPI_SUCCESS is returned.

ERRORS

All MPI routines except for MPI_Wtime and MPI_Wtick return an error value. The the current MPI error handler is invoked if this 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.

MPI_SUCCESS - No error;

MPI_ERR_COMM - Invalid communicator;

MPI_ERR_COUNT - Invalid element count;

MPI_ERR_BUFFER - Invalid buffer;

MPI_ERR_TAG - Invalid tag;

MPI_ERR_TYPE - Invalid data type;

MPI_ERR_RANK - Invalid destination;

MPI_ERR_INTERN - Out of memory error.

SEE ALSO

MPI_Isend (3) MPI_Rsend (3) MPI_Irsend (3) MPI_Ssend (3) MPI_Issend (3) MPI_Bsend (3) MPI_Ibsend (3) MPI_Recv (3)

• Lockless
• MPI Documentation
• MPI_Send