NAME

HPL_sdrv - Send and receive a message.

SYNOPSIS

#include "hpl.h"

int HPL_sdrv( double * SBUF, int SCOUNT, int STAG, double * RBUF, int RCOUNT, int RTAG, int PARTNER, MPI_Comm COMM );

DESCRIPTION

HPL_sdrv is a simple wrapper around MPI_Sendrecv. Its main purpose is to allow for some experimentation and tuning of this simple function. Messages of length less than or equal to zero are not sent nor received. Successful completion is indicated by the returned error code HPL_SUCCESS.

ARGUMENTS

SBUF (local input) double *

On entry, SBUF specifies the starting address of buffer to be sent.

SCOUNT (local input) int

On entry, SCOUNT specifies the number of double precision entries in SBUF. SCOUNT must be at least zero.

STAG (local input) int

On entry, STAG specifies the message tag to be used for the sending communication operation.

RBUF (local output) double *

On entry, RBUF specifies the starting address of buffer to be received.

RCOUNT (local input) int

On entry, RCOUNT specifies the number of double precision entries in RBUF. RCOUNT must be at least zero.

RTAG (local input) int

On entry, RTAG specifies the message tag to be used for the receiving communication operation.

PARTNER (local input) int

On entry, PARTNER specifies the rank of the collaborative process in the communication space defined by COMM.

COMM (local input) MPI_Comm

The MPI communicator identifying the communication space.

SEE ALSO

HPL_send (3), HPL_recv (3).