NAME

HPL_all_reduce - All reduce operation.

SYNOPSIS

#include "hpl.h"

int HPL_all_reduce( void * BUFFER, const int COUNT, const HPL_T_TYPE DTYPE, const HPL_T_OP OP, MPI_Comm COMM );

DESCRIPTION

HPL_all_reduce performs a global reduce operation across all processes of a group leaving the results on all processes.

ARGUMENTS

BUFFER (local input/global out void *

On entry, BUFFER points to the buffer to be combined. On exit, this array contains the combined data and is identical on all processes in the group.

COUNT (global input) const int

On entry, COUNT indicates the number of entries in BUFFER. COUNT must be at least zero.

DTYPE (global input) const HPL_T_TYPE

On entry, DTYPE specifies the type of the buffers operands.

OP (global input) const HPL_T_OP

On entry, OP is a pointer to the local combine function.

COMM (global/local input) MPI_Comm

The MPI communicator identifying the process collection.

SEE ALSO

HPL_broadcast (3), HPL_reduce (3), HPL_barrier (3), HPL_min (3), HPL_max (3), HPL_sum (3).