HPL_all_reduce man page

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).

Info

October 26, 2012 HPL 2.1 HPL Library Functions