HPL_all_reduce man page on DragonFly

HPL_all_reduce man page on DragonFly

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HPL_all_reduce(3)	     HPL Library Functions	     HPL_all_reduce(3)

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).

HPL 2.1			       October 26, 2012		     HPL_all_reduce(3)

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