1HPL_all_reduce(3)            HPL Library Functions           HPL_all_reduce(3)
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NAME

6       HPL_all_reduce - All reduce operation.
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SYNOPSIS

9       #include "hpl.h"
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11       int  HPL_all_reduce(  void  * BUFFER, const int COUNT, const HPL_T_TYPE
12       DTYPE, const HPL_T_OP OP, MPI_Comm COMM );
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DESCRIPTION

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

19       BUFFER  (local input/global out void *
20               On  entry,   BUFFER  points to  the  buffer to be combined.  On
21               exit, this array contains the combined data and   is  identical
22               on all processes in the group.
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24       COUNT   (global input)          const int
25               On  entry,   COUNT  indicates the number of entries in  BUFFER.
26               COUNT must be at least zero.
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28       DTYPE   (global input)          const HPL_T_TYPE
29               On entry,  DTYPE  specifies the type of the buffers operands.
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31       OP      (global input)          const HPL_T_OP
32               On entry, OP is a pointer to the local combine function.
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34       COMM    (global/local input)    MPI_Comm
35               The MPI communicator identifying the process collection.
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SEE ALSO

38       HPL_broadcast (3),   HPL_reduce (3),   HPL_barrier (3),    HPL_min (3),
39       HPL_max (3), HPL_sum (3).
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43HPL 2.2                        February 24, 2016             HPL_all_reduce(3)
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