PstreamCombineReduceOps.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
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-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
InClass
    Foam
 
Description
    Combination-Reduction operation for a parallel run.  The
    information from all nodes is collected on the master node,
    combined using the given combination function and the result is
    broadcast to all nodes
 
 
\*---------------------------------------------------------------------------*/
 
#ifndef PstreamCombineReduceOps_H
#define PstreamCombineReduceOps_H
 
#include "UPstream.H"
#include "Pstream.H"
#include "ops.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
template<class T, class CombineOp>
void combineReduce
(
    const List<UPstream::commsStruct>& comms,
    T& Value,
    const CombineOp& cop,
    const int tag,
    const label comm
)
{
    Pstream::combineGather(comms, Value, cop, tag, comm);
    Pstream::combineScatter(comms, Value, tag, comm);
}
 
 
template<class T, class CombineOp>
void combineReduce
(
    T& Value,
    const CombineOp& cop,
    const int tag = Pstream::msgType(),
    const label comm = Pstream::worldComm
)
{
    if (UPstream::nProcs(comm) < UPstream::nProcsSimpleSum)
    {
        Pstream::combineGather
        (
            UPstream::linearCommunication(comm),
            Value,
            cop,
            tag,
            comm
        );
        Pstream::combineScatter
        (
            UPstream::linearCommunication(comm),
            Value,
            tag,
            comm
        );
    }
    else
    {
        Pstream::combineGather
        (
            UPstream::treeCommunication(comm),
            Value,
            cop,
            tag,
            comm
        );
        Pstream::combineScatter
        (
            UPstream::treeCommunication(comm),
            Value,
            tag,
            comm
        );
    }
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //