PstreamReduceOps.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2016 OpenCFD Ltd.
-------------------------------------------------------------------------------
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/>.
 
InNamespace
    Foam
 
Description
    Inter-processor communication reduction functions.
 
\*---------------------------------------------------------------------------*/
 
#ifndef PstreamReduceOps_H
#define PstreamReduceOps_H
 
#include "ops.H"
#include "vector2D.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
// Reduce operation with user specified communication schedule
template<class T, class BinaryOp>
void reduce
(
    const List<UPstream::commsStruct>& comms,
    T& Value,
    const BinaryOp& bop,
    const int tag,
    const label comm
)
{
    if (UPstream::warnComm != -1 && comm != UPstream::warnComm)
    {
        Pout<< "** reducing:" << Value << " with comm:" << comm
            << endl;
        error::printStack(Pout);
    }
    Pstream::gather(comms, Value, bop, tag, comm);
    Pstream::scatter(comms, Value, tag, comm);
}
 
 
// Reduce using either linear or tree communication schedule
template<class T, class BinaryOp>
void reduce
(
    T& Value,
    const BinaryOp& bop,
    const int tag = Pstream::msgType(),
    const label comm = UPstream::worldComm
)
{
    if (UPstream::nProcs(comm) < UPstream::nProcsSimpleSum)
    {
        reduce(UPstream::linearCommunication(comm), Value, bop, tag, comm);
    }
    else
    {
        reduce(UPstream::treeCommunication(comm), Value, bop, tag, comm);
    }
}
 
 
// Reduce using either linear or tree communication schedule
template<class T, class BinaryOp>
T returnReduce
(
    const T& Value,
    const BinaryOp& bop,
    const int tag = Pstream::msgType(),
    const label comm = UPstream::worldComm
)
{
    T WorkValue(Value);
 
    if (UPstream::nProcs(comm) < UPstream::nProcsSimpleSum)
    {
        reduce
        (
            UPstream::linearCommunication(comm),
            WorkValue,
            bop,
            tag,
            comm
        );
    }
    else
    {
        reduce
        (
            UPstream::treeCommunication(comm),
            WorkValue,
            bop,
            tag,
            comm
        );
    }
 
    return WorkValue;
}
 
 
// Reduce with sum of both value and count (for averaging)
template<class T>
void sumReduce
(
    T& Value,
    label& Count,
    const int tag = Pstream::msgType(),
    const label comm = UPstream::worldComm
)
{
    reduce(Value, sumOp<T>(), tag, comm);
    reduce(Count, sumOp<label>(), tag, comm);
}
 
 
// Non-blocking version of reduce. Sets request.
template<class T, class BinaryOp>
void reduce
(
    T& Value,
    const BinaryOp& bop,
    const int tag,
    const label comm,
    label& request
)
{
    NotImplemented;
}
 
 
// Insist there are specialisations for the common reductions of scalar(s)
void reduce
(
    scalar& Value,
    const sumOp<scalar>& bop,
    const int tag = Pstream::msgType(),
    const label comm = UPstream::worldComm
);
 
void reduce
(
    scalar& Value,
    const minOp<scalar>& bop,
    const int tag = Pstream::msgType(),
    const label comm = UPstream::worldComm
);
 
void reduce
(
    vector2D& Value,
    const sumOp<vector2D>& bop,
    const int tag = Pstream::msgType(),
    const label comm = UPstream::worldComm
);
 
void sumReduce
(
    scalar& Value,
    label& Count,
    const int tag = Pstream::msgType(),
    const label comm = UPstream::worldComm
);
 
void reduce
(
    scalar& Value,
    const sumOp<scalar>& bop,
    const int tag,
    const label comm,
    label& request
);
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //