File size: 5,121 Bytes
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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2019 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
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/>.
Description
Exchange data.
\*---------------------------------------------------------------------------*/
#include "Pstream.H"
#include "contiguous.H"
#include "PstreamCombineReduceOps.H"
#include "UPstream.H"
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
template<class Container, class T>
void Foam::Pstream::exchange
(
const UList<Container>& sendBufs,
const labelUList& recvSizes,
List<Container>& recvBufs,
const int tag,
const label comm,
const bool block
)
{
if (!contiguous<T>())
{
FatalErrorInFunction
<< "Continuous data only." << sizeof(T) << Foam::abort(FatalError);
}
if (sendBufs.size() != UPstream::nProcs(comm))
{
FatalErrorInFunction
<< "Size of list " << sendBufs.size()
<< " does not equal the number of processors "
<< UPstream::nProcs(comm)
<< Foam::abort(FatalError);
}
recvBufs.setSize(sendBufs.size());
if (UPstream::parRun() && UPstream::nProcs(comm) > 1)
{
label startOfRequests = Pstream::nRequests();
// Set up receives
// ~~~~~~~~~~~~~~~
forAll(recvSizes, proci)
{
label nRecv = recvSizes[proci];
if (proci != Pstream::myProcNo(comm) && nRecv > 0)
{
recvBufs[proci].setSize(nRecv);
UIPstream::read
(
UPstream::commsTypes::nonBlocking,
proci,
reinterpret_cast<char*>(recvBufs[proci].begin()),
nRecv*sizeof(T),
tag,
comm
);
}
}
// Set up sends
// ~~~~~~~~~~~~
forAll(sendBufs, proci)
{
if (proci != Pstream::myProcNo(comm) && sendBufs[proci].size() > 0)
{
if
(
!UOPstream::write
(
UPstream::commsTypes::nonBlocking,
proci,
reinterpret_cast<const char*>(sendBufs[proci].begin()),
sendBufs[proci].size()*sizeof(T),
tag,
comm
)
)
{
FatalErrorInFunction
<< "Cannot send outgoing message. "
<< "to:" << proci << " nBytes:"
<< label(sendBufs[proci].size()*sizeof(T))
<< Foam::abort(FatalError);
}
}
}
// Wait for all to finish
// ~~~~~~~~~~~~~~~~~~~~~~
if (block)
{
Pstream::waitRequests(startOfRequests);
}
}
// Do myself
recvBufs[Pstream::myProcNo(comm)] = sendBufs[Pstream::myProcNo(comm)];
}
template<class Container>
void Foam::Pstream::exchangeSizes
(
const Container& sendBufs,
labelList& recvSizes,
const label comm
)
{
if (sendBufs.size() != UPstream::nProcs(comm))
{
FatalErrorInFunction
<< "Size of container " << sendBufs.size()
<< " does not equal the number of processors "
<< UPstream::nProcs(comm)
<< Foam::abort(FatalError);
}
labelList sendSizes(sendBufs.size());
forAll(sendBufs, proci)
{
sendSizes[proci] = sendBufs[proci].size();
}
recvSizes.setSize(sendSizes.size());
allToAll(sendSizes, recvSizes, comm);
}
template<class Container, class T>
void Foam::Pstream::exchange
(
const UList<Container>& sendBufs,
List<Container>& recvBufs,
const int tag,
const label comm,
const bool block
)
{
labelList recvSizes;
exchangeSizes(sendBufs, recvSizes, comm);
exchange<Container, T>(sendBufs, recvSizes, recvBufs, tag, comm, block);
}
// ************************************************************************* //
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