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https://develop.openfoam.com/Development/openfoam.git
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8478595a15
- The idea of broadcast streams is to replace multiple master to
subProcs communications with a single MPI_Bcast.
if (Pstream::master())
{
OPBstream toAll(Pstream::masterNo());
toAll << data;
}
else
{
IPBstream fromMaster(Pstream::masterNo());
fromMaster >> data;
}
// vs.
if (Pstream::master())
{
for (const int proci : Pstream::subProcs())
{
OPstream os(Pstream::commsTypes::scheduled, proci);
os << data;
}
}
else
{
IPstream is(Pstream::commsTypes::scheduled, Pstream::masterNo());
is >> data;
}
Can simply use UPstream::broadcast() directly for contiguous data
with known lengths.
Based on ideas from T.Aoyagi(RIST), A.Azami(RIST)
148 lines
3.6 KiB
C
148 lines
3.6 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | www.openfoam.com
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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Copyright (C) 2022 OpenCFD Ltd.
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Application
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Test-parallel-broadcast
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Description
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Test for various broadcast routines.
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\*---------------------------------------------------------------------------*/
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#include "List.H"
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#include "argList.H"
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#include "Time.H"
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#include "vector.H"
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#include "IPstream.H"
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#include "OPstream.H"
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#include "IOstreams.H"
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using namespace Foam;
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// This is what our new scatter will look like inside
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template<class Type>
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void testBroadcastStream
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(
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Type& value,
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const label comm = UPstream::worldComm
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)
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{
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Info<< nl << "is_contiguous:" << is_contiguous<Type>::value << endl;
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Pout<< "pre-broadcast: " << value << endl;
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if (is_contiguous<Type>::value)
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{
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UPstream::broadcast
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(
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reinterpret_cast<char*>(&value),
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sizeof(Type),
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comm,
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UPstream::masterNo()
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);
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}
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else
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{
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if (UPstream::master())
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{
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OPBstream toAll(UPstream::masterNo(), comm);
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toAll << value;
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}
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else
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{
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IPBstream fromMaster(UPstream::masterNo(), comm);
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fromMaster >> value;
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}
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}
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Pout<< "post-broadcast: " << value << endl;
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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int main(int argc, char *argv[])
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{
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argList::noCheckProcessorDirectories();
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#include "setRootCase.H"
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#include "createTime.H"
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{
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label value = -1;
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if (Pstream::master())
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{
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value = UPstream::nProcs();
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}
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testBroadcastStream(value);
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}
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{
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labelList values;
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if (Pstream::master())
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{
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values = identity(UPstream::nProcs());
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}
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testBroadcastStream(values);
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}
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{
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wordList values;
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if (Pstream::master())
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{
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values.resize(UPstream::nProcs());
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forAll(values, i)
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{
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values[i] = "value_" + Foam::name(i);
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}
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}
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testBroadcastStream(values);
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}
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{
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vector values(vector::uniform(-1));
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if (Pstream::master())
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{
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values = vector(1,2,3);
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}
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testBroadcastStream(values);
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}
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{
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FixedList<vector, 3> values(vector::uniform(-1));
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if (Pstream::master())
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{
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values = vector(1,2,3);
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}
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testBroadcastStream(values);
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}
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Info<< "End\n" << endl;
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return 0;
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}
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// ************************************************************************* //
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