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c086f22298
- split off a Pstream::genericBroadcast() which uses UOPBstream during
serialization and UOPBstream during de-serialization.
This function will not normally be used directly by callers, but
provides a base layer for higher-level broadcast calls.
- low-level UPstream broadcast of string content.
Since std::string has length and contiguous content, it is possible
to handle directly by the following:
1. broadcast size
2. resize
3. broadcast content when size != 0
Although this is a similar amount of communication as the generic
streaming version (min 1, max 2 broadcasts) it is more efficient
by avoiding serialization/de-serialization overhead.
- handle broadcast of List content distinctly.
Allows an optimized path for contiguous data, similar to how
std::string is handled (broadcast size, resize container, broadcast
content when size != 0), but can revert to genericBroadcast (streamed)
for non-contiguous data.
- make various scatter variants simple aliases for broadcast, since
that is what they are doing behind the scenes anyhow:
* scatter()
* combineScatter()
* listCombineScatter()
* mapCombineScatter()
Except scatterList() which remains somewhat different.
Beyond the additional (size == nProcs) check, the only difference to
using broadcast(List<T>&) or a regular scatter(List<T>&) is that
processor-local data is skipped. So leave this variant as-is.
STYLE: rename/prefix implementation code with 'Pstream'
- better association with its purpose and provides a unique name
159 lines
3.8 KiB
C
159 lines
3.8 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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template<class T>
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void printPre(const T& value)
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{
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Info<< nl << "is_contiguous:" << is_contiguous<T>::value << endl;
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Pout<< "pre-broadcast: " << value << endl;
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}
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template<class T>
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void printPost(const T& value)
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{
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Pout<< "post-broadcast: " << value << endl;
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}
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template<class T>
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void testBroadcast(T& value)
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{
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printPre(value);
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Pstream::broadcast(value);
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printPost(value);
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}
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template<class T>
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void testBroadcast(List<T>& values)
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{
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Info<< nl << "is_contiguous:" << is_contiguous<T>::value << endl;
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Pout<< "pre-broadcast: " << flatOutput(values) << endl;
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Pstream::broadcast(values);
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Pout<< "post-broadcast: " << flatOutput(values) << 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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testBroadcast(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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testBroadcast(values);
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}
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{
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word value;
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if (Pstream::master())
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{
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value = args.executable();
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}
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printPre(value);
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UPstream::broadcast(value); // Low-level UPstream broadcast
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printPost(value);
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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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testBroadcast(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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testBroadcast(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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scalar mult = 1;
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for (auto& v : values)
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{
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v *= mult;
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mult += 1;
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}
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}
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testBroadcast(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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