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ENH: avoid prior communication when using mapDistribute

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- in most cases can simply construct mapDistribute with the sendMap
  and have it take care of communication and addressing for the
  corresponding constructMap.

  This removes code duplication, which in some cases was also using
  much less efficient mechanisms (eg, combineReduce on list of
  lists, or an allGatherList on the send sizes etc) and also
  reduces the number of places where Pstream::exchange/exchangeSizes
  is being called.

ENH: reduce communication in turbulentDFSEMInlet

- was doing an allGatherList to populate a mapDistribute.
  Now simply use PstreamBuffers mechanisms directly.
This commit is contained in:
Mark Olesen
2023-02-14 11:24:22 +01:00
parent 1ce7a62209
commit fb69a54bc3
12 changed files with 105 additions and 534 deletions
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39
src/sampling/meshToMesh/meshToMeshParallelOps.C
View File

@ -6,7 +6,7 @@
\\/ M anipulation |
-------------------------------------------------------------------------------
Copyright (C) 2012-2017 OpenFOAM Foundation
Copyright (C) 2015-2022 OpenCFD Ltd.
Copyright (C) 2015-2023 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
@ -232,42 +232,7 @@ Foam::autoPtr<Foam::mapDistribute> Foam::meshToMesh::calcProcMap
}
}
// send over how many tgt cells I need to receive from each
// processor
labelListList sendSizes(Pstream::nProcs());
sendSizes[Pstream::myProcNo()].resize(Pstream::nProcs());
forAll(sendMap, proci)
{
sendSizes[Pstream::myProcNo()][proci] = sendMap[proci].size();
}
Pstream::allGatherList(sendSizes);
// determine order of receiving
labelListList constructMap(Pstream::nProcs());
label segmentI = 0;
forAll(constructMap, proci)
{
// what I need to receive is what other processor is sending
// to me
label nRecv = sendSizes[proci][Pstream::myProcNo()];
constructMap[proci].setSize(nRecv);
for (label i = 0; i < nRecv; i++)
{
constructMap[proci][i] = segmentI++;
}
}
return autoPtr<mapDistribute>::New
(
segmentI, // size after construction
std::move(sendMap),
std::move(constructMap)
);
return autoPtr<mapDistribute>::New(std::move(sendMap));
break;
}
}