processorTopology.C

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    Copyright (C) 2023 OpenCFD Ltd.
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License
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#include "processorTopology.H"
#include "Pstream.H"

// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::processorTopology::processorTopology()
:
    procPatchMap_(0),
    comm_(UPstream::worldComm)
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

const Foam::labelList& Foam::processorTopology::procNeighbours() const
{
    if (procNeighbours_.empty() && !procPatchMap_.empty())
    {
        // My neighbouring procs in ascending sorted order
        procNeighbours_ = procPatchMap_.sortedToc();
    }

    return procNeighbours_;
}


// May be useful in the future...
// ------------------------------
//
// const Foam::labelUList Foam::processorTopology::below() const
// {
//     const auto& all = procNeighbours();
//
//     const auto* pivot = std::upper_bound
//     (
//         all.begin(),
//         all.end(),
//         UPstream::myProcNo(comm_)
//     );
//
//     if (pivot != all.end())
//     {
//         return UList<label>
//         (
//             const_cast<label*>(all.begin()),
//             (pivot - all.begin())
//         );
//     }
//     return UList<label>();
// }
//
//
// const Foam::labelUList Foam::processorTopology::above() const
// {
//     const auto& all = procNeighbours();
//
//     const auto* pivot = std::upper_bound
//     (
//         all.begin(),
//         all.end(),
//         UPstream::myProcNo(comm_)
//     );
//     if (pivot != all.end())
//     {
//         return UList<label>
//         (
//             const_cast<label*>(pivot),
//             (all.end() - pivot)
//         );
//     }
//     return UList<label>();
// }


const Foam::labelListList& Foam::processorTopology::procAdjacency() const
{
    if (UPstream::parRun() && procAdjacencyTable_.empty())
    {
        procAdjacencyTable_.resize(UPstream::nProcs(comm_));

        // My neighbouring procs in ascending sorted order
        procAdjacencyTable_[UPstream::myProcNo(comm_)]
            = procPatchMap_.sortedToc();

        // Synchronize on all processors
        Pstream::allGatherList(procAdjacencyTable_, UPstream::msgType(), comm_);
    }

    return procAdjacencyTable_;
}


// ************************************************************************* //