commSchedule.H

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License
    This file is part of OpenFOAM.
 
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    the Free Software Foundation, either version 3 of the License, or
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Class
    Foam::commSchedule
 
Description
    Determines the order in which a set of processors should communicate
    with one another.
 
    The communication order should
      - have maximum overlap
      - allow blocking communication without deadlock
 
    Does a very simple scheduling which assumes same time for all operations.
 
    After construction:
      - schedule() gives the order in which the input communication should occur
      - procSchedule()[proci] gives per proci
 
    Does not care whether 'talking' is first send, second receive or maybe
    full swap. This is all responsibility of caller.
    See Foam::rocessorTopology for use in scheduling processor boundary swaps.
 
SourceFiles
    commSchedule.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_commSchedule_H
#define Foam_commSchedule_H
 
#include "labelPair.H"
#include "labelList.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                           Class commSchedule Declaration
\*---------------------------------------------------------------------------*/
 
class commSchedule
{
    // Private Data
 
        //- Order in which input communication has been scheduled
        labelList schedule_;
 
        //- Per processor the order in which communication has been scheduled
        labelListList procSchedule_;
 
 
public:
 
    //- Runtime type information
    ClassName("commSchedule");
 
 
    // Constructors
 
        //- Construct from wanted communication. Wanted communication is between
        //- two processors. Can be a one-way communication or
        //- two-way communication, that is up to the caller.
        //
        //  This class just
        //  determines an order for it such that any processor is only talking
        //  to one other at a time. After construction:
        //  - schedule is the order in which comms is done.
        //  - procSchedule[proci] is for proci the order in which comms is done.
        commSchedule(const label nProcs, const List<labelPair>& comms);
 
 
    // Member Functions
 
        //- Order in which comms is scheduled
        const labelList& schedule() const noexcept
        {
            return schedule_;
        }
 
        //- Per processor the order in which communication has been scheduled
        const labelListList& procSchedule() const noexcept
        {
            return procSchedule_;
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //