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37 * Defines functionality for communicators across physical nodes.
39 * \ingroup module_utility
43 #include "physicalnodecommunicator.h"
47 #include "gromacs/utility/basedefinitions.h"
48 #include "gromacs/utility/gmxmpi.h"
53 void MPI_Comm_free_wrapper(MPI_Comm* comm)
56 // With thread-MPI *comm is shared between ranks which causes issues with
57 // freeing. But all thread-mpi data is anyhow freed in tMPI_Finalize()
58 // and in practice *comm is always MPI_COMM_WORLD with thread-MPI.
59 // Only the thread-affinity test code uses *comm != MPI_COMM_WORLD.
65 GMX_UNUSED_VALUE(comm);
69 PhysicalNodeCommunicator::PhysicalNodeCommunicator(MPI_Comm world, int physicalNodeId)
72 int isInitialized = 0;
73 MPI_Initialized(&isInitialized);
77 MPI_Comm_size(world, &sizeOfWorld);
80 int rankWithinWorld = 0;
81 MPI_Comm_rank(world, &rankWithinWorld);
82 MPI_Comm_split(world, physicalNodeId, rankWithinWorld, &comm_);
83 auto ptr = MPI_Comm_ptr(&comm_);
85 MPI_Comm_size(comm_, &size_);
86 MPI_Comm_rank(comm_, &rank_);
90 // Handle this trivial case separately, because thread-MPI
91 // doesn't have a valid communicator when there is only
100 comm_ = MPI_COMM_NULL;
105 // Trivial case when there is no MPI support or not initialized
106 GMX_UNUSED_VALUE(world);
107 GMX_UNUSED_VALUE(physicalNodeId);
114 void PhysicalNodeCommunicator::barrier() const