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37 * Implements functions from init.h.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
40 * \ingroup module_utility
42 #include "gromacs/utility/init.h"
47 #include "gromacs/utility/gmxmpi.h"
50 #include "gromacs/utility/common.h"
51 #include "gromacs/utility/gmxassert.h"
59 //! Maintains global counter of attempts to initialize MPI
60 int g_initializationCounter = 0;
64 void init(int *argc, char ***argv)
67 int isInitialized = 0, isFinalized = 0;
68 MPI_Finalized(&isFinalized);
69 GMX_RELEASE_ASSERT(!isFinalized, "Invalid attempt to initialize MPI after finalization");
70 MPI_Initialized(&isInitialized);
73 if (0 == g_initializationCounter)
75 // Some other code has already initialized MPI, so bump the counter so that
76 // we know not to finalize MPI ourselves later.
77 g_initializationCounter++;
83 (void) fah_MPI_Init(argc, argv);
85 (void) MPI_Init(argc, argv);
88 // Bump the counter to record this initialization event
89 g_initializationCounter++;
92 GMX_UNUSED_VALUE(argc);
93 GMX_UNUSED_VALUE(argv);
100 GMX_RELEASE_ASSERT(0 < g_initializationCounter, "Excess attempt to finalize MPI");
101 // Bump the counter to record this finalization event
102 g_initializationCounter--;
104 if (0 == g_initializationCounter)
106 /* We sync the processes here to try to avoid problems
107 * with buggy MPI implementations that could cause
108 * unfinished processes to terminate.
110 MPI_Barrier(MPI_COMM_WORLD);
112 /* Apparently certain mpich implementations cause problems
113 * with MPI_Finalize. In that case comment out MPI_Finalize.