MPI_Session_init(3) MPI MPI_Session_init(3) NAME MPI_Session_init - Initialize an MPI session SYNOPSIS int MPI_Session_init(MPI_Info info, MPI_Errhandler errhandler, MPI_Session *session) INPUT PARAMETERS info - info object to specify thread support level and MPI implementation specific resources (handle) errhandler - error handler to invoke in the event that an error is encountered during this function call (handle) OUTPUT PARAMETERS session - new session (handle) INFO HINTS FOLLOWING KEYS ARE SUPPORTED "thread_level" - Set MPI thread level. The default is MPI_THREAD_MULTIPLE. Note this is different from the default in MPI_Init. MPICH does not sup- port different thread levels in different sessions. The provided thread level will be the one set by the first MPI_Session_init, MPI_Init, or MPI_Init_thread. "mpi_memory_alloc_kinds" - Set the memory allocation kinds to be used by by the calling MPI process on MPI objects derived from the Session. THREAD AND INTERRUPT SAFETY This routine is thread-safe. This means that this routine may be safely used by multiple threads without the need for any user-provided thread locks. However, the routine is not interrupt safe. Typically, this is due to the use of memory allocation routines such as malloc or other non-MPICH runtime routines that are themselves not interrupt-safe. NOTES FOR FORTRAN All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argument ierr at the end of the argument list. ierr is an inte- ger and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the call state- ment. All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran. ERRORS All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as the value of the function and Fortran routines in the last ar- gument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error han- dler may be changed with MPI_Comm_set_errhandler (for communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but its use is deprecated. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible. MPI_SUCCESS - No error; MPI routine completed successfully. MPI_ERR_ARG - Invalid argument. Some argument is invalid and is not identified by a specific error class (e.g., MPI_ERR_RANK ). MPI_ERR_INFO - Invalid Info MPI_ERR_OTHER - Other error; use MPI_Error_string to get more information about this error code. 4/10/2026 MPI_Session_init(3)
NAME | SYNOPSIS | INPUT PARAMETERS | OUTPUT PARAMETERS | INFO HINTS | FOLLOWING KEYS ARE SUPPORTED | THREAD AND INTERRUPT SAFETY | NOTES FOR FORTRAN | ERRORS
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