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MPI_Comm_set_info(3) MPI MPI_Comm_set_info(3) NAME MPI_Comm_set_info - Set new values for the hints of the communicator associated with comm SYNOPSIS int MPI_Comm_set_info(MPI_Comm comm, MPI_Info info) INPUT PARAMETERS comm - communicator (handle) info - info object (handle) NOTES The call is collective on the group of comm. The info object may be different on each process, but any info entries that an implementation requires to be the same on all processes must appear with the same value in each process info object. INFO HINTS mpi_assert_no_any_tag - boolean, default = false. If set to true, user promises that MPI_ANY_TAG will not be used with the communicator. This poten- tially allows MPICH to treat messages with different tags inde- pendent and seek to improve performance, e.g. by employ multiple network context. mpi_assert_no_any_source - boolean, default = false. If set to true, user promises that MPI_ANY_SOURCE will not be used with the communicator. This po- tentially allows MPICH to treat messages send to different ranks or receive from different ranks independent and seek to improve performance, e.g. by employ multiple network context. mpi_assert_exact_length - boolean, default = false. If set to true, user promises that the lengths of messages received by the process will always equal to the size of the corresponding receive buffers. mpi_assert_allow_overtaking - boolean, default = false. If set to true, user asserts that send operations are not required to be matched at the receiver in the order in which the send operations were performed by the sender, and receive operations are not required to be matched in the order in which they were performed by the receivers. mpi_assert_strict_persistent_collective_ordering - boolean, default = false. If set to true, then the implemen- tation may assume that all the persistent collective operations are started in the same order across all MPI processes in the group of the communicator. It is required that if this assertion is made on one member of the communicator s group, then it must be made on all members of that communicator s group with the same value. 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 integer 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 statement. 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 argument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error handler may be changed with MPI_Comm_set_errhandler (for com- municators), MPI_File_set_errhandler (for files), and MPI_Win_set_er- rhandler (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 when- ever possible. MPI_SUCCESS - No error; MPI routine completed successfully. MPI_ERR_COMM - Invalid communicator. A common error is to use a null commu- nicator in a call (not even allowed in MPI_Comm_rank ). MPI_ERR_INFO - Invalid Info MPI_ERR_OTHER - Other error; use MPI_Error_string to get more information about this error code. 2/3/2025 MPI_Comm_set_info(3)
NAME | SYNOPSIS | INPUT PARAMETERS | NOTES | INFO HINTS | THREAD AND INTERRUPT SAFETY | NOTES FOR FORTRAN | ERRORS
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