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MPI_Startall(3) MPI MPI_Startall(3) NAME MPI_Startall - Starts a collection of persistent requests SYNOPSIS int MPI_Startall(int count, MPI_Request array_of_requests[]) INPUT PARAMETERS count - list length (non-negative integer) INPUT/OUTPUT PARAMETERS array_of_requests - array of requests (handle) NOTES Unlike MPI_Waitall , MPI_Startall does not provide a mechanism for re- turning multiple errors nor pinpointing the request(s) involved. Fur- thermore, the behavior of MPI_Startall after an error occurs is not de- fined by the MPI standard. If well-defined error reporting and behav- ior are required, multiple calls to MPI_Start should be used instead. 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_COUNT - Invalid count argument. Count arguments must be non-negative; a count of zero is often valid. MPI_ERR_REQUEST - Invalid MPI_Request . Either null or, in the case of a MPI_Start or MPI_Startall , not a persistent request. MPI_ERR_OTHER - Other error; use MPI_Error_string to get more information about this error code. 2/3/2025 MPI_Startall(3)
NAME | SYNOPSIS | INPUT PARAMETERS | INPUT/OUTPUT PARAMETERS | NOTES | THREAD AND INTERRUPT SAFETY | NOTES FOR FORTRAN | ERRORS
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