MPI_Comm_spawn_multiple

short description

Synopsis

int MPI_Comm_spawn_multiple(int count, char *array_of_commands[],
                          char **array_of_argv[], const int array_of_maxprocs[],
                          const MPI_Info array_of_info[], int root, MPI_Comm comm,
                          MPI_Comm *intercomm, int array_of_errcodes[])

Input Parameters

count: number of commands (positive integer, significant to MPI only at root
array_of_commands: programs to be executed (array of strings, significant only at root)
array_of_argv: arguments for commands (array of array of strings, significant only at root)
array_of_maxprocs: maximum number of processes to start for each command (array of integer, significant only at root)
array_of_info: info objects telling the runtime system where and how to start processes (array of handles, significant only at root)
root: rank of process in which previous arguments are examined (integer)
comm: intracommunicator containing group of spawning processes (handle)

Output Parameters

intercomm: intercommunicator between original group and newly spawned group (handle)
array_of_errcodes: one error code per process (array of integer)

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. ierris 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 INTEGERin 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 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 guarentee 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_COMM: Invalid communicator. A common error is to use a null communicator in a call (not even allowed in MPI_Comm_rank).

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_SPAWN