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MPI_Cart_create(3) MPI MPI_Cart_create(3) NAME MPI_Cart_create - Makes a new communicator to which topology informa- tion has been attached SYNOPSIS int MPI_Cart_create(MPI_Comm comm_old, int ndims, MPICH2_CONST int *dims, MPICH2_CONST int *periods, int reorder, MPI_Comm *comm_cart) INPUT PARAMETERS comm_old - input communicator (handle) ndims - number of dimensions of cartesian grid (integer) dims - integer array of size ndims specifying the number of processes in each dimension periods - logical array of size ndims specifying whether the grid is pe- riodic (true) or not (false) in each dimension reorder - ranking may be reordered (true) or not (false) (logical) OUTPUT PARAMETER comm_cart - communicator with new cartesian topology (handle) ALGORITHM We ignore reorder info currently. 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 guarentee 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_TOPOLOGY - Invalid topology. Either there is no topology associated with this communicator, or it is not the correct type (e.g., MPI_CART when expecting MPI_GRAPH ). MPI_ERR_DIMS - Invalid dimension argument. A dimension argument is null or its length is less than or equal to zero. MPI_ERR_ARG - Invalid argument. Some argument is invalid and is not identi- fied by a specific error class (e.g., MPI_ERR_RANK ). LOCATION src/mpi/topo/cart_create.c 9/20/2012 MPI_Cart_create(3)
NAME | SYNOPSIS | INPUT PARAMETERS | OUTPUT PARAMETER | ALGORITHM | THREAD AND INTERRUPT SAFETY | NOTES FOR FORTRAN | ERRORS | LOCATION
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