MPI\_Cart\_create
mpi.cart.create creates a Cartesian structure of arbitrary dimension.
mpi.cart.create(commold=1, dims, periods, reorder=FALSE, commcart=3)
commold |
Input communicator |
dims |
Integery array of size ndims specifying the number of processes in each dimension |
periods |
Logical array of size ndims specifying whether the grid is periodic or not in each dimension |
reorder |
ranks may be reordered or not |
commcart |
The new communicator to which the Cartesian topology information is attached |
If reorder = false, then the rank of each process in the new group is the same as its rank in the old group. If the total size of the Cartesian grid is smaller than the size of the group of commold, then some processes are returned mpi.comm.null. The call is erroneous if it specifies a grid that is larger than the group size.
mpi.cart.create returns 1 if success and 0 otherwise.
Alek Hunchak and Hao Yu
#Need at least 9 slaves mpi.bcast.cmd(mpi.cart.create(1,c(3,3),c(F,T))) mpi.cart.create(1,c(3,3),c(F,T))
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