mpi.dims.create: MPI\_Dims\_create
In snoweye/Rmpi_PROF: Interface (Wrapper) to MPI (Message-Passing Interface)

Description Usage Arguments Details Value Author(s) References See Also Examples

mpi.dims.create Create a Cartesian dimension used by mpi.cart.create.

1	mpi.dims.create(nnodes, ndims, dims=integer(ndims))

`nnodes`	Number of nodes in a cluster
`ndims`	Number of dimension in a Cartesian topology
`dims`	Initial dimension numbers

The entries in the return value are set to describe a Cartesian grid with ndims dimensions and a total of nnodes nodes. The dimensions are set to be as close to each other as possible, using an appropriate divisibility algorithm. The return value can be constrained by specifying positive number(s) in dims. Only those 0 values in dims are modified by mpi.dims.create.

mpi.dims.create returns the dimension vector used by that in mpi.cart.create.

Hao Yu

http://www.lam-mpi.org/, http://www-unix.mcs.anl.gov/mpi/www/www3/

mpi.cart.create

#What is the dim numbers of 2 dim Cartersian topology under a grid of 36 nodes
mpi.dims.create(36,2)	#return c(6,6)
#Constrained dim numbers
mpi.dims.create(12,2,c(0,4)) #return c(9,4)