MPI\_Cart\_shift
mpi.cart.shift shifts the Cartesian topology in both manners, displacement
and direction.
mpi.cart.shift(comm=3, direction, disp)
comm |
Communicator with Cartesian structure |
direction |
Coordinate dimension of the shift |
disp |
displacement (>0 for upwards or left shift, <0 for downwards or right shift) |
mpi.cart.shift provides neighbor ranks from given direction and displacement.
The direction argument indicates the dimension of the shift. direction=1 means the first dim,
direction=2 means the second dim, etc. disp=1 or -1 provides immediate neighbor ranks and disp=2
or -2 provides neighbor's neighbor ranks. Negative ranks mean out of boundary. They correspond to
mpi.proc.null.
mpi.cart.shift returns a vector containing information regarding the
rank of the source process and rank of the destination process.
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)) mpi.remote.exec(mpi.cart.shift(3,2,1))#get neighbor ranks mpi.remote.exec(mpi.cart.shift(3,1,1))
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