CYCLIC Distribution

Deal out elements of an array to processors in a round robin fashion

        PROGRAM Round_Robin
         REAL, DIMENSION(20)      :: A
 !HPF$ PROCESSORS, DIMENSION(4)   :: P
 !HPF$ DISTRIBUTE (CYCLIC) ONTO P :: A
   ....

  
Figure 19: Visualisation of CYCLIC Distribution

If an array, A has elements and is mapped onto processors each processor gets (a maximum) total of separate elements. See Figure 19.

As in the previous section, each processor gets five elements, but this time a different set of elements are received. The elements are dished out in a round-robin fashion starting from processor 1. The diagram indicates the elements that each processor is given.

The formula for the maximum number of elements that a processor can receive is the same as for BLOCK distribution.

• 2D Distribution Example