An alternate dimension-order collective communication scheme on packet-switched 2D-mesh network

Cluster computing, which employs many cheap node machines, will replace expensive supercomputers. However, there exist only a few enhanced communication schemes for cheap packet switches, especially in the case of collective communication. We devised a new collective communication scheme from original dimension-order routing. The proposed scheme is mainly aimed at a non-uniform traffic situation by communication locality that causes longer communication delays than those in a uniform-traffic situation. By adding a 'flow bit' in each packet, packets can traverse, alternating their directions on hop by hop. The new scheme is devised for a 2D mesh and enhanced the original X-Y routing.