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<p><b>Abstract</b>—Multidestination message passing has been proposed as an attractive mechanism for efficiently implementing multicast and other collective operations on direct networks. However, applying this mechanism to switch-based parallel systems is nontrivial. In this paper, we propose alternative switch architectures with differing buffer organizations to implement multidestination worms on switch-based parallel systems. First, we discuss issues related to such implementation (deadlock-freedom, replication mechanisms, header encoding, and routing). Next, we demonstrate how an existing central-buffer-based switch architecture supporting unicast message passing can be enhanced to accommodate multidestination message passing. Similarly, implementing multidestination worms on an input-buffer-based switch architecture is discussed, and two architectural alternatives are presented that reduce the wiring complexity in a practical switch implementation. The central-buffer-based and input-buffer-based implementations are evaluated against each other, as well as against the corresponding software-based schemes. Simulation experiments under a range of traffic (multiple multicast, bimodal, varying degree of multicast, and message length) and system size are used for evaluation. The study demonstrates the superiority of the central-buffer-based switch architecture. It also indicates that under bimodal traffic the central-buffer-based hardware multicast implementation affects background unicast traffic less adversely compared to a software-based multicast implementation. These results show that multidestination message passing can be applied easily and effectively to switch-based parallel systems to deliver good multicast and collective communication performance.</p>
Parallel computer architecture, switch/router architecture, wormhole switching, cut-through switching, multicast, broadcast, collective communication, interconnection networks, performance evaluation.

D. K. Panda, C. B. Stunkel and R. Sivaram, "Implementing Multidestination Worms in Switch-Based Parallel Systems: Architectural Alternatives and Their Impact," in IEEE Transactions on Parallel & Distributed Systems, vol. 11, no. , pp. 794-812, 2000.
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