The Distribution of Waiting Times in Clocked Multistage Interconnection Networks
IEEE Transactions on Computers
SPECTS'09 Proceedings of the 12th international conference on Symposium on Performance Evaluation of Computer & Telecommunication Systems
International Journal of Network Management
Future Generation Computer Systems
Hi-index | 0.01 |
Multistage interconnection networks with crossbar switches are a major component of parallel machines. In this paper we analyze Banyan networks of k by k switches and with finite buffers. The exact solution of the steady state distribution of the first stage is derived in the situation where packets are lost when they encounter a full buffer (Assumption A). The solution is a linear combination of k-1 geometrics. We use this to get an approximation for the steady state distributions in the second stage and beyond. As a side effect, the infinite buffer case is solved, confirming known results. Our results are validated by extensive simulations. An alternate situation of networks where full buffers may block previous switches is also analyzed through an approximation technique (Assumption B).