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State-of-the-art supercomputers consist of a huge number of computing nodes that are connected by an interconnection network. Although such large-scale systems have regular organizations, scaling study on the network is not sufficient so far. This paper focuses on two-dimensional torus network with two typical routing algorithms, i.e., dimension-order and Duato's protocol, and presents steady and...
A massively parallel computer involves a large number of routers that are independent of each other. Adaptive routing methods offer high levels of flexibility in packet routing, but their performance is limited due to their locality nature. The Cross-Line method handles quasi-global information of congestion to improve performance. This paper introduces two new ideas of adaptation level and evaluation...
Parallel computers essentially employ interconnection networks. Huge-scale systems require appropriate networks that can correspond to their required performance. This paper addresses a scalability issue of uniform interconnection networks. We first propose an evaluation method suitable to large-scale networks, define critical load ratio as a common measure, and introduce introduce ramp-, step-, and...
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