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清华大学学报(自然科学版)  2018, Vol. 58 Issue (12): 1051-1058    DOI: 10.16511/j.cnki.qhdxxb.2018.22.043
  计算机科学与技术 本期目录 | 过刊浏览 | 高级检索 |
基于列分转弯模型的片上网络路由算法
蔡源1, 罗伟2, 向东1
1. 清华大学 软件学院, 北京 100084;
2. 国网湖南省电力公司 信息通信公司, 长沙 410004
Routing algorithm based on a column-partition turn model for a network-on-chip
CAI Yuan1, LUO Wei2, XIANG Dong1
1. Software Department, Tsinghua University, Beijing 100084, China;
2. Information and Communication Company, State Grid Hunan Electric Power Company, Changsha 410004, China
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摘要 针对现有的判断片上网络路由算法是否含有死锁的方法都比较复杂,以及传统转弯模型存在不足的问题,提出了一种更简单更直观的判断路由算法是否包含死锁的算法,并证明了该算法的正确性,然后提出了一种列分转弯模型。列分转弯模型能实现针对二维mesh网络的基于虚跨步交换技术的无死锁、最短路径部分自适应路由,并且不需要额外的虚拟通道。该模型会在网络节点处限制某些转弯,从而避免死锁,类似于奇偶转弯模型。模拟实验结果表明:基于该模型的路由算法与基于奇偶转弯模型的路由算法相比,在不同的流量模式下平均延迟都有所降低,饱和点有所上升,从而提高了整个网络的性能。
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关键词 转弯模型虚跨步交换二维mesh网络无死锁部分自适应路由    
Abstract:Existing methods cannot easily determine whether a routing algorithm for a network-on-chip contains a deadlock and the traditional turn model has serious limitations. This paper presents a simple, intuitive algorithm to determine whether the routing algorithm is deadlock-free. This paper gives a proof of the algorithm's correctness. Then, a column-partition turn model is given to implement deadlock-free minimal partially adaptive routing for a virtual cut-through (VCT)-switched 2-D mesh without extra virtual channels. This algorithm avoids deadlocks by restricting the locations for certain turns, which is similar to the odd-even turn method. Simulations show that this routing algorithm reduces the average latency and increases the saturation points compared to routing algorithms based on the odd-even turn model for various traffic patterns. Therefore, this column-partition turn model improves the performance of the whole network.
Key wordsturn model    virtual cut-through switching    2-D mesh    deadlock-free    partially adaptive routing
收稿日期: 2018-04-28      出版日期: 2018-12-13
通讯作者: 向东,教授,E-mail:dxiang@tsinghua.edu.cn     E-mail: dxiang@tsinghua.edu.cn
引用本文:   
蔡源, 罗伟, 向东. 基于列分转弯模型的片上网络路由算法[J]. 清华大学学报(自然科学版), 2018, 58(12): 1051-1058.
CAI Yuan, LUO Wei, XIANG Dong. Routing algorithm based on a column-partition turn model for a network-on-chip. Journal of Tsinghua University(Science and Technology), 2018, 58(12): 1051-1058.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2018.22.043  或          http://jst.tsinghuajournals.com/CN/Y2018/V58/I12/1051
  图1 算法isDeadlockFree
  图2 奇偶转弯模型无死锁的证明过程
  图3 算法route
  图4 列分转弯模型禁止的转弯
  图5 基于列分转弯模型的算法在5×5mesh 网络中路由示例
  图6 均匀和转置流量模式下算法性能比较
  图7 热点流量模式下算法性能比较
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