›› 2015, Vol. 30 ›› Issue (1): 74-83.doi: 10.1007/s11390-015-1505-6

Special Issue: Computer Architecture and Systems

• Special Section on Computer Architecture and Systems for Big Data • Previous Articles     Next Articles

Exploring Heterogeneous NoC Design Space in Heterogeneous GPU-CPU Architectures

Juan Fang1(方娟), Member, CCF, IEEE, Zhen-Yu Leng1(冷镇宇), Si-Tong Liu1(刘思彤), Zhi-Cheng Yao2(姚治成), Member, CCF, IEEE, Xiu-Feng Sui2(隋秀峰), Member, CCF, IEEE   

  1. 1 College of Computer Science, Beijing University of Technology, Beijing 100124, China;
    2 Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2014-07-15 Revised:2014-11-12 Online:2015-01-05 Published:2015-01-05
  • About author:Juan Fang received her Ph.D. degree in computer application technology from Beijing University of Technology in 2005. Currently she is an associate professor in College of Computer Science, Beijing University of Technology. Her research interests include multi-core computing and its application technology, and cloud computing.
  • Supported by:

    This work was supported by the National Natural Science Foundation of China under Grant Nos. 61202076, 61202062.

Computer architecture is transiting from the multicore era into the heterogeneous era in which heterogeneous architectures use on-chip networks to access shared resources and how a network is configured will likely have a significant impact on overall performance and power consumption. Recently, heterogeneous network on chip (NoC) has been proposed not only to achieve performance comparable to that of the NoCs with buffered routers but also to reduce buffer cost and energy consumption. However, heterogeneous NoC design for heterogeneous GPU-CPU architectures has not been studied in depth. This paper first evaluates the performance and power consumption of a variety of static hot-potato based heterogeneous NoCs with different buffered and bufferless router placements, which is helpful to explore the design space for heterogeneous GPU-CPU interconnection. Then it proposes Unidirectional Flow Control (UFC), a simple credit-based flow control mechanism for heterogeneous NoC in GPU-CPU architectures to control network congestion. UFC can guarantee that there are always unoccupied entries in buffered routers to receive flits coming from adjacent bufferless routers. Our evaluations show that when compared to hot-potato routing, UFC improves performance by an average of 14.1% with energy increased by an average of 5.3% only.

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