Microprocessors and Microsystems Volume 35, Issue 2, March 2011, Pages 230–245 Special issue on Network-on-Chip Architectures and Design Methodologies Francisco Trivino, Jose L. Sanchez, Francisco J. Alfaro, Jose Flich 王健宇

 Introduction  NoC virtualization  Performance evaluation  Experimental results  Conclusions 2

 Introduction  NoC virtualization  Performance evaluation  Experimental results  Conclusions 3

 Chip-mutiprocessors (CMP) are expected in the future  Applications run in CMP increase ◦ Applications share resource, CMP load increase ◦ Affect the performance of applications  Isolate the traffic of different applications to increase applications performance ◦ Partition CMP into several regions 4

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 Introduction  NoC virtualization  Performance evaluation  Experimental results  Conclusions 7

 Partition CMP into several regions  Virtual-regions (VR) ◦ Traffic can not traverse other regions  Virtual-domains (VD) ◦ Message can cross the boundaries of the regions  Logic-Based Distributed Routing (LBDR) 8

Virtual-regions (VR) Virtual-domains (VD) 9

 2 sets of bits per output port ◦ 1 bit per port ： connection ◦ 2 bit per port ： routing 10

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 Introduction  NoC virtualization  Performance evaluation  Experimental results  Conclusions 12

 Simulation environment  System integration  CMP model  Workload  Scenarios 13

14 Simics-GEMS

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16  A processing element  A router  A private L1 cache  A shared L2 cache  A memory directory bank  A memory controller

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 PARSEC v2.1 benchmark 18

 Baseline scenarios  VR/VD scenarios ◦ Divided the CMP in four regions ◦ Each region has the same number of resources ◦ Each application is assigned to one region 19

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 Introduction  NoC virtualization  Performance evaluation  Experimental results  Conclusions 24

 Static  Applications start until the first application end (Blackscholes)  Each scenario with 3 different packet injection rates (PIR)  Performance metrics ◦ Execution time ◦ Network latency ◦ Network throughput ◦ Energy consumption ◦ Link utilization 25

26 a b c d 24% 18% 25%

27 Blackscholes, Swaptions, Streamcluster, Fluidanimate 4% 9% Applications set two

28 a b c d 29% 32% 33% 19%

29 a b c d 6% 8% 18%

30 a b c d 13% 10%

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 Introduction  NoC virtualization  Performance evaluation  Experimental results  Conclusions 35

 Improve the performance in CMP  Partition CMP into several regions to isolate the traffic of different applications  Dynamic assign resources is a question 36