Virtualizing NoC resources in chip-multiprocessors

Microprocessors and MicrosystemsVolume 35, Issue 2, March 2011, Pages 230–245

Special issue on Network-on-Chip Architectures and Design MethodologiesFrancisco Trivino, Jose L. Sanchez, Francisco J. Alfaro, Jose Flich

王健宇2012.10.24

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Introduction NoC virtualization Performance evaluation Experimental results Conclusions

Outline

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Introduction NoC virtualization Performance evaluation Experimental results Conclusions

Outline

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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

Introduction

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Introduction (cont.)

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Introduction (cont.)

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Introduction NoC virtualization Performance evaluation Experimental results Conclusions

Outline

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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)

NoC virtualization

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NoC virtualization (cont.)

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

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

Logic-Based Distributed Routing

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LBDR (cont.)

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Introduction NoC virtualization Performance evaluation Experimental results Conclusions

Outline

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Simulation environment System integration CMP model Workload Scenarios

Performance evaluation

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Simulation environmentSimics-GEMS

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System integration

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CMP model A processing element A router A private L1 cache A shared L2 cache A memory directory bank A memory controller

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CMP model (cont.)

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PARSEC v2.1 benchmark

Workload

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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

Scenarios

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Baseline scenarios

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VR scenarios

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VR scenarios (cont.)

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VD scenarios

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Introduction NoC virtualization Performance evaluation Experimental results Conclusions

Outline

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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

Experimental results

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Execution time

a

b

c

d

24%

18%

25%

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Execution time (cont.)

Blackscholes, Swaptions, Streamcluster, Fluidanimate

4%9%

Applications set two

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Network latency

a

b

c

d

29%

32%

33%

19%

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Network throughput

a

b

c

d

6%

8%18%

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Energy consumption

a

b

c

d

13%

10%

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Link utilization

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Link utilization (cont.)

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Link utilization (cont.)

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Link utilization (cont.)

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Introduction NoC virtualization Performance evaluation Experimental results Conclusions

Outline

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Improve the performance in CMP Partition CMP into several regions to isolate

the traffic of different applications Dynamic assign resources is a question

Conclusions