Sanaz Azampanah Ahmad Khademzadeh Nader Bagherzadeh Majid Janidarmian Reza Shojaee
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1 Sanaz Azampanah Ahmad Khademzadeh Nader Bagherzadeh Majid Janidarmian Reza Shojaee
2 Application-Specific Routing Algorithm Selection Function Look-Ahead Traffic-aware Execution (LATEX) Algorithm Experimental Results 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 2
3 Application-Specific Routing Algorithm Selection Function Look-Ahead Traffic-aware Execution (LATEX) Algorithm Experimental Results 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 3
4 Information about Tasks which communicate and tasks which do never communicate After task mapping Information about network nodes which communicate Cuncurrent/non-cuncurrent communications Communication bandwidth requirements Many opportunities Improve performance(e.g., maximize routing adaptivity) Simplify the estimation/control of congestion Design more effective selection policies 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 4
5 Network Topology Core Graph of Application Specification Routing Algorithm Design 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 5
6 Application-Specific Routing Algorithm Selection Function Look-Ahead Traffic-aware Execution (LATEX) Algorithm Experimental Results 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 6
7 Determines the path that each packet follows between a sourcedestination pair Switching Deterministic Routing Function Topology NoC performance Routing Adaptive Routing Function Selection Function Flow control 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 7
8 Application-Specific Routing Algorithm Selection Function Look-Ahead Traffic-aware Execution (LATEX) Algorithm Experimental Results 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 8
9 Routing Function returns a set of admissible output channels Selection Function is used to select the output channel to which the packet will be forwarded 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 9
10 Application-Specific Routing Algorithm Selection Function Look-Ahead Traffic-aware Execution (LATEX) Algorithm Experimental Results 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 10
11 Probability of link selection (Psel) FreeBufferSlot InstantPower LATEX Selection Function Best Admissible Output 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 11
12 Offline Procedure Link Contention Equivalent Resistance Online Operation Requirements InstantPower FreeBufferSlot Probability of link selection (Psel) 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 12
13 Aggregate amount of traffic which can pass through a specified link based on the communications given in the communication graph C L = : a path for the desired communication : the set of all such possible paths : the traffic generated by the communication : the number of all communications specified in communication graph 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 13
14 Communication Graph of Multi Media System (MMS) 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 14
15 mapping mapping 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 15
16 Odd columns Column 0 Column 1 restrict some turns in locations SW & NW Even columns restrict some turns in locations ES & EN 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 16
17 Routing Function: Odd-Even 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 17
18 0->1 : >2 : >1 : >4 : >0 : 6->5 : >2 : >3 : >4 : >5 : >6 : >3 : >8 : >6 : >7 : >6 : >9 : >8 : >0 : >7 : >10 : >11 : >8 : >13 : >14 : >12 : >11 : >6 : >7 : >12 : >9 : >10 : >11 : >12 : >13 : >15 : >10 : >11 : >14 : >13 : >16 : >15 : >16 : >17 : >12 : >13 : >18 : >19 : 15->20 : >17 : >18 : >19 : >16 : >17 : >21 : >22 : >23 : >18 : >15 : >16 : >17 : >22 : >19 : >24 : >21 : >20 : >21 : >23 : >22 : >23 : >1: comm 0,16 + comm 0,1 0->1 : foreach Link in Topology Link.Contention = 0; foreach Comm in CommGraph { CurrentTraffic = Comm.TrafficLoad; PossiblePaths = RoutingFunction(Comm); foreach Path in PossiblePaths foreach Link in Path Link.Contention = Link.Contention + CurrentTraffic; } 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 18
19 Each node in our topology is considered as a circuit node Each link as a resistor with a magnitude equal to the link s contention 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 19
20 ER (South) ER (East) 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 20
21 Psel (Probability of selection) the selection probability of the direction having reverse relation to link s traffic The final values for Psel are stored at each router for specified source and destination pair 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 21
22 Free Buffer Slot[d] number of free buffer slots available at the input buffer of the adjacent neighbor along the direction dwhere dis one of (North, South, East, West) Instant Power the difference between power consumed by the router at instant and where tis the moment we want to select final output channel for a packet; 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 22
23 Probability of link selection (Psel) FreeBufferSlot B[d] InstantPower ( ) LATEX Selection Function Best Admissible Output th Euromicro International Conference on Parallel, Distributed and Network-based Processing 23
24 + + FreeBufferSlots normalized by MaxBufferSize Instant power consumption ( ) normalized by MaxInstantPower is already in span thus no need for normalization For example the best for odd-even routing under MMS traffic scenario: = 0.3 = 0.4 = th Euromicro International Conference on Parallel, Distributed and Network-based Processing 24
25 Application-Specific Routing Algorithm Selection Function Look-Ahead Traffic-aware Execution (LATEX) Algorithm Experimental Results 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 25
26 Evaluation Metrics Average delay ( ) The time that header flit injects into the network till the tail flit receives at destination node Max delay ( ) total number of packets : the delay of packet Power consumption total energy dissipated by router and links 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 26
27 Simulation Environment Simulation platform: Noxim Traffic scenarios MMS (5 5 mesh size) VOPD (4 4 mesh size) Architecture Buffers: 4 flits Packet size: 6 flits Simulationtime:100,000clockcycles (warm-upsession:10,000clock cycles) 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 27
28 Routing Functions Odd-Even(OE) West-First(WF) Negitive-First(NF) Selection Functions Random Bufferlevel NoP LATEX 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 28
29 Average Delay Odd-Even Routing MMS Application 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 29
30 Max Delay Odd-Even Routing MMS Application 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 30
31 Power Consumption Odd-Even Routing MMS Application 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 31
32 Application-Specific Routing Algorithm Selection Function Look-Ahead Traffic-aware Execution (LATEX) Algorithm Experimental Results 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 32
33 M. Janidarmian, A. Khademzadeh, A. Roshanfekr, V. Samadi, "A Methodology for Application- Specific Network-on-Chips Design," in International Journal of Computer Science, L. Schwiebert and R. Bell, "Performance Tuning of Adaptive Wormhole Routing through Selection Function Choice," Parallel and Distributed Computing, vol. 62, no. 7, pp , July R. D. Holsmark, S. Kumar, and V. Catania M. Palesi, "Application Specific Routing Algorithms for Networks on Chip," in IEEE Transactions on Parallel and Distributed Systems, vol. 20, no. 3, March 2009, pp V.Catania,M.Palesi,D.Patti G. Acsia, "Implementation and Analysis of a New Selection Strategy for Adaptive Routing in Networks-on-Chip," in IEEE Transactions on Computers, vol. 57, no. 6, June 2008, pp C. J. Glass and L. M. Ni, "The Turn Model for Adaptive Routing," ACM, vol. 41, no. 5, pp , Noxim: Network-on-Chip Simulator. [Online]. W. J. Dally and B. Towles, Principles and Practices of Interconnection Networks. San Francisco, CA: Morgan Kaufmann Publishers Inc, th Euromicro International Conference on Parallel, Distributed and Network-based Processing 33
34 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing 34
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