Presentation on theme: "TENCON’2012 (PROM3D) Parameterized Path-Based, Randomized, Oblivious, Minimal Routing in 3D Mesh NoC Dr. Mushtaq Ahmed Email : email@example.com Good."— Presentation transcript:
1 TENCON’2012(PROM3D) Parameterized Path-Based, Randomized, Oblivious, Minimal Routing in 3D Mesh NoCDr. Mushtaq AhmedGood morning to the session chair and delegates.This is my pleasure to present our work on Parameterized Path-Based, Randomized, Oblivious, Minimal Routing in 3D Mesh NoCCo-author : Rakesh kumarDepartment f Computer EngineeringMalaviya National Institute of Technology, Jaipur India
2 Presentation layout Network on Chip Adaptive Routing for Multiport 3D Mesh NoCPROM3D Routing for 3D NoCExperimental setupResultsConclusions
3 Why Network on Chip ? Transistor scaling is increased Millions of gatesMulticore architectureConventional bus techniques is not suitableRequire better approach i.e. Network on ChipTilera :TILE-Gx100 ™, 100 tilesMESH, freq 1.5GHz 45x45mm
4 Network on ChipNetwork-on-a-Chip (NoC) is a new paradigm for System-on-Chip (SoC) designNoC consist of:Processing Elements (PE)An architecture or topologyNumber of SwitchesNetwork InterfacesRouting technique with anaddressing systemCommunication Protocol formessage passing
5 NoC Architectures ■ Variants of NoC architecture TorusSpidergonMeshHoneycombHexagonal 2D Mesh3D Mesh■ Variants of NoC architecture- Torus, Mesh, Spidergom, honeycomb, diagonalised, HexagonUsability depend on application and performance requirementProper configuration is required for simulation.■ Routing technique and performance capability:-Can vary among topology- Target is optimization of efficiencythroughput, latency, area, gitter, power
7 Routing in NoC Provide the path from source to destination Two broad categoriesDeterministic and AdaptiveDeterministic routing generated packets P from a source node S always uses uniquely determined path for bound between source and destination pair ( XYZ routing)Partial adaptive routing is flexible and allows to choose multiple nodes for exploring the different route for the packets generated form source destined towards reciver ( West South First, North Up Last, Negative First)
8 XYZ RoutingRoute a packet in rows first, then moves along the columns and then move along the slices toward destination
9 Negative First Route a packet first adaptively west, south, and down and then adaptively east, north, and up.
10 West South First Route a packet first adaptively west and south and then adaptively down, east, north, and up.
11 North Up Last Route a packet first adaptively west, south, down, and east and then adaptively north and up.
12 PROM 3D Routing The f parameter is required in parameterized PROM 3D Let ∆x = |Dx – Cx|, ∆ y = |Dy – Cy| and ∆ z = |Dz – Cz|Minimum rectangle is(∆ x +1)(∆ y +1) (∆ z +1)Overall rectangle size will beNum(rows) xNum(cols) xNum(slices).
13 PROM 3D Routing Rules First, boundary regions are defined Parameter f (max) is selected.Packets are pushed toward intermediary nodes using priority functions.
14 PROM 3D Routing: Example Let 4*4*4 Mesh and f max =1Source S1(1; 1; 1) and Destination D1(3; 3; 3)f = 1* (3*3*3)/(4*4*4) = 0.42Source node Probabilities areP1= (2+0.42)/ ( )P2= (2+0.42)/ ( )P3= (2+0.42)/ ( )P1= 0.33, P2= 0.33 and P3=0.33Let us assume moves in x- direction at intermediate node (2; 1; 1) where, x=1, y=2 and z=2
15 PROM 3D Routing: Example At intermediate node (2; 1; 1)P1= (1+0.42)/ ( )P2= 2/ ( )P3= 2/ ( )P1= 0.22, P2= 0.31 and P3=0.31Here, P2 = P3 and (P2, P3 > P1).any path among P2 or P3 can be chosen.Let it is y-ingress, i.e., y direction for intermediate node (2; 2; 1) whereP1=0.19, P2=0.26 and P3=0.38Path from node (2; 2; 1) to node (2; 2; 2) will be selected
16 PROM 3D Routing: Example At intermediate node (2; 2; 2) P1=0.23, P2=0.23 and P3=0.33. Here, P3 is higher and (P3 > P1,P2). Path from (2; 2; 2) to node (2; 2; 3) is selected. Again probability at node (2; 2; 3) is to be calculated as P1=0.30, P2=0.30 and P3=0.12 where, P1 = P2 and (P1, P2 > P3). At intermediate node (3; 2; 3) P1=0.18, P2=0.44 and P3=0. P2 is highest and path from node (3; 2; 3) to node (3; 3; 3) is selected.
17 PROM 3D Routing: Example Parameters usedValuesMesh Size4 * 4 * 4Packet size20Buffer size8Flit size4Virtual channels2Simulation cycles10000Test gen. number2000Traffic patternsRandom and TransposePacket injectionBursty Data withBurst length 4 and interval of 3Load in %5 to 50 with 5% increasing stepsNo. of simulations10 times for each routing algo. With different load and traffic pattern
18 Simulation ResultsLatency under different values of fmax for random traffic with Bursty data.
19 Simulation ResultsLatency under different values of fmax for Transpose traffic with Bursty data.
20 Simulation ResultsLatency of XYZ, NUL, WSF, NF and PROM3D under Random traffic with Bursty data.
21 Simulation ResultsLatency of XYZ, NUL, WSF, NF and PROM3D under Transpose traffic with Bursty data.
22 ConclusionsResults are reasonable and comparable to existing DOR routing and turn model routing algorithms, as it always tries to explore minimal path.Parameterized PROM3D routing can handle congestion andperforms better when fmax parameter is chosen wisely.With the higher percentage of offered load, average latency in PROM3D under random and transpose traffic is observed better, i.e., lower than other routing algorithms, as it tries to follow allowable turns within cuboid of region of interest.
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