| 41. |
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| 42. |
- Eslami Kiasari, Abbas, et al.
(författare)
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A Framework for Designing Congestion-Aware Deterministic Routing
- 2010
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Ingår i: NoCArc '10 Proceedings of the Third International Workshop on Network on Chip Architectures. - New York, NY, USA : ACM. - 9781450303972 ; , s. 45-50
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Konferensbidrag (refereegranskat)abstract
- In this paper, we present a system-level Congestion-Aware Routing (CAR) framework for designing minimal deterministic routing algorithms. CAR exploits the peculiarities of the application workload to spread the load evenly across the network. To this end, we first formulate an optimization problem of minimizing the level of congestion in the network and then use the simulated annealing heuristic to solve this problem. The proposed framework assures deadlock-free routing, even in the networks without virtual channels. Experiments with both synthetic and realistic workloads show the effectiveness of the CAR framework. Results show that maximum sustainable throughput of the network is improved by up to 205% for different applications and architectures.
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| 43. |
- Eslami Kiasari, Abbas, et al.
(författare)
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A Heuristic Framework for Designing and Exploring Deterministic Routing Algorithm for NoCs
- 2013
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Ingår i: Algorithms in Networks-on-Chip. - New York, NY : Springer. - 9781461482734 ; , s. 21-39
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Bokkapitel (refereegranskat)abstract
- In this chapter, we present a system-level framework for designing minimal deterministic routing algorithms for Networks-on-Chip (NoCs) that are customized for a set of applications. To this end, we first formulate an optimization problem of minimizing average packet latency in the network and then use the simulated annealing heuristic to solve this problem. To estimate the average packet latency we use a queueing-based analytical model which can capture the burstiness of the traffic. The proposed framework does not require virtual channels to guarantee deadlock freedom since routes are extracted from an acyclic channel dependency graph. Experiments with both synthetic and realistic workloads show the effectiveness of the approach. Results show that maximum sustainable throughput of the network is improved for different applications and architectures.
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| 44. |
- Eslami Kiasari, Abbas, et al.
(författare)
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An Analytical Latency Model for Networks-on-Chip
- 2013
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Ingår i: IEEE Transactions on Very Large Scale Integration (vlsi) Systems. - 1063-8210 .- 1557-9999. ; 21:1, s. 113-123
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Tidskriftsartikel (refereegranskat)abstract
- We propose an analytical model based on queueing theory for delay analysis in a wormhole-switched network-on-chip (NoC). The proposed model takes as input an application communication graph, a topology graph, a mapping vector, and a routing matrix, and estimates average packet latency and router blocking time. It works for arbitrary network topology with deterministic routing under arbitrary traffic patterns. This model can estimate per-flow average latency accurately and quickly, thus enabling fast design space exploration of various design parameters in NoC designs. Experimental results show that the proposed analytical model can predict the average packet latency more than four orders of magnitude faster than an accurate simulation, while the computation error is less than 10% in non-saturated networks for different system-on-chip platforms.
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| 45. |
- Eslami Kiasari, Abbas, et al.
(författare)
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Analytical approaches for performance evaluation of networks-on-chip
- 2012
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Ingår i: CASES'12 - Proceedings of the 2012 ACM International Conference on Compilers, Architectures and Synthesis for Embedded Systems, Co-located with ESWEEK. - New York, NY, USA : ACM. - 9781450314244 ; , s. 211-212
-
Konferensbidrag (refereegranskat)abstract
- This tutorial reviews four popular mathematical formalisms - dataflow analysis, schedulability analysis, network calculus, and queueing theory - and how they have been applied to the analysis of Network-on-Chip (NoC) performance. We review the basic concepts and results of each formalism and provide examples of how they have been used in on-chip communication performance analysis. The tutorial also discusses the respective strengths and weaknesses of each formalism, their suitability for a specific purpose, and the attempts that have been made to bridge these analytical approaches. Finally, we conclude the tutorial by discussing open research issues.
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| 46. |
- Eslami Kiasari, Abbas, et al.
(författare)
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Mathematical formalisms for performance evaluation of networks-on-chip
- 2013
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Ingår i: ACM Computing Surveys. - : Association for Computing Machinery (ACM). - 0360-0300 .- 1557-7341. ; 45:3, s. 38-
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Tidskriftsartikel (refereegranskat)abstract
- This article reviews four popular mathematical formalisms-queueing theory, network calculus, schedulability analysis, anddataflow analysis-and how they have been applied to the analysis of on-chip communication performance in Systems-on-Chip. The article discusses the basic concepts and results of each formalism and provides examples of how they have been used in Networks-on-Chip (NoCs) performance analysis. Also, the respective strengths and weaknesses of each technique and its suitability for a specific purpose are investigated. An open research issue is a unified analytical model for a comprehensive performance evaluation of NoCs. To this end, this article reviews the attempts that have been made to bridge these formalisms.
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| 47. |
- Feng, Chaochao, et al.
(författare)
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A 1-Cycle 1.25 GHz Bufferless Router for 3D Network-on-Chip
- 2012
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Ingår i: IEICE transactions on information and systems. - 0916-8532 .- 1745-1361. ; E95D:5, s. 1519-1522
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we propose a 1-cycle high-performance 3D bufferless router with a 3-stage permutation network. The proposed router utilizes the 3-stage permutation network instead of the serialized switch allocator and 7 x 7 crossbar to achieve the frequency of 1.25 GHz in TSMC 65 nm technology. Compared with the other two 3D bufferless routers, the proposed router occupies less area and consumes less power consumption. Simulation results under both synthetic and application workloads illustrate that the proposed router achieves less average packet latency than the other two 3D bufferless routers.
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| 48. |
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| 49. |
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| 50. |
- Feng, C., et al.
(författare)
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Addressing transient and permanent faults in NoC with efficient fault-tolerant deflection router
- 2013
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Ingår i: IEEE Transactions on Very Large Scale Integration (vlsi) Systems. - 1063-8210 .- 1557-9999. ; 21:6, s. 1053-1066
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Tidskriftsartikel (refereegranskat)abstract
- Continuing decrease in the feature size of integrated circuits leads to increases in susceptibility to transient and permanent faults. This paper proposes a fault-tolerant solution for a bufferless network-on-chip, including an on-line fault-diagnosis mechanism to detect both transient and permanent faults, a hybrid automatic repeat request, and forward error correction link-level error control scheme to handle transient faults and a reinforcement-learning-based fault-tolerant deflection routing (FTDR) algorithm to tolerate permanent faults without deadlock and livelock. A hierarchical-routing-table-based algorithm (FTDR-H) is also presented to reduce the area overhead of the FTDR router. Synthesized results show that, compared with the FTDR router, the FTDR-H router can reduce the area by 27% in an 8×8 network. Simulation results demonstrate that under synthetic workloads, in the presence of permanent link faults, the throughput of an 8×8 network with FTDR and FTDR-H algorithms are 14% and 23% higher on average than that with the fault-on-neighbor (FoN) aware deflection routing algorithm and the cost-based deflection routing algorithm, respectively. Under real application workloads, the FTDR-H algorithm achieves 20% less hop counts on average than that of the FoN algorithm. For transient faults, the performance of the FTDR router can achieve graceful degradation even at a high fault rate. We also implement the fault-tolerant deflection router which can achieve 400 MHz in TSMC 65-nm technology.
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