| 1. |
- Agelis, Sacki, et al.
(författare)
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Reconfigurable optical interconnection system supporting concurrent application-specific parallel computing
- 2005
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Ingår i: 17th Symposium on Computer Architecture and High Performance Computing. - Washington, DC, USA : IEEE Computer Society. - 076952446X ; , s. 44-51
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Konferensbidrag (refereegranskat)abstract
- Application specific architectures are highly desirable in embedded parallel computing systems at the same time as designers strive for using one embedded parallel computing platform for several applications. If this can be achieved, the cost can be decreased in comparison to using several different embedded parallel computing systems. This paper presents a novel approach of running several high-performance applications concurrently on one single parallel computing system. By using a reconfigurable backplane interconnection system, the applications can be run efficiently with high network flexibility since the interconnect network can be adapted to fit the application that is being processed for the moment. More precisely, this paper investigates how the space time adaptive processing (STAP) radar algorithm and the stripmap synthetic aperture radar (SAR) algorithm can be mapped on a multi-cluster processing system with a reconfigurable optical interconnection system realized by a micro-optical-electrical mechanical system (MOEMS) crossbars. The paper describes the reconfigurable platform, the two algorithms and how they individually can be mapped on the targeted multiprocessor system. It is also described how these two applications can be mapped simultaneously on the optical reconfigurable platform. Implications and requirements on communication bandwidth and processor performance in different critical points of the two applications are presented. The results of the analysis show that an implementation is feasible with today's MOEMS technology, and that the two applications can be successfully run in a time-sharing scheme, both at the processing side and at the access for interconnection bandwidth.
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| 2. |
- Böhm, Annette, 1975-, et al.
(författare)
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A Fibre-Optic AWG-Based Real-Time Network and Its Applicability to High-Performance Embedded Computing
- 2005
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Ingår i: 19th International Parallel and Distributed Processing Symposium. - Piscataway, N.J. : IEEE Press. - 0769523129 ; , s. 133b-133b
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Konferensbidrag (refereegranskat)abstract
- In this paper, an architecture and a Medium Access Control (MAC) protocol for a multi-wavelength optical communication network, applicable in short range communication systems like System Area Networks (SANs), are proposed. The main focus lies on guaranteed support for hard and soft real-time traffic. The network is based upon a single-hop star topology with an Arrayed Waveguide Grating (AWG) at its center. Traffic scheduling is centralized in one node (residing together with the AWG in a hub), which communicates through a physical control channel. The AWG's property of spatial wavelength reuse and the combination of fixed-tuned and tunable transceivers in the nodes enable simultaneous control and data transmission. A case study with defined real-time communication requirements in the field of Radar Signal Processing (RSP) was carried out and indicates that the proposed system is very suitable for this kind of application.
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| 3. |
- Böhm, Annette, et al.
(författare)
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AWG-based Optoelectronic Router with QoS Support
- 2005
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Ingår i: 2005 International Conference on Wireless and Optical Communications Networks. - Piscataway, NJ : IEEE Press. - 0780390199 ; , s. 23-28
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Konferensbidrag (refereegranskat)abstract
- We present a router architecture with electronic queuing and a passive optical multi-channel network, which is based upon a single-hop star topology with an arrayed waveguide grating (AWG) at its center. The AWG's property of spatial wavelength reuse and both fixed-tuned and tunable transceivers enable simultaneous control and data transmission. Our proposed medium access control protocol supports traffic differentiation and utilizes EOF (earliest deadline first) to schedule the traffic from input ports to output ports on the router. Our simulations show that the router treats QoS (quality of service) traffic well.
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| 4. |
- Fan, Xing, 1975-, et al.
(författare)
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Admission control for switched real-time Ethernet : scheduling analysis versus network calculus
- 2005
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Ingår i: Proc. of the Swedish National Computer Networking Workshop (SNCNW’05), Halmstad, Sweden, Nov. 23-24, 2005. ; , s. 4 s.-
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Konferensbidrag (refereegranskat)abstract
- Many approaches have been developed to give an estimation of the upper bound of the end-to-end delay or the response-time for real-time application, e.g., the Network Calculus (NC) model and the scheduling analysis. In this paper, we present an approach based on scheduling analysis to support guaranteed real-time services over standard switched Ethernet. Furthermore, we conduct a comparative study between these two admission control schemes, our novel algorithm and an NC-based algorithm. The simulation analysis shows that our feasibility analysis gives up to 50% higher utilization than the popular NC. Another advantage of our solution is that no additional hardware or software modification of the switch and the underlying standard. In our proposal, the traffic differentiation mechanism introduced by the IEEE 802.1D/Q standard and the standard hardware-implemented First Come First Served (FCFS) priority queuing are used in the switch and the source nodes. We have derived a feasibility analysis algorithm to ensure that the real-time requirements can be met. The algorithm also gives, as a sub-result, the needed buffer space in the end nodes and the switch. Moreover, our feasibility analysis supports variable-sized frames and switches with different bit-rates ports.
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| 5. |
- Fan, Xing, 1975-, et al.
(författare)
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Guaranteed real-time services over standard switched Ethernet
- 2005
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Ingår i: The IEEE Conference on Local Computer Networks, 30th Anniversary. - New York, NY : IEEE Computer Society. - 0769524214 ; , s. 490-492
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Konferensbidrag (refereegranskat)abstract
- In this paper, we contribute with an approach to support guaranteed real-time services over standard switched Ethernet without additional hardware or software modification of the switch and the underlying standard. In our proposal, the traffic differentiation mechanism introduced by the IEEE 802.1D/Q standard and the standard hardware-implemented first come first served (FCFS) priority queuing are used in the switch and the source nodes. We have derived a feasibility analysis algorithm that can be used to ensure that the real-time requirements can be met. The algorithm also gives, as a sub-result, the needed buffer space in the end nodes and the switch. Moreover, our feasibility analysis supports variable-sized frames and switches with different bit-rates ports. The simulation analysis verifies our feasibility analysis.
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| 6. |
- Kunert, Kristina, et al.
(författare)
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AWG-based optoelectronic router supporting both guaranteed and best-effort QoS traffic
- 2005
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Konferensbidrag (refereegranskat)abstract
- We present a router architecture with electronic queuing and a passive optical multi-channel network, based upon a single-hop star topology with an Arrayed Waveguide Grating (AWG) at its centre. The AWG’s property of spatial wavelength reuse and both fixed-tuned and tuneable transceivers enable simultaneous control and data transmission. Our proposed medium access control protocol supports traffic differentiation and utilizes EDF (Earliest Deadline First) to schedule the traffic from input ports to output ports on the router. Our simulations show that the router treats QoS (Quality of Service) traffic well.
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| 7. |
- Weckstén, Mattias, et al.
(författare)
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Derivation of implementation constraints - implementation simulation and treatment of multiple design choices
- 2005
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Ingår i: Proceedings. - Los Alamitos, Calif. : IEEE Computer Society. - 076952284X ; , s. 459-466
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Konferensbidrag (refereegranskat)abstract
- The industrial use of ad hoc implementation methods for non-functional constrained tasks has resulted in unnecessary expensive projects. In some cases, ad hoc methods result in overly many iterations to be made and in some severe cases, total project breakdown. To be able to solve these problems a method has been developed to derive end-to-end non-functional constraints, such as timing requirements, to task-level constraints and to promote this information to the implementation phase of the project. For a tool, as the one described above, to be really useful it is important to be able to show that there is a potential cost reduction to be made. To be able to show that a certain implementation method costs less in work hours than to use an ad hoc implementation method, a model for implementation simulation with support for multiple implementation alternatives has been developed. The experiments show that using the budget based implementation method leads to a significant cost reduction in most cases, compared to the ad hoc method. As far as we know, no similar experiments have been done to compare implementation methods.
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