| 1. |
- Jonsson, Magnus, 1969-, et al.
(författare)
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A fiber-optic interconnection concept for scaleable massively parallel computing
- 1995
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Ingår i: Proceedings of the Second International Conference on Massively Parallel Processing Using Optical Interconnections. - Piscataway, NJ. : IEEE. - 0818671017 ; , s. 313-320
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Konferensbidrag (refereegranskat)abstract
- One of the most important features of interconnection networks for massively parallel computer systems is scaleability. The fiber-optic network described in this paper uses both wavelength division multiplexing and a configurable ratio between optics and electronics to gain an architecture with good scaleability. The network connects distributed modules together to a huge parallel system where each node itself typically consists of parallel processing elements. The paper describes two different implementations of the star topology, one uses an electronic star and fiber optic connections, the other is purely optical with a passive optical star in the center. The medium access control of the communication concept is presented and some scaleability properties are discussed involving also a multiple-star topology.
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| 2. |
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| 3. |
- Jonsson, Magnus, 1969-
(författare)
-
Control-channel based fiber-ribbon pipeline ring network
- 1998
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Ingår i: Fifth International Conference on Massively Parallel Processing. - Piscataway, NJ. : IEEE. - 0818685727 ; , s. 158-165
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Konferensbidrag (refereegranskat)abstract
- In this paper, we propose a control-channel based ring network built up of fiber-ribbon point-to-point links. One of the fibers in each link forms part of the control-channel ring, over which medium access control information is sent immediately before data transmissions. This increases performance of the network. High throughputs can be achieved in the network due to pipelining, i.e., several packets can be traveling through the network simultaneously but in different segments of the ring. The network can meet high performance demands in, e.g., massively parallel signal processing systems, which is shown by example in the paper. Also, real-time demands can be met using slot reserving. The network, called CC-FPR (Control-Channel based Fiber-ribbon Pipeline Ring), can be built today using fiber-optic off-the-shelf components, and a prototype is currently under development. The increasingly good price/performance ratio for fiber-ribbon links indicates a great success potential for the proposed kind of network.
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| 4. |
- Jonsson, Magnus, 1969-, et al.
(författare)
-
Dynamic time-deterministic traffic in a fiber-optic WDM star network
- 1997
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Ingår i: Proceedings. - Piscataway, NJ. : IEEE Computer Society. - 0818680342 ; , s. 25-33
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Konferensbidrag (refereegranskat)abstract
- A number of protocols for WDM (Wavelength Division Multiplexing) star networks have been proposed. However, the area of real-time protocols for these networks is quite unexplored. In this paper, a real-time protocol, based on TDM (Time Division Multiplexing), for fiber-optic star networks is presented. By the use of WDM, multiple Gb/s channels are achieved. Services for both guarantee-seeking messages and best-effort messages are supported for single destination, multicast, and broadcast transmission. Slot reserving can be used to increase the time-deterministic bandwidth, while still having an efficient bandwidth utilization due to a simple slot release method. The deterministic properties of the protocol are analyzed and simulation results presented. © 1997 IEEE
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| 5. |
- Jonsson, Magnus, 1969-
(författare)
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Fiber-optic interconnection networks for signal processing applications
- 1999
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Ingår i: Parallel and distributed processing : 11th [sic] IPPS/SPDP '99 workshops held in conjunction with the 13th International Parallel Processing Symposium and 10th Symposium on Parallel and Distributed Processing, San Juan, Puerto Rico, USA, April 12-16, 1999 : proceedings. - London : Springer-Verlag. - 3540658319 ; , s. 1374-1385
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Konferensbidrag (refereegranskat)abstract
- In future parallel radar signal processing systems, with high bandwidth demands, new interconnection technologies are needed. The same reasoning can be made for other signal processing applications, e.g., those involving multimedia. Fiber-optic networks are a promising alternative and a lot of work have been done. In this paper, a number of fiber-optic interconnection architectures are reviewed, especially from a radar signal processing point-of-view. Two kinds of parallel algorithm mapping are discussed: (i) a chain of pipeline-stages mapped, more or less directly, one stage per computation node and (ii) SPMD (Same Program Multiple Data). Several network configurations, which are simplified due to the nature of the applications, are also proposed. © Springer-Verlag Berlin Heidelberg 1999
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| 6. |
- Jonsson, Magnus, 1969-
(författare)
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Fiber-Optic Interconnections in High-Performance Real-Time Computer Systems
- 1997
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Future parallel computer systems for embedded real-time applications,where each node in itself can be a parallel computer, are predicted to havevery high bandwidth demands on the interconnection network. Otherimportant properties are time-deterministic latency and guarantees to meetdeadlines. In this thesis, a fiber-optic passive optical star network with amedium access protocol for packet switched communication in distributedreal-time systems is proposed. By using WDM (Wavelength DivisionMultiplexing), multiple channels, each with a capacity of several Gb/s, areobtained. A number of protocols for WDM star networks have recently been proposed.However, the area of real-time protocols for these networks is quiteunexplored. The protocol proposed in this thesis is based on TDMA (TimeDivision Multiple Access) and uses a new distributed slot-allocationalgorithm with real-time properties. Services for both guarantee-seekingmessages and best-effort messages are supported for single destination,multicast, and broadcast transmission. Slot reserving can be used toincrease the time-deterministic bandwidth, while still having an efficientbandwidth utilization due to a simple slot release method. By connecting several clusters of the proposed WDM star network by abackbone star, thus forming a star-of-stars network, we get a modular andscalable high-bandwidth network. The deterministic properties of thenetwork are theoretically analyzed for both intra-cluster and inter-clustercommunication, and computer simulations of intra-cluster communicationare reported. Also, an overview of high-performance fiber-opticcommunication systems is presented.
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| 7. |
- Jonsson, Magnus, 1969-, et al.
(författare)
-
Fiber-ribbon pipeline ring network for high-performance distributed computing systems
- 1997
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Ingår i: Proceedings of the Third International Symposium on Parallel Architectures, Algorithms, and Networks, 1997. (I-SPAN '97). - : IEEE. ; , s. 138-143
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Konferensbidrag (refereegranskat)abstract
- In this paper, we propose a high-bandwidth ring network built up with fiber-ribbon point-to-point links. The network has support for both packet switched and circuit switched traffic. Very high throughputs can be achieved in the network due to pipelining, i.e., several packets can be traveling through the network simultaneously but in different segments of the ring. The network can be built today using fiber-optic off-the-shelf components. The increasingly good price/performance ratio for fiber-ribbon links indicates a great success potential for the proposed kind of networks. We also present a massively parallel radar signal processing system with exceptionally high demands on the communication network. An aggregated throughput of tens of Gb/s is needed in this application, and this is achieved with the proposed network.
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| 8. |
- Jonsson, Magnus, 1969-, et al.
(författare)
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Fiber-ribbon ring network with services for parallel processing and distributed real-time systems
- 1999
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Ingår i: <em>Proc. ISCA 12th International Conference on Parallel and Distributed Computing Systems (PDCS-99)</em>. - : ISCA. ; , s. 94-101, s. 46-54
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Konferensbidrag (refereegranskat)abstract
- In this paper, we present how real-time services are implemented in a control-channel based ring network built up of fiber-ribbon point-to-point links. Services for best effort messages, guarantee seeking messages and real-time virtual channels are supported for single destination, multicast and broadcast transmission by the network. Slot-reservation is used for the implementation of real-time virtual channels. High aggregated throughput can be achieved due to pipelining, i.e., data can be transmitted simultaneously in different segments of the ring. An analysis of worst-case latency and deterministic throughput, which are important measures for real-time service implementation, is provided. The network is analyzed for two variants of time-slot organization, one that offers higher throughput and one that offers lower latency in some situations. We also show how the network offers low-level support for parallel computing, i.e., barrier-synchronization and global reduction. The control channel is used when realizing these functions, which implies no modification of the original network architecture. Low-level support for reliable transmission is also offered in a similar manner. This includes acknowledge / negative acknowledge and flow-control.
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| 9. |
- Jonsson, Magnus, 1969-
(författare)
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High-performance fiber-optic communication networks for distributed computing systems
- 1997
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Interconnection networks have a key role in distributed processing systems of today but to follow the evolution in processing power, new technologies are needed. Multiple-channel fiber-optic communication can solve the emerging demand of bandwidth. New protocols must, however, be used to coordinate the use of multiple high-speed channels. This paper describes protocols and fiber-optic network architectures that are considered to be useful as flexible interconnection networks in future parallel and distributed computing systems. Also, a short overview of system components and system technologies is presented.
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| 10. |
- Jonsson, Magnus, 1969-
(författare)
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High performance fiber-optic interconnection networks for real-time computing systems
- 1999
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Parallel and distributed computing systems become more and more powerful and hence place increasingly higher demands on the networks that interconnect their processors or processing nodes. Many of the applications running on such systems, especially embedded systems applications, have real-time requirements and, with increasing application demands, high-performance networks are the hearts of these systems. Fiber-optic networks are good candidates for use in such systems in the future. This thesis contributes to the relatively unexplored area of fiber-optic networks for parallel and distributed real-time computer systems and suggests and evaluates several fiber-optic networks and protocols. Two different technologies are used in the networks, WDM (Wavelength Division Multiplexing) and fiber-ribbon point-to-point links. WDM offers multiple channels, each with a capacity of several Gbit/s. A WDM star network in which protocols and services are efficiently integrated to support different kinds of real-time demands, especially hard ones, has been developed. The star-of-stars topology can be chosen to offer better network scalability. The WDM star architecture is attractive but its future success depends on components becoming more commercially mature. Fiber-ribbon links, offering instead an aggregated bandwidth of several Gbit/s, have already reached the market with a promising price/performance ratio. This has motivated the development and investigation of two new ring networks based on fiber-ribbon links. The networks take advantage of spatial bandwidth reuse, which can greatly enhance performance in applications with a significant amount of nearest downstream neighbor communication. One of the ring networks is control channel based and not only has support for real-time services like the WDM star network but also low level support for, e.g., group communication. The approach has been to develop network protocols with support for dynamic real-time services, out of time-deterministic static TDMA systems. The focus has been on functionality more than pure performance figures, mostly on real-time features but also on other types of functionality for parallel and distributed systems. Worst-case analyses, some simulations, and case studies are reported for the networks. The focus has been on embedded supercomputer applications, where each node itself can be a parallel computer, and it is shown that the networks are well suited for use in the radar signal processing systems studied. Other application examples in which these kinds of networks are valuable are distributed multimedia systems, satellite imaging and other image processing applications.
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