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2008 Workshop on Many-Task Computing on Grids and Supercomputers, MTAGS 2008

作者： Hui, Li Huashan, Yu Xiaoming, Li Shenzhen Graduate School of Peking University Shenzhen Guangdong 518055 P.R. China Institute of Network Computing and Distributed System Peking University Beijing 100871 P.R. China State Key Laboratory of Advanced Optical Communication and Network Peking University Beijing 100871 P.R. China

ISBN: (纸本)9781424428724

This paper presents a lightweight framework for executing many independent tasks efficiently on grids of heterogeneous computational nodes. It dynamically groups tasks of different granularities and dispatches the groups onto distributed computational resources concurrently. Three strategies have been devised to improve the efficiency of computation and resource utilization. One strategy is to pack up to thousands of tasks into one request. Another is to share the effort in resource discovery and allocation among requests by separating resource allocations from request submissions. The third strategy is to pack variable numbers of tasks into different requests, where the task number is a function of the destination resource's computability. This framework has been implemented in Gracie, a computational grid software platform developed by Peking University, and used for executing bioinformatics tasks. We describe its architecture, evaluate its strategies, and compare its performance with GRAM. Analyzing the experiment results, we found that Gracie outperforms GRAM significantly for execution of sets of small tasks, which is aligned with the intuitive advantage of our approaches built in Gracie.

关键词： Resource management Distributed computing Grid computing Bioinformatics Processor scheduling Computer networks optical computing Supercomputers Parallel processing lab.ratories

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Simultaneous transmission of high-speed point-to-point data and double broadcast services in a WDM-PON system with source-free ONUs

Simultaneous transmission of high-speed point-to-point data ...

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optical Transmission, Switching, and Subsystems VI

作者： Chang, Qingjiang Huang, Mingfang Su, Yikai State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Electrical and Computer Engineering Georgia Institute of Technology GA 30332 United States

We propose that double broadcast services can be overlaid over high-speed point-to-point downlink data in a WDM-PON with source-free optical network units (ONUs). In the optical line terminal (OLT), a set of single-drive MachZehnder modulators (MZMs) are driven by downlink point-to-point data to generate a differential phase-shift keying (DPSK) format. The downlink DPSK signals from different wavelengths are multiplexed and then fed to a following dual-parallel MZM (DPMZM) as a double broadcast services transmitter. The broadcast service-l is an optical carrier suppression (OCS) format, while the broadcast service-2 is an inverse return-to-zero (IRZ) forma. After the transmission, at each ONU, the optical signals are separated by an optical filter. The filtered OCS signal is detected to retrieve the broadcast service-1. The DPSK/IRZ signals are split into three parts, one part is detected by an IRZ receiver to recover the broadcast service-2, the second part is detected by a DPSK receiver to retrieve the downlink data and the third part is re-modulated by the upstream amplitude shift keying (ASK). We also perform an experiment to verify the feasibility of the proposed scheme, where the power penalties of less than 1.5 dB are obtained after 25-km transmission with 1.25-Gb/s data rate. © 2008 SPIE.

关键词： Digital storage

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Task scheduling and lightpath establishment in optical grids

Task scheduling and lightpath establishment in optical grids

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INFOCOM 2008: 27th IEEE communications Society Conference on Computer communications

作者： Liu, Xin Wei, Wei Qiao, Chunming Wang, Ting Hu, Weisheng Guo, Wei Wu, Min-You Department of Computer Science and Engineering SUNY Buffalo NY 14260 United States NEC Laboratories America Princeton NJ 08540 United States State Key Lab. of Advanced Optical Communication Systems and Networks SJTU Shanghai 200030 China

ISBN: (纸本)9781424420261

Data-intensive Grid applications require huge data transferring between multiple geographically separated computing nodes where computing tasks are executed. For a future WDM network to efficiently support this type of emerging applications, traditional approaches to establishing lightpaths between given source destination pairs are not sufficient because a computing task may be executed on any one of several computing nodes having the necessary resources. Therefore, lightpath establishment has to be considered jointly with task scheduling to achieve best performance. In this paper, we study the optimization problems of jointly scheduling both computing resources and network resources. We first present the formulation of two optimization problems with the objectives being the minimization of the completion time of a job and minimization of the resource usage/cost to satisfy a job with a deadline respectively. When the objective is to minimize the completion time, we devise an optimal algorithm for a special type of applications. Furthermore, we propose efficient heuristics to deal with general applications with either optimization objective and demonstrate their good performances via simulation. © 2008 IEEE.

关键词： Optimization

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Filamentation control in temperature distributed argon gas filled tube

Filamentation control in temperature distributed argon gas f...

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International Conference on Ultrahigh Intensity Lasers Development,Science and Emerging Applications(第三届超强激光科学和应用国际会议)

作者： Shiying Cao Ruxin Li Zhong Wang Zhigang Zhang Zhenming Song Yu Qin Weipeng Kong Dongqing Pang Xiaowei Chen Liwei Song Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsCh Ultra fast Laser Laboratory School of Precision Instrument and Optoelectronics Engineering Key Lab

We presented a novel technique of controlling filamentation with temperature and conducted the experiment in the temperature gradient gas-filled tube by heating the entrance of the gas with a furnace and cooling the exit of the tube with *** experiment results show that multiple filaments can be merged into single filament by only increasing the local temperature at the beginning of the *** technique offers another degree of freedom of controlling the filamentation and opens a new way for multi-mJ level few-to-monocycle pulse generation through filamentation in rare gases.

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Reliability and real-time assurance of fly-by-light network for flight control system

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Guangxue Xuebao/Acta Optica Sinica 2008年第SUPPL. 2期28卷 196-200页

作者： Luo, Jiarong Luo, Xuan He, Hao Jin, Yaohui Huang, Haoyi Wu, Jianmin State Key Laboratory on Fiber-Optic Local Area Network and Advanced Optical Communication Systems Shanghai Jiaotong University Shanghai 200240 China National Defense Science and Technology Key Laboratory for Avionics System Integration Technology Shanghai 200233 China

A survey is made on several traditional topologies of fly-by-light(FBL) network. Based on the comparison of their reliability and real-time performance, a mesh optical switching network topology with 256 nodes is chosen. The redundancy topology gives the ability to sustain 3 link faults, which assures the reliability of network. The seriousness of the network failure can be measured by the number of link faults. And when several link faults occur at the same time, it must also be measured by the contiguity degree among the faults. A simulation is taken to test the end-to-end latency under all network failure situations. The simulation results show that even when some serious fault occurs, the number of hops of the end-to-end route increases slightly. So it still meets the real-time communication requirements.

关键词： Flight control systems

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Architecture and performance of a bidirectional OXC based on reversible optical switches with reduced complexity 33

Architecture and performance of a bidirectional OXC based on...

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2007 33rd European Conference and Exhibition of optical communication, ECOC 2007

作者： Qi, Yongmin Hu, Weisheng Dong, Yi Zhong, Wen-De Xu, Xinyu He, Hao Jin, Yaohui Guo, Wei Sun, Weiqiang Xiao, Shilin Su, Yikai State Key Lab. of Advanced Optical Communication System and Network Shanghai JiaoTong University Shanghai200240 China Network Technology Research Centre Nanyang Technological University Singapore639798 Singapore

By exploiting the symmetry of bidirectional wavelength-connections in WDM networks, we propose an NxN bidirectional OXC using one N/2xN/2 reversible optical switch to reduce the complexity of the OXCs. The feasibility... 详细信息

ISBN: (纸本)9783800730421

关键词： optical switches

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IP over optical multicasting for large-scale video delivery

IP over optical multicasting for large-scale video delivery

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network Architectures, Management, and Applications V

作者： Jin, Yaohui Hu, Weisheng Sun, Weiqiang Guo, Wei State Key Laboratory on Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai 200240 China

ISBN: (纸本)9780819469472

In the IPTV systems, multicasting will play a crucial role in the delivery of high-quality video services, which can significantly improve bandwidth efficiency. However, the scalab.lity and the signal quality of current IPTV can barely compete with the existing broadcast digital TV systems since it is difficult to implement large-scale multicasting with end-to-end guaranteed quality of service (QoS) in packet-switched IP network. China 3TNet project aimed to build a high performance broadband trial network to support large-scale concurrent streaming media and interactive multimedia services. The innovative idea of 3TNet is that an automatic switched optical networks (ASON) with the capability of dynamic point-to-multipoint (P2MP) connections replaces the conventional IP multicasting network in the transport core, while the edge remains an IP multicasting network. In this paper, we will introduce the network architecture and discuss challenges in such IP over optical multicasting for video delivery.

关键词： Multicasting

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A shared sub-path protection strategy in multi-domain optical networks

A shared sub-path protection strategy in multi-domain optica...

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2007 Asia optical Fiber communication and Optoelectronic Exposition and Conference, AOE

作者： Xuejuan, Xie Weiqiang, Sun Weisheng, Hu Jun, Wang State Key Lab. of Advanced Optical Communication System and Networks Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China

ISBN: (纸本)0978921739

In this paper, a shared sub-path protection mechanism for multi-domain optical networks is proposed. It divides the computed working path into several working sub-paths which span two domains. For each working sub-path, two intra-domain and an inter-domain backup sub-paths are computed to protect intra-domain and inter-domain failures. Simulation results show it has shorter failure recovery time and is resource efficient.

关键词： Fiber optic networks

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A radio over fiber system for simultaneous generation and transmission of multiband signals 33

A radio over fiber system for simultaneous generation and tr...

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2007 33rd European Conference and Exhibition of optical communication, ECOC 2007

作者： Chang, Qingjiang Su, Yikai State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai JiaoTong University Shanghai200240 China

We propose and experimentaly demonstrate a novel RoF system for simultaneous generation and transmission of baseband, micro-wave and millimeter-wave signals with a single wavelength using a dual-parallel Mach-Zehnder ... 详细信息

ISBN: (纸本)9783800730421

关键词： Light modulators

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A PON system providing triple play service based on a single dual-parallel Mach-Zehnder modulator 33

A PON system providing triple play service based on a single...

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2007 33rd European Conference and Exhibition of optical communication, ECOC 2007

作者： Chang, Qingjiang Tian, Yue Yan, Cishuo Xu, Xinyu Gao, Junming Su, Yikai State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai JiaoTong University Shanghai200240 China

We propose and experimentally demonstrate a novel PON system providing triple play service with centralized light source using a single dual-parallel Mach-Zehnder modulator. Upstream data re-modulation based on downst... 详细信息

ISBN: (纸本)9783800730421

关键词： Light sources

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