The Experts below are selected from a list of 22578 Experts worldwide ranked by ideXlab platform
Makoto Imase - One of the best experts on this subject based on the ideXlab platform.
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Performance Evaluation of Data Transfer Protocol GridFTP for Grid Computing
World Academy of Science Engineering and Technology International Journal of Computer Electrical Automation Control and Information Engineering, 2008Co-Authors: Hiroyuki Ohsaki, Makoto ImaseAbstract:In Grid computing, a Data Transfer Protocol called GridFTP has been widely used for efficiently Transferring a large volume of Data. Currently, two versions of GridFTP Protocols, GridFTP version 1 (GridFTP v1) and GridFTP version 2 (GridFTP v2), have been proposed in the GGF. GridFTP v2 supports several advanced features such as Data streaming, dynamic resource allocation, and checksum Transfer, by defining a Transfer mode called X-block mode. However, in the literature, effectiveness of GridFTP v2 has not been fully investigated. In this paper, we therefore quantitatively evaluate performance of GridFTP v1 and GridFTP v2 using mathematical analysis and simulation experiments. We reveal the performance limitation of GridFTP v1, and quantitatively show effectiveness of GridFTP v2. Through several numerical examples, we show that by utilizing the Data streaming feature, the average file Transfer time of GridFTP v2 is significantly smaller than that of GridFTP v1. Keywords— Grid Computing, GridFTP, Performance Evaluation, Queuing Theory.
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On Parameter Tuning of Data Transfer Protocol GridFTP for Wide-Area Networks
2008Co-Authors: T Ito, Hiroyuki Ohsaki, Makoto ImaseAbstract:In wide-area Grid computing, geographically distributed computational resources are connected for enabling efficient and large-scale scientific/engineering computations. In the wide-area Grid computing, a Data Transfer Protocol called GridFTP has been commonly used for large file Transfers. GridFTP has the following features for solving problems of the existing TCP. First, for accelerating the start-up in TCP’s slow start phase and achieving high throughput in TCP’s congestion avoidance phase, multiple TCP connections can be established in parallel. Second, according to the bandwidth-delay product of a network, the TCP socket buffer size can be negotiated between GridFTP server and client. However, in the literature, sufficient investigation has not been performed either on the optimal number of TCP connections or the optimal TCP socket buffer size. In this paper, we therefore quantitatively investigate the optimal parameter configuration of GridFTP in terms of the number of TCP connections and the TCP socket buffer size. We first derive performance metrics of GridFTP in steady state (i.e., goodput and packet loss probability). We then derive the optimal parameter configuration for GridFTP and quantitatively show performance limitations of GridFTP through several numerical examples. We also demonstrate validity of our approximate analysis by comparing simulation results with analytic ones. Keywords—Grid Computing, GridFTP, TCP (Transmission Control Protocol), Parameter Tuning, Steady State Analysis, Parallel TCP Connection, TCP Socket Buffer
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gridftp apt automatic parallelism tuning mechanism for Data Transfer Protocol gridftp
Cluster Computing and the Grid, 2006Co-Authors: T Ito, Hiroyuki Ohsaki, Makoto ImaseAbstract:GridFTP has been used as a Data Transfer Protocol to effectively Transfer a large volume of Data in grid computing. GridFTP supports a feature called parallel Data Transfer that improves throughput by establishing multiple TCP connections in parallel. However, for achieving high GridFTP throughput, the number of TCP connections should be optimized based on the network status. In this paper, we propose an automatic parallelism tuning mechanism called GridFTP-APT (GridFTP with automatic parallelism tuning) that adjusts the number of parallel TCP connections only using information measurable in the grid middleware. Through simulation experiments, we demonstrate that GridFTP-APT significantly improves the performance of GridFTP in various network environments.
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automatic parameter configuration mechanism for Data Transfer Protocol gridftp
Symposium on Applications and the Internet, 2006Co-Authors: T Ito, Hiroyuki Ohsaki, Makoto ImaseAbstract:In this paper, we propose an automatic parameter configuration mechanism for GridFTP, which optimizes the number of parallel TCP connections by utilizing analytic results in the work of Ito et al. (2005). The proposed mechanism first measures the network status (e.g., the goodput and the round-trip time of GridFTP Data channels) at the GridFTP client. Based on these measurement results, it adjusts the number of parallel TCP connections for maximizing the GridFTP goodput. Three operational modes, MI (multiplicative increase), MI+ (multiplicative increase plus), and AIMD (additive increase and multiplicative decrease) are proposed in this paper, each of which takes a different strategy for adjusting the number of parallel TCP connections. We evaluate performance of the proposed automatic parameter configuration mechanism through simulation experiments. We demonstrate that the proposed automatic parameter configuration mechanism significantly improves the performance of GridFTP.
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CCGRID - GridFTP-APT: automatic parallelism tuning mechanism for Data Transfer Protocol GridFTP
Sixth IEEE International Symposium on Cluster Computing and the Grid (CCGRID'06), 2006Co-Authors: T Ito, Hiroyuki Ohsaki, Makoto ImaseAbstract:GridFTP has been used as a Data Transfer Protocol to effectively Transfer a large volume of Data in grid computing. GridFTP supports a feature called parallel Data Transfer that improves throughput by establishing multiple TCP connections in parallel. However, for achieving high GridFTP throughput, the number of TCP connections should be optimized based on the network status. In this paper, we propose an automatic parallelism tuning mechanism called GridFTP-APT (GridFTP with automatic parallelism tuning) that adjusts the number of parallel TCP connections only using information measurable in the grid middleware. Through simulation experiments, we demonstrate that GridFTP-APT significantly improves the performance of GridFTP in various network environments.
Mooi Choo Chuah - One of the best experts on this subject based on the ideXlab platform.
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Performance study of robust Data Transfer Protocol for VANETs
Lecture Notes in Computer Science, 2006Co-Authors: Mooi Choo ChuahAbstract:Vehicular Ad-hoc Networks (VANETs) have emerged as a new network environment for intelligent transportation systems. In this paper, we focus on traffic monitoring (TM) and roadside message Transfer (RMT) applications. The TM application (TMA) allows drivers to query traffic conditions at some distance ahead of themselves so that they can make decisions on route changes. The RMT application (RMTA) allows Data messages to be delivered between roadside entities e.g. emergency messages, via the moving vehicles. We design a robust Data Transfer Protocol (RDTP), and evaluate its effectiveness on the two applications with various vehicular density and vehicular speed. Our study shows that our Protocol achieves comparably accurate speed estimate and higher query success rate with lower control overhead than VITP, an existing Protocol designed for TMA. It also achieves higher Data throughput and lower delivery latency than another existing approach for RMTA.
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MSN - Performance Study of Robust Data Transfer Protocol for VANETs
Lecture Notes in Computer Science, 2006Co-Authors: Mooi Choo ChuahAbstract:Vehicular Ad-hoc Networks (VANETs) have emerged as a new network environment for intelligent transportation systems. In this paper, we focus on traffic monitoring (TM) and roadside message Transfer (RMT) applications. The TM application (TMA) allows drivers to query traffic conditions at some distance ahead of themselves so that they can make decisions on route changes. The RMT application (RMTA) allows Data messages to be delivered between roadside entities e.g. emergency messages, via the moving vehicles. We design a robust Data Transfer Protocol (RDTP), and evaluate its effectiveness on the two applications with various vehicular density and vehicular speed. Our study shows that our Protocol achieves comparably accurate speed estimate and higher query success rate with lower control overhead than VITP, an existing Protocol designed for TMA. It also achieves higher Data throughput and lower delivery latency than another existing approach for RMTA.
Khalil Najafi - One of the best experts on this subject based on the ideXlab platform.
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ISCAS (5) - A high-rate frequency shift keying demodulator chip for wireless biomedical implants
Proceedings of the 2003 International Symposium on Circuits and Systems 2003. ISCAS '03., 2003Co-Authors: Maysam Ghovanloo, Khalil NajafiAbstract:A high-rate frequency shift keying (FSK) Data Transfer Protocol and demodulator circuit has been developed with a Data-rate to carrier-frequency ratio up to 67%. Its primary application is in the wireless biomedical implants in need of Data Transfer rates above 1 Mbps. The demodulator circuit extracts the serial Data bit stream and a constant-frequency clock from an FSK carrier signal in the 2/spl sim/20 MHz range, which is used to power the implant through inductive coupling. The chip occupies 0.41 mm/sup 2/ in the AMI 1.5 /spl mu/m 2M/2P standard CMOS process and has a simulated Data-rate of up to 2 Mbps and a measured rate of 200 Kbps while consuming less than 0.5 mW.
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A high Data Transfer rate frequency shift keying demodulator chip for the wireless biomedical implants
The 2002 45th Midwest Symposium on Circuits and Systems 2002. MWSCAS-2002., 2002Co-Authors: Maysam Ghovanloo, Khalil NajafiAbstract:This paper describes a high-rate frequency shift keying (FSK) Data Transfer Protocol and demodulator circuit for wireless operated biomedical implants in need of Data Transfer rates above 1 Mbit/sec. The demodulator circuit receives the serial Data bit stream from an FSK carrier signal in the 2/spl sim/20 MHz range, which is used to power the implant through inductive coupling. The circuitry has been designed and fabricated in the University of Michigan's single metal, dual-poly 3 /spl mu/m CMOS process and has been tested fully functional.
Thomas A. Defanti - One of the best experts on this subject based on the ideXlab platform.
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CSTP: A parallel Data Transfer Protocol using cross-stream coding
Future Generation Computer Systems, 2011Co-Authors: Shaofeng Liu, Jürgen P. Schulze, Thomas A. DefantiAbstract:Transferring very high quality digital objects over optical networks is critical in many scientific applications, such as video streaming/conferencing, remote rendering on tiled display walls, or 3D virtual reality. Current Data Transfer Protocols rely on UDP as well as a variety of compression techniques. None of the existing Transfer Protocols, however, scale well to many parallel Data connections. Existing parallel streaming Protocols have limited synchronization mechanisms for multiple streams, and they are prone to be slowed down significantly if one stream experiences significant packet loss. In this paper, we propose a new parallel streaming Protocol which can stream many parallel Data streams over optical networks: CSTP, the Cross-Stream Transfer Protocol. It not only tolerates random UDP packet loss, but also aims to tolerate unevenly distributed packet loss patterns across multiple streams to achieve synchronized parallel streams with limited coding overhead. We simulated the approach, and the results show that CSTP can generate steady throughput with fluctuating Data streams of different Data loss patterns, and can Transfer Data in parallel at a higher speed than multiple independent UDP streams.
T Ito - One of the best experts on this subject based on the ideXlab platform.
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On Parameter Tuning of Data Transfer Protocol GridFTP for Wide-Area Networks
2008Co-Authors: T Ito, Hiroyuki Ohsaki, Makoto ImaseAbstract:In wide-area Grid computing, geographically distributed computational resources are connected for enabling efficient and large-scale scientific/engineering computations. In the wide-area Grid computing, a Data Transfer Protocol called GridFTP has been commonly used for large file Transfers. GridFTP has the following features for solving problems of the existing TCP. First, for accelerating the start-up in TCP’s slow start phase and achieving high throughput in TCP’s congestion avoidance phase, multiple TCP connections can be established in parallel. Second, according to the bandwidth-delay product of a network, the TCP socket buffer size can be negotiated between GridFTP server and client. However, in the literature, sufficient investigation has not been performed either on the optimal number of TCP connections or the optimal TCP socket buffer size. In this paper, we therefore quantitatively investigate the optimal parameter configuration of GridFTP in terms of the number of TCP connections and the TCP socket buffer size. We first derive performance metrics of GridFTP in steady state (i.e., goodput and packet loss probability). We then derive the optimal parameter configuration for GridFTP and quantitatively show performance limitations of GridFTP through several numerical examples. We also demonstrate validity of our approximate analysis by comparing simulation results with analytic ones. Keywords—Grid Computing, GridFTP, TCP (Transmission Control Protocol), Parameter Tuning, Steady State Analysis, Parallel TCP Connection, TCP Socket Buffer
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gridftp apt automatic parallelism tuning mechanism for Data Transfer Protocol gridftp
Cluster Computing and the Grid, 2006Co-Authors: T Ito, Hiroyuki Ohsaki, Makoto ImaseAbstract:GridFTP has been used as a Data Transfer Protocol to effectively Transfer a large volume of Data in grid computing. GridFTP supports a feature called parallel Data Transfer that improves throughput by establishing multiple TCP connections in parallel. However, for achieving high GridFTP throughput, the number of TCP connections should be optimized based on the network status. In this paper, we propose an automatic parallelism tuning mechanism called GridFTP-APT (GridFTP with automatic parallelism tuning) that adjusts the number of parallel TCP connections only using information measurable in the grid middleware. Through simulation experiments, we demonstrate that GridFTP-APT significantly improves the performance of GridFTP in various network environments.
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automatic parameter configuration mechanism for Data Transfer Protocol gridftp
Symposium on Applications and the Internet, 2006Co-Authors: T Ito, Hiroyuki Ohsaki, Makoto ImaseAbstract:In this paper, we propose an automatic parameter configuration mechanism for GridFTP, which optimizes the number of parallel TCP connections by utilizing analytic results in the work of Ito et al. (2005). The proposed mechanism first measures the network status (e.g., the goodput and the round-trip time of GridFTP Data channels) at the GridFTP client. Based on these measurement results, it adjusts the number of parallel TCP connections for maximizing the GridFTP goodput. Three operational modes, MI (multiplicative increase), MI+ (multiplicative increase plus), and AIMD (additive increase and multiplicative decrease) are proposed in this paper, each of which takes a different strategy for adjusting the number of parallel TCP connections. We evaluate performance of the proposed automatic parameter configuration mechanism through simulation experiments. We demonstrate that the proposed automatic parameter configuration mechanism significantly improves the performance of GridFTP.
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CCGRID - GridFTP-APT: automatic parallelism tuning mechanism for Data Transfer Protocol GridFTP
Sixth IEEE International Symposium on Cluster Computing and the Grid (CCGRID'06), 2006Co-Authors: T Ito, Hiroyuki Ohsaki, Makoto ImaseAbstract:GridFTP has been used as a Data Transfer Protocol to effectively Transfer a large volume of Data in grid computing. GridFTP supports a feature called parallel Data Transfer that improves throughput by establishing multiple TCP connections in parallel. However, for achieving high GridFTP throughput, the number of TCP connections should be optimized based on the network status. In this paper, we propose an automatic parallelism tuning mechanism called GridFTP-APT (GridFTP with automatic parallelism tuning) that adjusts the number of parallel TCP connections only using information measurable in the grid middleware. Through simulation experiments, we demonstrate that GridFTP-APT significantly improves the performance of GridFTP in various network environments.
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SAINT - Automatic parameter configuration mechanism for Data Transfer Protocol GridFTP
International Symposium on Applications and the Internet (SAINT'06), 2006Co-Authors: T Ito, Hiroyuki Ohsaki, Makoto ImaseAbstract:In this paper, we propose an automatic parameter configuration mechanism for GridFTP, which optimizes the number of parallel TCP connections by utilizing analytic results in the work of Ito et al. (2005). The proposed mechanism first measures the network status (e.g., the goodput and the round-trip time of GridFTP Data channels) at the GridFTP client. Based on these measurement results, it adjusts the number of parallel TCP connections for maximizing the GridFTP goodput. Three operational modes, MI (multiplicative increase), MI+ (multiplicative increase plus), and AIMD (additive increase and multiplicative decrease) are proposed in this paper, each of which takes a different strategy for adjusting the number of parallel TCP connections. We evaluate performance of the proposed automatic parameter configuration mechanism through simulation experiments. We demonstrate that the proposed automatic parameter configuration mechanism significantly improves the performance of GridFTP.
