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Although extremely high-speed interconnects are available today, the traditional protocol stacks such as TCP/IP and UDP/IP are not able to utilize the maximum network bandwidth due to inherent overheads in the protocol stacks. Such overheads are a big obstacle for high-performance computing applications to exploit high-speed interconnects in cluster environments. To address this issue, many researchers have been presenting analyses of protocol overheads and suggesting a number of optimization approaches to harness the TCP/IP suite over high-speed interconnects. However, to the best of our knowledge, there is no study that analyzes and optimizes the protocol overheads thoroughly in an integrated manner. In this paper, we exploit a set of protocol optimization mechanisms in an integrated manner while dealing with the full spectrum of the protocol layers from the transport layer to the physical layer. To evaluate the impact of each protocol overhead, we apply the optimization mechanisms one by one and perform detailed analyses at each step. The thorough overhead measurements and analyses reveal the dependencies between protocol overheads. With our comprehensive optimizations, we show that UDP/IP can utilize more than 95% of the maximum network throughput a Myrinet-based experimental system can provide.
Chuck YooEmail:
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2.
The paper by G.J. Holzmann (see ibid., vol.23, no.5, p.279-95, 1997) describes how to apply SPIN to the verification of a synchronization algorithm (L.M. Ruane, 1990) in process scheduling of an operating system. We report an error in the verification model presented by G.J. Holzmann and present a revised model with verification result. Our result explains the reason why SPIN found the race condition in the synchronization algorithm. We also show that the suggested fix by G.J. Holzmann is incorrect  相似文献
3.
Gigabit networks are equipped with increasingly intelligent network interface cards, and the firmware running in the cards does various tasks related to end-to-end communication. For an accurate performance evaluation of gigabit networks, it is very important to characterize and quantify the firmware. However, the firmware has been neglected in the latency analyzes of network protocols.This paper presents an in-depth latency analysis of Myrinet. Our findings include that the major bottleneck is the network interface card itself. This is true especially for so-called lightweight user-level protocols (such as BPI of Myrinet) designed for high-speed communication. Although BPI is very lean and efficient in the host, its sending throughput becomes similar to UDP. This result is very unexpected and surprising. Through firmware-level measurements, we identify that the cause of bottleneck is the DMA performance.  相似文献
4.
This paper proposes camera and media stream management techniques at the middleware level for implementing a U-City (ubiquitous city). The study focuses on overcoming the difficulties associated with developing middleware capable of processing and streaming multimedia data from a large number of cameras by expanding the traditional media processing technology. The content of the study can be classified into two main categories: One is a camera array management technique that involves the middleware-level framework and protocol for managing the camera array. The other is the media stream management technique for effective delivery management and processing of the multimedia streams from the camera array.
Chuck YooEmail:
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