1/5/2024 0 Comments Canada newstream ubcFurther experiments with the public-domain benchmarks ttcp and netperf confirm the performance of our implementation. For large transfers, we obtain a bandwidth of 13.5 MBytes/sec, which is close to the hardware limit when the receiver must perform a copy. End-to-end latency for 8 byte transfers is 11 microseconds, which is considerably lower than all previous implementations of the sockets interface. Our sockets implementation exploits all of these features to. SHRIMP supports protected, user-level data transfer, allows user-level code to perform its own buffer management, and separates data transfers from control transfers so that data transfers can be done without the interrupting the receiving node's CPU. This paper describes an implementation of stream sockets for the SHRIMP multicomputer. The basis of the system is the notion of a contract that describes the operations users may perform on the document. It determines precisely what the user may and may not do after the document has been transferred to the user's client machine. In this paper we present a system designed to extend the system's control over documents. When an authorised user obtains a document, its use is no longer under the scrutiny of the system-the document's provider has no control over how it is used. However, current systems, such as the Web, have limited support for document security. The multimedia data in these systems is often protected by copyright and has other restrictions on its use. Much effort has been put into providing browsing and querying tools, storing multimedia documents efficiently, and transporting the documents from a server to a client. While the former were anticipated via a generic interface and modular design structure, the latter were surprising and substantially more difficult to solve.Ĭurrent distributed multimedia systems, including the World Wide Web, allow users access to vast amounts of media-rich information. ![]() We experienced two main types of evolutionary change: requirements changes from the limited user community and performance enhancements/corrections. We discuss our experiences and insight into the development of such software products within a small research-based university environment. In addition, the application programmer's interface (API) to the server facilities has an impact on both the internal design and the performance of such a server. Since continuous media servers must send the raw data to a client application over a network, the protocol considerations, hardware interface and data storage/retrieval methods are of the paramount importance. The user interface is a major consideration, even though the server software would appear isolated from that factor. We place emphasis on the evolution of the software and our approach to maintainability. This paper provides a case study of the design, implementation, and evolution of a continuous media file server. Media server software is significantly complicated to develop and maintain, due to the nature of the many interface aspects which must be considered. ![]() This document provides a snapshot of our design which has not yet been fully implemented and we expect to see significant evolution of the design as the implementation proceeds. ![]() We conclude with the status of the implementation and plans for completion of the design and implementation. Buffer management considerations are introduced as they affect the admission control and disk operations. Each major client interface interaction is covered, as well as the detailed operation of the server in response to client requests. The structure of the processes which implement the file server are described in detail as well as the communication between client processes and server processes. The most significant unique characteristic of this system is its approach to admission control which utilizes the time-varying requirements of the variable bit-rate data streams currently admitted into the system to properly allocate disk resources. This report describes the internal design of the UBC Distributed Continuous Media File Server as of April 1995.
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