T. Berners-Lee, A. Lutonen, and H. Nielsen, Cern httpd. http://www3.org/Daemon/Status.html, 1996.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....requests into one multicast session, thus, reducing server load and network load. Unfortunately, this solution does increase the average start up latency. Caching of web objects for improving end to end latency and for reducing network load has been studied extensively starting with CERN httpd [3], followed by improvements in hierarchical caching and co operative caching under the Harvest project [4] 5] and the Squid project [6] respectively. Surprisingly, there has been very little work to extend cache systems to support streaming media. Existing caching schemes are not designed for ....

....cooperative caching, the maximum and average server load are reduced by about 67 compared to proxy caching. Furthermore, the burden is spread quite evenly among the caches. As a result, network hot spots are eliminated. V. RELATED WORK Related work on web caching systems such as CERN httpd [3], Harvest [4] 5] and Squid [6] has already been mentioned in Section I. These systems are designed for classical web objects and do not offer any support for streaming media. Furthermore, their static web caching architecture is very different from self organizing cache cooperation and dynamic ....

T Berners-Lee A. Lutonen, H.F. Nielsen, "Cern httpd," http://www.w3.org/Daemon/Status.html, 1996.

....requests into one multicast session, thus, reducing server load and network load. Unfortunately, this solution does increase the average start up latency. Caching of web objects for improving end to end latency and for reducing network load has been studied extensively starting with CERN httpd [3], followed by improvements in hierarchical caching and co operative caching under the Harvest project [4] 5] and the Squid project [6] respectively. Surprisingly, there has been very little work to extend cache systems to support streaming media. Existing caching schemes are not designed for ....

....cooperative caching, the maximum and average server load are reduced by about 67 compared to proxy caching. Furthermore, the burden is spread quite evenly among the caches. As a result, network hot spots are eliminated. V. RELATED WORK Related work on web caching systems such as CERN httpd [3], Harvest [4] 5] and Squid [6] has already been mentioned in Section I. These systems are designed for classical web objects and do not offer any support for streaming media. Furthermore, their static web caching architecture is very different from self organizing cache cooperation and dynamic ....

T Berners-Lee A. Lutonen, H.F. Nielsen, "Cern httpd," http://www.w3.org/Daemon/Status.html, 1996.

....machines. Unfortunately, event driven servers have been observed to perform poorly under real conditions. In a recent study of Digital s Palo Alto Web proxies, Maltzahn et al. 11] found that the Squid (formerly Harvest) proxy server[5, 22] performs no better than the older CERN proxy[10]. This is surprising, because the CERN proxy forks a new process to handle each new connection, and This paper will appear in the Proceedings of the USENIX Annual Technical Conference, New Orleans , LA, June 1998. process creation is a moderately expensive operation. This result is also in ....

A. Luotonen, H. F. Nielsen, and T. Berners-Lee. CERN httpd 3.0A. http://www.w3.org/pub/WWW /Daemon/, July 1996.

....systems use caching for memory and local disk accesses as well. The most difficult part of any caching scheme is maintaining cache consistency , or keeping the cached data synchronized with the source. As mentioned above, HTTP has the If Modified Since feature for this purpose. The CERN HTTPD [20] is the original proxy cache. Under heavy load, it suffers from two design flaws: 1) each request is handled by a separate process, and 2) the filesystem is used to index cached objects (i.e. each cache lookup requires a stat( system call) CERN caches can be arranged hierarchically, but every ....

....NetCache [23] The other is called Squid, which we maintain as a part of our National Science Foundation grant to develop a prototype caching architecture [24] Harvest, NetCache, and Squid all support ICP. Most Web caching systems in use today, including Squid, are demand driven from the clients [25, 26, 27, 28, 29, 22, 20]. In other words, the caches are passive, and objects are only retrieved or validated when requested by a client. This is similar to how Sun Microsystems Network File System (NFS) 30] operates. NFS servers are stateless (as are HTTP servers) and NFS clients are tasked with maintaining cache ....

A. Lutonen, H. F. Nielsen, and T. Berners-Lee, "Cern httpd," July 1996. http://www.w3. org/pub/WWW/Daemon/Status.html.

....and the broker) were quite popular as well, and are still being used in a number of places. In fact, a group of volunteers has emerged to continue development of that code. At that time, the only other Web caching (sometimes also called proxy) software in widespread use was the CERN HTTP Daemon[8]. The Harvest cache had two features that made it an attractive alternative to CERN s proxy. First, while CERN used a separate process for each request, Harvest serviced almost all proxy requests in a single process. The exception is FTP transfers, which are handled in an external process due to ....

A. Lutonen, H. F. Nielsen, and T. Berners-Lee, "Cern httpd," July 1996. http://www.w3.org/pub/ WWW/Daemon/Status.html.

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T. Berners-Lee, A. Lutonen, and H. Nielsen, Cern httpd. http://www3.org/Daemon/Status.html, 1996.

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T. Berners-Lee, A. Lutonen, and H. Nielsen, Cern httpd. http://www3.org/Daemon/Status.html, 1996.

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T. Berners-Lee, A. Lutonen, and H. Nielsen, Cern httpd. http://www3.org/Daemon/Status.html, 1996.

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