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....environment: lters on an intermediary host drop, delay, or transform data moving between mobile and xed hosts. However, the lters are part of the application, complicating their reuse and making it awkward to support legacy applications. Proxies have been used as caching and pre fetching agents [7, 40] to hide latencies in fetching data from across the network. In the context of multicast, 5] is a proxy framework for real time audio video data. The InfoPad project [25] used an extreme approach with proxies: move all intelligence into the infrastructure and use the PDA simply as a dumb ....

National Laboratory for Applied Network Research. The Squid Internet Object Cache. http://squid.nlanr.net/.

....under most implementations (including Solaris, Linux, and FreeBSD) returns immediately regardless of whether or not the requested data is in fact in memory. Therefore, the application thread could block waiting for data to be read from disk even when non blocking file descriptors are used. Squid [21] corrected this bug by using a separate thread pool to issue disk I O requests. and database connections are usually pooled to limit resource consumption on the server; replication is used across several servers to provide scalability and fault isolation. Because these systems tend to be ....

National Laboratory for Applied Network Research. The Squid Internet Object Cache. http://www.squid-cache.org.

....filters on an intermediary host drop, delay, or transform data moving between mobile and fixed hosts. However, the filters are part of the application, complicating their reuse and making it awkward to support legacy applications. Proxies have been used as caching and pre fetching agents [7, 30] to hide latencies in fetching data from across the network. In the context of multicast, 4] is a proxy framework for real time audio video data. The InfoPad project [19] used an ex 2 goodput is the ratio of useful bytes to total bytes transmitted Submitted to ACM Multimedia 98 Tracking No. ....

National Laboratory for Applied Network Research. The Squid Internet Object Cache. http://squid.nlanr.net/.

.... SERVICE MODEL After investigating both multi threaded and event driven server models, we came to the same conclusions as previous studies [5] that thread or process per connection servers such as NCSA [27] and Apache [4] are less scalable than event driven servers such as Harvest [7] and Squid [28]. 3.1 Execution Model We decided upon a hybrid execution model that uses both thread tasks for monitor operations and work object tasks for the eventdriven proxy cache service finite state machines. All of the tasks are associated with a single loadable module. Figure 2 illustrates the execution ....

National Laboratory for Applied Network Research. Squid Internet Object Cache. Available from http://squid.nlanr.net/

....permanence and consistency guarantees, but it does so at the cost of performance and availability in the case of failure. Furthermore, there is a dearth of multi node RDBMS s, and those that do exist are prohibitively expensive. Use a networked or distributed lesystem: most Internet web caches [16, 32] and web servers [65] use this approach. Networked lesystems tend to have a single, centralized le server that becomes an available and scalability bottleneck; distributed lesystems can overcome this problem. Filesystems in general su er from a host of performance problems stemming from the ....

National Laboratory for Applied Network Research. The squid internet object cache. http://squid.nlanr.net.

....from these approaches, we hope to motivate a broader research program in this area. 1. Motivation, Hypothesis, Relevance Increasingly, infrastructure services comprise not only routing, but also application level resources such as search engines [15] adaptation proxies [8] and Web caches [20]. These applications must confront the same 24 Theta 7 operational expectations and exponentially growing user loads as the routing infrastructure, and consequently are absorbing comparable amounts of hardware and software. The current trend of harnessing commodity PC clusters for scalability and ....

National Laboratory for Applied Network Research. The Squid internet object cache. http://squid.nlanr.net.

....filters on an intermediary host drop, delay, or transform data moving between mobile and fixed hosts. However, the filters are part of the application, complicating their reuse and making it awkward to support legacy applications. Proxies have been used as caching and pre fetching agents [8, 34] to hide latencies in fetching data from across the network. In the context of multicast, 5] is a proxy framework for real time audio video data. The InfoPad project [22] used an extreme approach with proxies: move all intelligence into the infrastructure and use the PDA simply as a dumb ....

National Laboratory for Applied Network Research. The Squid Internet Object Cache. http://squid.nlanr.net/.

....that can be regenerated by computation, but if the service bills the user per session, the billing should certainly be delegated to an ACID database. We focus on services that have an ACID component, but manipulate primarily BASE data. Web servers, search aggregation servers [58] caching proxies [12,41], and transformation proxies are all examples of such services; our framework supports a superset of these services by providing integrated support for the requirements of all four. As we will show, BASE semantics greatly simplify the implementation of fault tolerance and availability and permit ....

National Laboratory for Applied Network Research. The Squid Internet Object Cache. http://squid.nlanr.net.

....(ICP) 18] has been very successful at encouraging the practice of Web cache sharing around the world. It requires loose coordinations among the proxies, and is built on top of UDP for efficiency. It was designed by the Harvest research group [26] and supported by both the publicdomain Squid [19] proxy software and some commercial products today. With the deployment of Squid proxies around the globe, ICP is widely used by international countries to reduce traffic over trans Atlantic and trans Pacific links. Despite its success, ICP is not a scalable protocol. The problem is that ICP ....

National Lab for Applied Network Research. Squid internet object cache. http://squid.nlanr.net/Squid/, 1998.

....that can be regenerated by computation, but if the service bills the user per session, the billing should certainly be delegated to an ACID database. We focus on services that have an ACID component, but manipulate primarily BASE data. Web servers, search aggregation servers [58] caching proxies [14,44], and transformation proxies are all examples of such services; our framework supports a superset of these services by providing integrated support for the requirements of all four. As we will show, BASE semantics greatly simplify the implementation of fault tolerance and availability and permit ....

National Laboratory for Applied Network Research. The Squid Internet Object Cache. http://squid.nlanr.net.

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National Laboratory for Applied Network Research, Squid Internet Object Cache, http://squid.nlanr.net/Squid/.

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National Laboratory for Applied Network Research, Squid Internet Object Cache, http://squid.nlanr.net/Squid/.

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