This article studies the "filter effects" that occur in Web proxy caching hierarchies due to the presence of multiple levels of caches. That is, the presence of one level of cache changes the structural characteristics of the workload presented to the next level of cache, since only the requests that miss in one cache are forwarded to the next cache. Experiments focus on the effects of cache size, cache replacement policy, Zipf slope, and the depth of the Web proxy caching hierarchy.Finally, the article considers novel cache management techniques that can better exploit the changing workload characteristics across a multilevel Web proxy caching hierarchy. Trace-driven simulations are used to evaluate the performance of these approaches. The simulation results demonstrate that size-based partitioning and heterogeneous cache replacement policies each offer improvements in overall caching performance.
Over a year ago, we launched support for partial response and partial update for a number of APIs based on the Google Data Protocol. That launch was a part of our continuous effort to make the web faster. It was well received by our developer community as it significantly reduced network, memory, and CPU resources needed to work with certain Google APIs.
Today, we are adding support for partial response and an improved version of partial update, called patch, to a number of newer APIs such as Buzz, URL Shortener, Tasks and many others. In fact, all APIs available in the Google APIs Discovery Service and the APIs Explorer now support this feature.
Written by Google, this library is a flexible and efficient Objective-C framework for accessing JSON APIs.
This is the recommended library for accessing JSON-based Google APIs for iOS and Mac OS X applications. The library is compatible with applications built for iOS 3 and later, and Mac OS X 10.5 and later.
links for 2011-09-01