engleski

Directory Based Multi-tier Internet Architectures

Traditional two-tier client/server architectures are sometimes replaced by more scalable multi-tier architectures based on caches. However, the effectiveness of these caches, proxy caches, is often not very high. One of the possible ways to improve their effectiveness is to connect them together to create a distributed cache system. A Distributed Cache Management (DCM) protocol provides the communication infrastructure for such a distributed cache system. A version of a DCM protocol was introduced in Harvest, and improved in Squid. After that, the Berkeley protocol further attempted to improve the performance of DCM protocols. We introduce a directory-based DCM protocol that attempts to provide additional improvements. We compare the performance of Squid, Berkeley, and the directory-based DCM protocol, with measurements from real operational systems and analytical performance prediction for large-scale distributed caches.

World Wide Web proxy cache; distributed cache; distributed cache management protocol; performance measurement; analytical performance prediction; performance comparison

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