We investigate how to improve Web cluster performance through cooperation protocols for a shared use of the main memories of the server nodes (global caching). Many popular schemes to locate requested documents are based upon locality information sharing (namely, informed cooperation); we also propose a novel approach for document lookup through a query broadcasting mechanism (namely, on-demand cooperation). Moreover, we consider the migration and handoff mechanisms to retrieve successfully located documents. The experimental results show that, in a static Web scenario, the on-demand with handoff scheme performs similarly to the informed with handoff scheme, whereas the on-demand with migration scheme outperforms the informed with migration scheme. On the other hand, in a scenario with some dynamic requests, on-demand cooperation experiences a significant performance degradation with respect to informed cooperation.
Global caching mechanisms in clusters of Web servers / Poleggi, M. E.; Ciciani, B.; Colajanni, M.. - 2002-:(2002), pp. 421-426. (Intervento presentato al convegno 10th IEEE International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunications Systems, MASCOTS 2002 tenutosi a usa nel 2002) [10.1109/MASCOT.2002.1167103].
Global caching mechanisms in clusters of Web servers
Ciciani B.;Colajanni M.
2002
Abstract
We investigate how to improve Web cluster performance through cooperation protocols for a shared use of the main memories of the server nodes (global caching). Many popular schemes to locate requested documents are based upon locality information sharing (namely, informed cooperation); we also propose a novel approach for document lookup through a query broadcasting mechanism (namely, on-demand cooperation). Moreover, we consider the migration and handoff mechanisms to retrieve successfully located documents. The experimental results show that, in a static Web scenario, the on-demand with handoff scheme performs similarly to the informed with handoff scheme, whereas the on-demand with migration scheme outperforms the informed with migration scheme. On the other hand, in a scenario with some dynamic requests, on-demand cooperation experiences a significant performance degradation with respect to informed cooperation.
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