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; Ciciani, Bruno; Colajanni, M.. - STAMPA. - 2002-January:(2002), pp. 421-426. (Intervento presentato al convegno 10th IEEE International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunications Systems tenutosi a Fort Worth, Texas; USA nel 11-16 October 2002) [10.1109/MASCOT.2002.1167103].
Global Caching Mechanisms in Clusters of Web Servers
CICIANI, Bruno;
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
