Shared Web caches, also referred to as proxy Web servers, allow multiple clients to quickly access a pool of popular Web pages. An organization which provides shared caching to its Web clients will typically have a collection of shared caches rather than just one. For collections of shared caches, it is desirable to coordinate the caches so that all cached pages in the collection are shared amo...

In the highly unpredictable environment of grid computing, it often makes sense to replicate the same job on several of the available servers. We prove that never replicating is optimal for a heterogeneous multi-server system in a random environment when service times are New Better than Used. © 2010 Elsevier B.V. All rights reserved.

The Decomate project enables mutual access to heterogeneous, distributed, and pooled digital resources of consortium members. Using a mediator architecture with a Broker and several back-end servers, a scalable and flexible system has been developed that is going in production in major European universities. Ongoing work focuses on access improvements using graphical browsing and thesaurus inte...

HALO: Heterogeneity-Aware Load Balancing is a paper that proposes a class of heterogeneity-aware Load Balancers (LBs) for cluster systems. LBs that are heterogeneityaware are able to detect when servers differ in speeds and in number of cores. Response times for heterogeneous systems are calculated and presented.

This paper studies a discrete-time queueing system with two heterogeneous servers subject to catastrophes. We obtain explicit expressions for the steady-state probabilities at arbitrary epoch using displacement operator method. The waiting time distribution and outside observer’s observation epoch probabilities are deduced. Various performance measures and numerical results have been investigated.

Distributed computing inherently adds complexity to computer software. Latency, distributed memory management, heterogeneous networks, fault tolerance and security are some of the issues contributing to this added complexity [5,9,12]. Specific key challenges concern server reliability, availability, and robustness; bandwidth allocation and sharing; and scalability of web and data servers [10].

Boundary value methods are applied to find transient solutions of M/M/2 queueing systems with two heterogeneous servers under a variant vacation policy. An iterative method is employed to solve the resulting large linear system and a Crank-Nicolson preconditioner is used to accelerate the convergence. Numerical results are presented to demonstrate the efficiency of the proposed method.

Query translation supporting the migration of legacy databases into cooperative information systems.guage features for interoperability of databases with schematic discrepancies.nian. On the logical foundations of schema integration and evolution in heterogeneous database systems.ping and transformation techniques for problem solving with multiple knowledge servers.