An experimental testbed to predict the performance of XACML Policy Decision Points

Butler, Bernard and Jennings, Brendan and Botvich, Dmitri (2011) An experimental testbed to predict the performance of XACML Policy Decision Points. In: IEEE/IFIP Integrated Management (IM 2011) Conference, 23-27 May 2011, Dublin.

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The performance and scalability of access control systems is a growing concern as organisations deploy ever more complex communications and content management systems. This paper describes how an (offline) experimental testbed may be used to address performance concerns. To begin, timing measurements are collected from a server component incorporating the Policy Decision Point (PDP) under test, using representative policies and corresponding requests. Our experiments with two XACML PDP implementations show that measured request service times are typically clustered by request type; thus an algorithm for request cluster identification is presented. Cluster characterisations are used as inputs to a PDP performance model for a given policy/request mix and an analytic (queueing) model is used to estimate the equilibrium server load for different mixes of request clusters. The analytic performance prediction model is validated and extended by discrete event simulation of a PDP subject to additional load. These predictive models enable network administrators to explore the capacity of the PDP for different overall loadings (requests per unit time) and profiles (relative frequencies) of requests.

Item Type: Conference or Workshop Item (Paper)
Departments or Groups: Telecommunications Software and Systems Group
Divisions: School of Science > Department of Computing, Maths and Physics
Depositing User: Bernard Butler
Date Deposited: 09 Sep 2011 17:28
Last Modified: 22 Aug 2016 10:26

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