Hardware monitoring through performance counters is available on almost all modern processors. Although these counters are originally designed for performance tuning, they have also been used for evaluating power consumption. We propose two approaches for modelling and understanding the behaviour of high performance computing (HPC) systems relying on hardware monitoring counters. We evaluate th...

The development and implementation of new network protocols and applications need accurate, scalable, reconfigurable, and inexpensive tools for debugging, testing, performance tuning and evaluation purposes. Network emulation provides a fully controllable laboratory network environment in which protocols and applications can be evaluated against predefined network conditions and traffic dynamic...

MATE (Monitoring, Analysis and Tuning Environment) is a tuning environment for MPI parallel applications [1]. It augments on-line automated performance diagnosis with dynamic code optimization to combine the advantages of both automated analysis and computational steering. MATE does not require program modifications to expose steerable parameters. Instead, it uses dynamic instrumentation to adj...

Microprocessors continue to make great strides in performance and scalability, yet hardware performance monitoring remains an area of dissatisfaction amongst those interested in better understanding the interactions of hardware and software. HPM technology has, at best, maintained the status quo for over a decade, though hope for better answers still remains. As it is, HPM is well-suited for so...

Developers and users of high-performance distributed systems often observe performance problems such as unexpectedly low throughput or high latency. Determining the source of the performance problems requires detailed end-toend instrumentation of all components, including the applications, operating systems, hosts, and networks. In this paper we describe a methodology that enables the real-time...

As Web-based systems and e-commerce carry businesses into the 21st century, databases are becoming workhorses that shoulder each and every online transaction. For organizations to have effective 24/7 Web operations, they need powerhouse databases that deliver at peak performance-all the time. High Performance Web Databases: Design, Development, and Deployment arms you with every essential techn...

Beside the optimization of biometric error rates the overall security system performance in respect to intentional security attacks plays an important role for biometric enabled authentication schemes. As traditionally most user authentication schemes are knowledge and/or possession based, firstly in this paper we present a methodology for a security analysis of Internet-based biometric authent...

We propose multisection for the multiple eigenvalues (MME) method for determining the eigenvalues of symmetric tridiagonal matrices. We also propose a method using runtime optimization, and show how to optimize its performance by dynamically selecting the implementation parameters. Performance results using a Hitachi SR8000 supercomputer with eight processors per node yield (1) up to 6.3x speed...

The AgreementMaker system for ontology matching includes an extensible architecture that facilitates the integration and performance tuning of a variety of matching methods, an evaluation mechanism, which can make use of a reference matching or rely solely on “inherent” quality measures, and a multi-purpose user interface, which drives both the matching methods and the evaluation strategies. In...

Software maintenance is a very important phase in software development. It generally occupies the most of development life cycle in order to ensure software quality. This paper takes an e-commerce project as an example to study how to efficiently provide software maintenance support in offshore software development for a global deployed software product. Through interviews and a survey to the p...