After about two decades of evolution parallel database architectures have finally reached a maturity level that makes them a serious competitor to traditional mainframe based architectures and distributed database systems. Dealing with these innovative systems requires to change considerably the application design process, mostly because of the sophisticated physical data organization (e.g. rel...

Visualization andanimation tools may become extremely important aids in the understanding, verification, and performance tuning of parallel computations. Presently, however, the use of visualization has had only a limited use for enhancing parallel computation. We hypothesize that one of the primary reasons for the limited use of visualization tools in parallel program development is the diffic...

Fast databases are a necessity in today’s Ecommerce environment. Information from the database has to be provided at fast rates to impatient customers, otherwise they will move on to competitors with more attentive services. Corporations needing up-to-date internal information cannot wait for long running queries that process numbers and produce detailed statistics. Instead, they need databases...

This paper presents an outline for a general I/O subsystem whose main objective is flexibility and customizability. It is based on the concept of frameworks, a technology that has proven to be extremely applicable in the operating systems area. We present our two-step model for application development, which separates the inherent computation of an application from platform specific performance...

Article history: Received 6 July 2010 Received in revised form 3 May 2011 Accepted 16 June 2011 Available online 7 July 2011 This paper presents a study of the Multi-Type Reverse Nearest Neighbor (MTRNN) query problem. Traditionally, a reverse nearest neighbor (RNN) query finds all the objects that have the query point as their nearest neighbor. In contrast, anMTRNN query finds all the objects ...

Business Process Management (BPM) solutions provide full integration between business and IT requirements, ensuring that the business requirement adapt more easily to the environmental changes. Given that today's business environment is characterized by ever growing dynamism, the use of BPM solutions can provide additional consistency and opportunities for rapid alignment to change. In this art...

Even though shared memory multiprocessors are becoming more and more common, it is still a formidable task to achieve high performance on parallel applications. One of the main reasons for this is a high amount of implicit communication generated by the program due to poor structuring of the program. This article shows the importance of performance visualisation in order to spot and find the so...

Performancetuning a parallel application involves integratingperformancedata from many components of the system, including the message passing library, performance monitoring tool, resource manager, operating system, and the application itself. The current practice of visualizing these data streams using a separate, customized tool for each source is inconvenient from a usability perspective, a...

The kinematic and algorithmic singularities in controlling robotic manipulators have been investigated intensively because they are not predictable or difficult to avoid. The problem with handling these singularities is an unnecessary performance reduction in non-singular region and the difficulty in performance tuning. In this paper, we propose a method of avoiding kinematic and algorithmic si...

coarse tuning of an MVS system by analyzing it into its software and hardware components and increasing their eficiency successively. The method involves adjustments to swapping, the inputoutput load, the CPU load, main storage, and the system resources manager. Also discussed are performance measures necessary to characterize a system, tools to tune a system, and various aspects of data gather...