Performance tuning is a common topic in the research domain High Performance Computing. Currently, various tools have been developed to help programmers understand the runtime execution behavior of their applications. It is clear that such tools are also required for performance analysis on virtual machines, where applications, together with their execution environment, sit on top of a virtuali...

The capability to view detailed events taking place inside of a speech search engine can be essential for reducing the computational complexity and enhancing the accuracy of a speech recognition system. This paper describes a generic search visualization and performance tuning tool, Vista, which permits a user to interactively examine data within the search module of a speech recognition system...

This paper describes the use of a new automatic evaluation technique to evaluate speech-enabled computer aided pronunciation learning (CAPL) systems. The CAPL system is a part of a computer aided automatic training of correct recitation for the holy Qur an for Arabic speakers. The proposed technique evaluates the system by measuring the degree of usefulness of its feedback to learners. Evaluati...

Designing an efficient parallel program usually involves iteration of performance tuning. During this process a very large amount of performance data is produced. Without a proper software tool, the process of performance tuning can be very complicated and tedious. In this paper we describe a performance tuning tool for message passing programs. Our tool uses a relational approach to organise t...

In many cases compiler based optimizations for memory performance tuning are too limited and programmers have to resort to manual optimization techniques However this process is tedious and time consuming especially since there is no indication on when the process can stop i e when optimal memory performance has been achieved or su ciently approached Architecture simulators can provide such inf...

Distributed Object Systems are known to be very complex. Consequently it is very difficult, if not impossible, to see the overall relationship among participating objects in the system. That complicates the issues connected with performance tuning and maintenance. An economical way to visualize the system is clearly needed. In this paper, we propose a tracing facility for Java-based distributed...

An MPEG audio/video player in software is implemented on a commercial operating system and is detailed evaluated. The primary purpose of this work is to explore new system technologies in QoS management for advanced multimedia applications. Here, we address the performance analysis of this software-MPEG-II player and report the experiences in performance tuning and QoS enhancements via empirica...

Spinlocks are widely used in database engines for processes synchronization. KGX mutexes is new retrial spin-locks appeared in contemporary Oracle R versions for submicrosecond synchronization. The mutex contention is frequently observed in highly concurrent OLTP environments. This work explores how Oracle mutexes operate, spin, and sleep. It develops predictive mathematical model and discusses...

An audio fingerprint is a content-based compact signature that summarizes an audio recording. Audio Fingerprinting technologies have recently attracted attention since they allow the monitoring of audio independently of its format and without the need of meta-data or watermark embedding. These technologies need to face channel robustness as well as system accuracy and scalability to succeed on ...

Parsek2D-MLMD is a semi-implicit Multi Level Multi Domain Particle-in-Cell (PIC) code for the simulation of astrophysical and space plasmas. In this Whitepaper, we report on improvements on Parsek2D-MLMD carried out in the course of the PRACE preparatory access project 2010PA1802. Through algorithmic enhancements – in particular the implementation of smoothing and temporal sub-stepping – as wel...