Performance antipatterns document common software performance problems as well as their solutions. These problems are often introduced during the architectural or design phases of software development, but not detected until later in testing or deployment. Solutions usually require software changes as opposed to system tuning changes. This paper presents three new performance antipatterns and g...

Performance antipatterns document common software performance problems as well as their solutions. These problems are often introduced during the architectural or design phases of software development, but not detected until later in testing or deployment. Solutions usually require software changes as opposed to system tuning changes. This paper presents three new performance antipatterns and g...

The aim of any modelling exercise is to develop a better understanding of the system that is being studied, however it is unfortunately not always easy to understand abstract performance models or the metrics that are derived from them. In this tutorial paper we focus on the facilitation of more reliable performance prediction through better understanding of models and solutions in the context ...

Most software performance problems are due to fundamental architecture or design problems. Thus they are introduced early in development, but are typically not discovered until late, when they are more difficult and costly to fix. Software Performance Engineering (SPE) is a systematic, quantitative approach for cost-effectively building performance into software systems. It consists of a proces...

ance requirements, it means that they exist in the heads of stakeholders, but nobody bothered to write them down and make sure that everybody agrees on them. Exactly what is specified may vary significantly depending on the system and environment, but all requirements should be quantitative and measurable. Performance requirements are the main input for performance testing (where they are verif...

Software performance engineering deals with the consideration of quantitative analysis of the behaviour of software systems from the early development phases in the life cycle. This paper summarizes in a semiformal and illustrative way our proposal for a suitable software performance engineering process. We try to integrate in a very pragmatic approach the usual object oriented methodology —sup...

background and objectives: given the limited number of studies on ramadan fasting and military performance, we conducted this study to identify the effect of ramadan fasting on physical fitness performances in army cadets. methods: twenty healthy males were randomly selected from a larger sample group. the subjects were divided into fasting (n=10) and non-fasting (n=10) groups. they performed v...

Context: Software performance models can be obtained by applying for specific roles, skills and techniques in software life cycle, and it depends on formulating the software problem as well as gathering the performance requirements. This paper presents a preliminary review of the software performance models. This constitutes a reference for the IT companies and personnel that help them select t...

I declare that I have developed and written the enclosed Study Thesis completely by myself, and have not used sources or means without declaration in the text. Design time performance prediction is an important aspect in the field of component-based software performance engineering. Especially in early development stages the model is on a high abstraction level and precise predictions are diffi...

Next generation Software Performance Engineering tools will exploit a model interoperability paradigm that uses the performance modeling tool best suited to the software/hardware architecture issues and the life cycle stage of the assessment. The paradigm allows the use of existing tools to the extent possible without requiring extensive changes to them. The performance model solution should be...