Detecting and Analyzing I/O Performance Regressions

Regression testing can be done by re-executing a test suite on different software versions and comparing the outcome. For functional testing, the outcome of such tests is either pass (correct behaviour) or fail (incorrect behaviour). For non-functional testing, such as performance testing, this is more challenging as correct and incorrect are...

Performance Optimization of Deployed Software-as-a-Service Applications

Preprint submitted to Elsevier. The goal of performance maintenance is to improve the performance of a software system after delivery. As the performance of a system is often characterized by unexpected combinations of metric values, manual analysis of performance is hard in complex systems. In this paper, we propose an approach that helps...

System Load Characterization Using Low-Level Performance Measurements

The performance of a software system directly influences customer satisfaction. Self-adaptiveness can contribute to this customer satisfaction by (1) taking appropriate measures when the performance becomes critical, e.g., the system load is too high, or (2) scheduling intensive tasks when the load is low. We investigate how self-adaptive...

Locating Performance Improvement Opportunities in an Industrial Software-as-a-Service Application

Preprint of paper published in: ICSM 2012 - Proceedings of the IEEE International Conference on Software Maintenance, 23-28 September 2012; doi:10.1109/ICSM.2012.6405319 The goal of performance maintenance is to improve the performance of a software system after delivery. As the performance of a system is often characterized by unexpected...

Using Pattern Recognition Techniques for Server Overload Detection

One of the key factors in customer satisfaction is application performance. To be able to guarantee good performance, it is necessary to take appropriate measures before a server overload occurs. While in small systems it is usually possible to predict server overload using a subjective human expert, an automated overload prediction mechanism is...

Server Overload Detection and Prediction Using Pattern Classification

One of the key factors in customer satisfaction is the application performance. In traditional settings, it is usually not very difficult to manually detect a performance problem, however, with the advent of ultra-large-scale (ULS) systems [4], manual performance monitoring and prediction becomes tedious and would thus ideally require automation...

Enabling multi-tenancy: An industrial experience report

Multi-tenancy is a relatively new software architecture principle in the realm of the Software as a Service (SaaS) business model. It allows to make full use of the economy of scale, as multiple customers – “tenants” – share the same application and database instance. All the while, the tenants enjoy a highly configurable application, making it...

Challenges of reengineering into multi-tenant SaaS applications

Multi-tenancy is a relatively new software architecture principle in the realm of the Software as a Service (SaaS) business model. It allows to make full use of the economy of scale, as multiple customers "tenants" share the same application and database instance. All the while, the tenants enjoy a highly configurable application, making it...

Automated Security Testing of Web Widget Interactions

This paper is a pre-print of: Cor-Paul Bezemer, Ali Mesbah, and Arie van Deursen. Automated Security Testing of Web Widget Interactions. In Proceedings of the 7th joint meeting of the European Software Engineering Conference and the ACM SIGSOFT Symposium on the Foundations of Software Engineering (ESEC/FSE’09). Research Papers. ACM. 2009. We...

Produktie van L-lysine uit varkensdrijfmestcentrifugaat

Document(en) uit de collectie Chemische Procestechnologie.

Recovery van NMP en Calciumchloride uit een oplossing van NMP, water, Calciumchloride en Zoutzuur

Document(en) uit de collectie Chemische Procestechnologie

Recovery van NMP en Calciumchloride uit een oplossing van NMP, water, Calciumchloride en Zoutzuur

Document(en) uit de collectie Chemische Procestechnologie

Propaan dehydrogenering

Transporteurs voor eenheden

De produktie van mierezuur door direkte hydrolyse van methylformiaat

Document uit de collectie Chemische Procestechnologie

De bereiding van Pentaerythritol

Document(en) uit de collectie Chemische Procestechnologie

Bereiding van alcohol en furfurol uit maiskolven

Document(en) uit de collectie Chemische Procestechnologie