Tuning adaptive computations for the performance improvement of applications in JEE server

With the increasing use of autonomic computing technologies, a Java Enterprise Edition (JEE) application server is implemented with more and more adaptive computations for self-managing the Middleware as well as its hosted applications. However, these adaptive computations consume resources such as CPU and memory, and can interfere with the normal business processing of applications at runtime due to resource competition, especially when the whole system is under heavy load. Tuning these adaptive computations from the perspective of resource management becomes necessary. In this article, we propose a tuning model for adaptive computations. Based on the model, tuning is carried out dynamically by upgrading or degrading the autonomic level of an adaptive computation so as to control its resource consumption. We implement the RSpring tuner and use it to optimize autonomic JEE servers such as PkuAS and JOnAS. RSpring is evaluated on ECperf and RUBiS benchmark applications. The results show that it can effectively improve the application performance by 13.6 % in PkuAS and 19.2 % in JOnAS with the same amount of resources. ? 2012 The Brazilian Computer Society.EI02143-158

Post-Development Software Architecture

Abstract Software architecture (SA) plays an important role in software development. Since the lifecycle stages post development become more and more important and face with many challenges similar to the development, it is a natural idea to introduce or extend SA into the stages post development. In this paper, we present our practices and experiences on applying software architecture into the deployment and maintenance of J2EE (Java 2 Platform Enterprise Edition) applications, including the tool and principles of SAbased J2EE deployment and SA-based J2EE online maintenance. It demonstrates that 1) SA can help to achieve a holistic, finegrained and automated deployment of large-scale distributed systems by visualizing the structure of the system to be deployed; 2) SA can provide an understandable, operational and global view for online maintenance by organizing the fragmented and trivial management mechanisms; 3) Extending SA into the stages post development makes it possible that the whole lifecycle of a software system can be governed by SA with many benefits, e.g. consistency, traceability, responsiveness, etc