As modern service systems are pressured to provide competitive prices via cost-effective capacity planning, especially in the paradigm of cloud computing, service level agreements (SLAs) end up becoming ever more sophisticated, i.e., fulfilling targets of different percentiles of response times. However, it is no mean feat to predict even the average response times of real systems, or even abstracted queueing systems that typically simplify system details, and it gets even more complicated when trying to manage SLAs defined by various percentiles of response times. To efficiently capture these different percentiles, we first develop a novel and autonomic methodology - termed Burst Based Simulation, which combines burst profiling on real systems with complex, state-dependent simulations. Moreover, based on our methodology, we construct an analysis on SLA management: the prediction of SLA violations given a certain request pattern. We evaluate our approach on two types of service systems, virtualized and bare-metal, with wide ranges of SLAs and traffic loads. Our evaluation results show that our methodology is able to achieve an average error below 15% when predicting different response time percentiles, and accurately capture SLA violations.@en

To operate systems cost-effectively, cloud providers not only multiplex applications on the shared infrastructure but also dynamically allocate available resources, such as power and cores. Data intensive applications based on the MapReduce paradigm rapidly grow in popularity and importance in the Cloud. Such big data applications typically have high fan-out of components and workload dynamics. It is no mean feat to deploy and further optimize application performance within (stringent) resource budgets. In this paper, we develop a novel solution, OptiCA, that eases the deployment of big data applications on cloud and the control of application components so that desired performance metrics can be best achieved for any given resource budgets, in terms of core capacities. The control algorithm of OptiCA distributes the available core budget across co-executed applications and components, based on their 'effective' demands obtained through non-intrusive profiling. Our proposed solution is able to achieve robust performance, i.e., with very minor degradation, in cases where resource budget decreases rapidly.@en