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Effective resource management of virtualized environments is a challenging task. State-of-the-art management systems either rely on analytical models or evaluate resource allocations by running actual experiments. However, both approaches incur a significant overhead once the workload changes. The former needs to re-calibrate and re-validate models, whereas(More)
The power consumption of the Internet and datacenter networks is already significant, and threatens to shortly hit the power delivery limits while the hardware is trying to sustain ever-increasing traffic requirements. Existing energy-reduction approaches in this domain advocate recomputing network configuration with each substantial change in demand.(More)
We describe the design and implementation of Deep-Dive, a system for transparently identifying and managing performance interference between virtual machines (VMs) co-located on the same physical machine in Infrastructure-as-a-Service cloud environments. DeepDive successfully addresses several important challenges , including the lack of performance(More)
In this paper, we have presented a survey of the power control techniques for modern wireless DS-CDMA communication systems. Power control is the single most important system requirement for DS-CDMA system. Well-defined power control is essential for proper functioning of the DS-CDMA system. In the absence of power control the effect of near/far phenomena(More)
DiCE is a system for online testing of federated and heterogeneous distributed systems. We have built a prototype of DiCE and integrated it with an open-source BGP router. DiCE quickly detects three important classes of faults, resulting from configuration mistakes, policy conflicts and programming errors. The goal of this demo is to showcase our DiCE(More)
Suisse 2012 PAR Aleksandar Dragojević To Marija for all her love and support. Acknowledgements I would first like to thank my thesis supervisor Rachid Guerraoui without whose advice and guidance this thesis would not have been written. I also thank the president of the jury André Schiper and the members of the jury Tim Harris, Pascal Felber, and Viktor(More)
In this paper the influence of the channel estimation error on the performance of the closed loop Tx diversity algorithms for WCDMA is studied for high number of Tx antennas. The analysed algorithms are recently proposed generalised closed loop Tx diversity, all-antenna Tx diversity and one-antenna selection Tx diversity. It was shown that generalised(More)
n recent years the cellular communications market has exploded. The main goal of cellular communications systems that consist of sets of mobiles (MS), base stations (BS), and mobile switching centers (MSC), as depicted in Fig. 1, is to enable communication services irrespective of time and location. It is already possible to imagine a subscriber who, in the(More)