Current Projects

Evaluating the Hairy Edge Hypothesis: The Effects of Wireless Link Variability on WSN Communication Protocols

Wireless links display a wide range of variability in packet reception rate over both time and space. The rate of variability, or churn, of the links are fundamental to the overall behavior of collection, dissemination, and routing in low-power wireless networks. In our work, we explore effects of link churn on the upper layers of communication and try to quantify the effects on network topologies, neighbor selection, and overhead in communication.

Datasense

Representing a major investment for many organizations, data centers are being provisioned to maintain high levels of performance while improving energy-consumption efficiency. This paper examines the dynamics of heat flow across a rack of servers in a machine room inside the computer science building (Soda Hall) at the University of California, Berkeley. By observing heat dissipation of a rack of servers in various states of use, we derive a workload-dependent temperature model and use this model to design a probabilistic temperature-aware load balancer. Our load balancer is able to effectively create a uniform temperature profile across a rack in simulation – a known technique to improve cooling efficiency.