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Wednesday, October 31, 2018 12:15 pm - 12:15 pm EDT (GMT -04:00)

PhD Seminar • Data Systems — Energy Efficiency in Database Servers with Multi-core CPUs

Mustafa Korkmaz, PhD candidate
David R. Cheriton School of Computer Science

Data centers consume significant amounts of energy and consumption is growing each year. Alongside efforts in the hardware domain, there are some mechanisms in the software domain to reduce energy consumption. One of these mechanisms is dynamic voltage and frequency scaling (DVFS) and modern servers which are equipped with multi-core CPUs. 

Thursday, November 1, 2018 10:30 am - 10:30 am EDT (GMT -04:00)

Mathematics Education Seminar — Mathematical Analogies

Andrew Beltaos / Amenda Chow
University of Waterloo / York University

Teaching via analogies builds upon students' existing knowledge. New concepts that are taught only within the context of mathematics may seem foreign to students at first glance, but if students have already learned analogous concepts elsewhere in life, as educators, we can make use of their existing framework to strengthen their learning. 

Amine Mhedhbi, PhD candidate
David R. Cheriton School of Computer Science

We study the problem of optimizing subgraph queries (SQs) using the new worst-case optimal (WCO) join plans in Selinger-style cost-based optimizers. WCO plans evaluate SQs by matching one query vertex at a time using multiway intersections. The core problem in optimizing WCO plans is to pick an ordering of the query vertices to match. 

We make two contributions: