Proessor Emeritus and Distinguished Research Professor
My long-time interest is in efficient modeling of large-scale distributed computer systems, using layered queueing to represent resource contention. This can be broken down into subtopics
(1) a fast approximate solution tool called LQNS (work continued by Prof Greg Franks),
(2) methods for finding the structure of models from request traces, and for finding their parameters by nonlinear estimation and regression techniques,
(3) deriving performance models from software designs in UML (the PUMA system and the MARTE profile for UML annotation, with Prof Petriu), and
(4) model-based optimization for better design, configuration and deployment, most recently for cloud management (with Prof Chinneck and Litoiu).
Recent research is focussed on the last topic, which can be summarized as “exploiting models for design and management”.
Positions for new graduate students:
I have two positions open for fall 2015 to study cloud optimization and models of software. The cloud studies are part of a multi-university-and-industry research network.
List of Publications
RADS Lab Home Page
UML Performance Profile: Documents