PDL People

David Andersen

Contact:	www |
Office: Admin:	GHC 9109 Gates-Hillman 9215 (412) 268-1120
Mailing Address:	School of Computer Science Carnegie Mellon University 5000 Forbes Avenue Pittsburgh, PA 15213-3891
Position: Projects:	PDL Co-Director and Professor, CSD

Research Interests:

My research interests are in computer systems in the networked environment. I have a particular interest in exploring the systems and data structure response to evolving hardware trends near the end of Moore's law, memory and power-efficient computing, and robust distributed systems..

Highly Available Internet Architecture
This project is examining new architectural concepts to improve the availability and security of the Internet, without compromising the fundamental flexibility that underlies its success.  The primitives we are currently exploring include enhancing end-hosts' ability to select between paths through the Internet, and permitting hosts or networks greater control over what traffic they receive, in a way that is enforceable deep inside the network.  This project emphasizes real-world measurements from our own Internet testbed as well as public testbeds such as Planetlab to understand the problems  facing today's network, and to evaluate potential solutions.

The Data-Oriented Transfer project, in collaboration with researchers at Intel Research, is examining a new way to structure Internet applications that perform bulk transfers.  Instead of performing the transfers themselves, these applications pass their data to a transfer service that performs the transfer on their behalf.  The transfer service serves as a locus for the development and deployment of novel transfer techniques.  Our initial efforts include merging e-mail delivery with peer to peer techniques (e.g., using peer to peer to collaboratively deliver large file attachments to multiple receivers), and developing transfer techniques to improve the performance of applications when the underlying network layers perform poorly.

Opportunistic Resource Use in Wireless Networks
is examining better ways to make use of wireless networks by explicitly exploiting concurrent multi-path transfers, by opportunistically caching overheard traffic, and by taking advantage of quiescent periods to preemptively transfer data across the network.  This project is attempting to turn one of wireless networks weaknesses—a shared broadcast medium—Into a strength, by taking advantage of the processing and storage power available at nodes to avoid expensive wireless communication.