Tim Deegan

Hello. I'm Tim Deegan, a computer scientist and coder, living in Cambridge, England. (If you're looking for the DJ or the weatherman, try elsewhere.)

My email address is tjd@phlegethon.org. I used to do PGP, but have given up on it.
If you send me email, please use plain text.

Professional

I'm one of the maintainers of the Xen hypervisor, responsible for x86 memory-management code. I've worked on Xen since 2006, first at XenSource and then at Citrix, who bought XenSource in 2007. I now work on Xen part-time, and spend the rest of my time building interesting data-storage systems.

Once upon a time I was a sysadmin, first in the part of UCD computing services that ran the .ie ccTLD, and then in the Secure Hosting division of Baltimore Technologies.

I am not currently looking for work; I have more than enough jobs, thank you1. If you're a professional recruiter, please don't contact me.

Academic

I have a PhD from the University of Cambridge Computer Laboratory, in the Networks and Operating Systems part of the Systems Research Group. While I was there I was also involved in some infrastructure work for the Xenoservers project. For a while I looked at at processor architectures for network nodes, based on all-optical logic, and specifically at how to do sensible instruction scheduling and data layout on systems with delay-line based memory. My supervisor was Jon Crowcroft

Publications

• [PDF] [Abstract] Breaking Up is Hard to Do: Security and Functionality in a Commodity Hypervisor. Patrick Colp, Mihir Nanavati, Jun Zhu, William Aiello, George Coker, Tim Deegan, Pete Loscocco and Andrew Warfield. Proc. 23rd ACM SOSP, October 2011.
• [PDF] [Abstract] Turning down the LAMP: Software Specialisation for the Cloud. Anil Madhavapeddy, Richard Mortier, Ripduman Sohan, Thomas Gazagnaire, Steven Hand, Tim Deegan, Derek McAuley and Jon Crowcroft. Proc. 2nd HotCloud, June 2010.
• [PDF] [Abstract] Improving Performance by Embedding HPC Applications in Lightweight Xen Domains. Samuel Thibault and Tim Deegan. Proc. 2nd HPCVIRT, March 2008.
• [PDF] [Abstract] Lazy Susan: dumb waiting as proof of work. Jon Crowcroft, Tim Deegan, Christian Kreibich, Richard Mortier and Nicholas Weaver. Technical Report UCAM-CL-TR-703, University of Cambridge, November 2007.
• [PDF] [Abstract] Melange: creating a "functional" Internet. Anil Madhavapeddy, Alex Ho, Tim Deegan, Ripduman Sohan and David Scott. Proc. 2nd EuroSys, March 2007.
• [PDF] [Abstract] The Main Name System. Tim Deegan. PhD dissertation, April 2006.
• [PDF] [Abstract] The Main Name System: An exercise in centralized computing. Tim Deegan, Jon Crowcroft and Andrew Warfield. ACM SIGCOMM CCR 35(5), pp. 5-13, October 2005.
• [PDF] [Abstract] Facilitating the Development of Soft Devices. Andrew Warfield, Keir Fraser, Steven Hand, and Tim Deegan. Proc. USENIX '05, pp. 379-382, April 2005.
• [Abstract] Optimising data layout for delay-line memory. Jon Crowcroft and Tim Deegan. Electronics Letters 41(6), pp. 358-359, March 2005.
• [PS] [Abstract] IP Route Lookups as String Matching. Austin Donnelly and Tim Deegan. Proc. 25th IEEE LCN, pp. 598-585, November 2000.

Pointless factoid: this gives me an Erdös number of three2.

1. That goes double for City-of-London jobs. I'm not interested in numerical modelling, thanks.

2. One path from me to Erdös:
Breaking Up is Hard to Do: Security and Functionality in a Commodity Hypervisor, Patrick Colp, Mihir Nanavati, Jun Zhu, William Aiello, George Coker, Tim Deegan, Pete Loscocco and Andrew Warfield. Proc. 23rd ACM SOSP, October 2011.
A random graph model for massive graphs, William Aiello, Fan R. K. Chung, and Linyuan Lu, Proc. 32nd ACM STOC, pp. 171-180, May 2000.
On unavoidable graphs. Fan R. K. Chung, Paul Erdös, Combinatorica 3(2), pp. 167-176, June 1983

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Tim Deegan