Patrick Tullmann

Millbrae, CA 94030
pat (at)
LinkedIn Profile
Broad experience in operating systems implementation, language run-times, virtualization, availability, networking and storage systems with large and small teams.

Chief .* Officer at BitioticFebruary 2012 -
Millbrae, California
Design, develop, build, publish, market, and support Android games. Published Freeform Backgammmon. Follow-up game in development. Development in Java with Libgdx and OpenGL.

Senior Staff Engineer at VMware, Inc.February 2003 - September 2011
Palo Alto, California
Developed user-mode support in the ESXi hypervisor kernel with the core kernel team over several years. Improved reliability, serviceability and availability features of the ESXi kernel. Developed replica-site infrastructure for vSphere VM Replication. Worked on three patents (all granted). Gave presentations at VMworld (`07, `08 and `10).

Java Community Process JSR-121 Expert Group, via InternetApril 2001 - Dec 2003
JSR-121 proposed support for starting, controlling and managing multiple applications in Java. Representative for the Flux Research Group at the University of Utah. Drove discussions on design and on technical details, maintained CVS repository and several group documents. Built prototype implementation.

Staff Research Associate in Flux Research GroupSeptember 1997 - June 2001
Department Of Computer Science, University of Utah, Salt Lake City, Utah
Technical lead for the Janos project, a resource-aware Java Virtual Machine that is the operating system for an active networking node. Implementation in Java and C. Research in resource management including memory, CPU, and network controls.

MS, Computer Science, December 1999. University of Utah.
Emphasis in melding operating systems and language run-times. Author or co-author of eight publications and one thesis. Coursework included graphics, vision, networking, formal methods, operating systems, and compilers.
Thesis: The Alta Operating System. Alta is a Java operating system: a Java Virtual Machine that leverages type-safety to support and isolate multiple applications with similar guarantees and features as a traditional operating system.

BS, Computer Science, summa cum laude, May 1995. University of Vermont.

Languages (Expert): C, Python, Java, Latex, (GNU)make, sh.
Languages (Proficient): C++, Perl, Javascript, Tcl/Tk, HTML, SQL, Pascal, BASIC, x86 assembly, sed, autoconf, Go, m4, GLSL.
Languages (Familiar): csh, awk, ML, Postscript, Lisp, XML.
Operating Systems: Android, ESX, UNIX (Linux, FreeBSD, Solaris), Windows, Alta, Janos.
APIs/Protocols/Libraries/Tools: POSIX signals/sockets/threads, TCP/IP, C++ STL, SWIG, SQLite, OpenGL, DOM, SDL, CVS, Libgdx, REST, JSON, Eclipse, GNU toolchain, vi, emacs, HTTP, PowerPoint, Excel, blogofile, git, github, cygwin, Apache.

Transparent recovery from hardware memory errors
Error reporting through observation correlation
Static, configurable kernel interface

See my publications page for a complete list of publications.

Janos: A Java-oriented OS for Active Networks.
Patrick Tullmann, Mike Hibler, and Jay Lepreau
IEEE Journal on Selected Areas in Communications, special issue on Active Networks, March 2001.

Techniques for the Design of Java Operating Systems.
Godmar Back, Patrick Tullmann, Leigh Stoller, Wilson Hsieh, and Jay Lepreau
Proceedings of the 2000 USENIX Annual Technical Conference June, 2000.

Formal Methods: A Practical Tool for OS Implementors.
Patrick Tullmann, Jeff Turner, John McCorquodale, Jay Lepreau, Ajay Chitturi, and Godmar Back
Proceedings of the 6th Workshop on Hot Topics in Operating Systems (HOTOS-VI). May, 1997.

User-level Checkpointing Through Exportable Kernel State.
Patrick Tullmann, Jay Lepreau, Bryan Ford, and Mike Hibler
Proceedings of the 5th International Workshop on Object-Orientation in Operating Systems (IWOOOS `96) October, 1996.
The slides from my presentation are available (Postscript).

Intermediate mountain biker, expert skier, novice rock climber. Skilled with Aperture Science handheld portal device.

Available upon request.
Last updated on Wednesday, September 04, 2013