Empire State Building (New York, NY) [2009]

Positions:  Performance Modeling and Simulation Lead  Blue Waters Directorate  National Center for Supercomputing Applications  University of Illinois at Urbana-Champaign  1205 W. Clark St., Office 4006C  Urbana, IL 61801, USA  Tel: +01 217 244 7736  Adjunct Assistant Professor  Computer Science Department  University of Illinois at Urbana-Champaign

I am a working in the Blue Waters Directorate at the University of Illinois at Urbana-Champaign. I am responsible for performance modeling and simulation of the Blue Waters Petascale computer and applications running on it. In this effort, I am working with William Kramer, Marc Snir, and Bill Gropp and external partners.

I am co-chair of the collective operations working group in the MPI Forum. I am interested in Collective Communications, Process Topologies, One Sided Operations, and Hybrid Programming in MPI. I am also a member of ACM SIGHPC, ACM, and IEEE.

My research interests revolve around the central topic of "Performance-centric Software Development". In the context of High-Performance Computing (HPC), one can identify three sub-branches that I am actively working on: (1) performance modeling, simulation, and optimization of large-scale parallel applications, (2) topologies, routing, and host interfaces of large-scale networks, and (3) advanced parallel programming techniques and runtime environments. An overview graph of my past and current research activities (relative to my publication list) shows their connections: Research Overview.

My Erdős number is three and I am an academic descendant of Hermann von Helmholtz.

• MPI Forum WG Chair: Collective Operations and Process Topologies Working Group
• Technical Poster Chair: Supercomputing 2012 (SC'12)
• Technical Program Co-Chair: Hot Interconnects 2011 (Hoti'11)
• Chair: 16th Intl. Workshop on High-Level Parallel Programming Models and Supportive Environments
• Co-Chair: Intl. Workshop on Runtime and Operating Systems for Supercomputers
• Program Committees: ICS'11, CCGrid'11, SC'11, SC'10, IPDPS'10, EuroMPI'10, HotI'10, Cluster'10

• Doctorate (Ph.D.), Computer Science, Indiana University Bloomington, 2008
• Diplom (M.Sc.), Computer Science, University of Technology Chemnitz, 2005

SC11	[1] T. Hoefler, W. Gropp, M. Snir and W. Kramer:
		Performance Modeling for Systematic Performance Tuning In International Conference for High Performance Computing, Networking, Storage and Analysis (SC'11), SotP Session, Nov. 2011,

ICS'11	[2] T. Hoefler and M. Snir:
		Generic Topology Mapping Strategies for Large-scale Parallel Architectures In Proceedings of the 2011 ACM International Conference on Supercomputing (ICS'11), presented in Tucson, AZ, pages 75--85, ACM, ISBN: 978-1-4503-0102-2, Jun. 2011, (acceptance rate 21.7%, 35/161)

IPDPS'11	[3] J. Domke, T. Hoefler and W. Nagel:
		Deadlock-Free Oblivious Routing for Arbitrary Topologies In Proceedings of the 25th IEEE International Parallel \& Distributed Processing Symposium (IPDPS), presented in Anchorage, AL, USA, pages 613--624, IEEE Computer Society, ISBN: 0-7695-4385-7, May 2011, (acceptance rate: 19.6%, 112/571)

SC10	[4] T. Hoefler, T. Schneider and A. Lumsdaine:
		Characterizing the Influence of System Noise on Large-Scale Applications by Simulation In International Conference for High Performance Computing, Networking, Storage and Analysis (SC'10), Nov. 2010, (acceptance rate 19.8%, 50/253) SC10 Best Paper Award

PACT'10	[5] J. Willcock, T. Hoefler, N. Edmonds and A. Lumsdaine:
		AM++: A Generalized Active Message Framework In Proceedings of the 19th international conference on Parallel architectures and compilation techniques, presented in Vienna, Austria, pages 401--410, ACM, ISBN: 978-1-4503-0178-7, Sep. 2010, (acceptance rate: 17%, 46/266)

PPoPP'10	[6] T. Hoefler, C. Siebert and A. Lumsdaine:
		Scalable Communication Protocols for Dynamic Sparse Data Exchange In Proceedings of the 2010 ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming (PPoPP'10), presented in Bangalore, India, pages 159--168, ACM, ISBN: 978-1-60558-708-0, Jan. 2010, (acceptance rate 16.8%, 29/173)

SC07	[7] T. Hoefler, A. Lumsdaine and W. Rehm:
		Implementation and Performance Analysis of Non-Blocking Collective Operations for MPI In Proceedings of the 2007 International Conference on High Performance Computing, Networking, Storage and Analysis, SC07, presented in Reno, USA, IEEE Computer Society/ACM, Nov. 2007, (acceptance rate 20%, 54/268)