About Me

I am a computational scientist at ORNL.  I divide my time between the Scientific Computing group at the National Center for Computational Sciences and the Computational Mathematics group in the Computer Science and Mathematics division.  Previously, I was a postdoc working for George Fann in the math group.  I started working here as a postdoc in September 2005, and became a staff member in September 2007.

I obtained my Ph.D. in Computer Science with a certificate in Computational Science and Engineering from the University of Illinois at Urbana-Champaign in 2005.  I was a student of Mike Heath in the Scientific Computing group.  The title of my dissertation is "The Diffusion Equation Method for Global Optimization and Its Application to Magnetotelluric Geoprospecting."  Way back before that, I earned a B.S. in Physics from the University of Kentucky.

These days, I have been working on load balancing techniques for the octtrees in MADNESS.  On a leadership supercomputer (such as Jaguar, ORNL's flagship machine), we want to evenly distribute the load over hundreds or even thousands of processors, while minimizing the number of broken links.  Something that makes our load balancing requirements unique is the fact that we utilize the whole tree for some operations, rather than just the leaf nodes.  I have come up with some ideas that suit our purposes.  For more about our project, see our SCIDAC project web page.

See my CV (short) (long) for more information about me.

Research Interests

My research interests include

• Inverse and ill-posed problems
• Load balancing at the petascale and above
• Optimization
• Scientific computing
• Supercomputing

Links

• My handy links
• Crash Course in Supercomputing (for the 2006 crash course click here)
• Numerical Analysis Songs

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Last updated September 18, 2007

hartmanbakrj@ornl.gov