Ralph Z Roskies


410 Allen Hall
(412) 268-4960 (PSC)
Professor, Scientific Director, PSC


Roskies is the author of over 60 papers in theoretical elementary particle physics, including aspects of lattice gauge theory and symbolic computation methods applied to fundamental problems in quantum electrodynamics. In 1984, together with Professor Michael Levine of Carnegie Mellon University and James Kasdorf from Westinghouse, he developed the proposal to the National Science Foundation for what became the PSC. As Scientific Director, Roskies oversees operations, plans its future course, and concerns himself with its scientific impact. Roskies is also co-PI of the NSF Extreme Science and Engineering Discovery Environment (XSEDE) project, the NSF’s largest cyber infrastructure project. He has served as advisor to and as reviewer of a large number of U.S. and international supercomputing centers.

The Pittsburgh Supercomputing Center (PSC) co-directed by Physics Professor Ralph Roskies, is a multi-agency national supercomputing center, which is a joint effort of Carnegie Mellon and the University of Pittsburgh. The PSC has been a national leader in providing the highest capability computing to the US national research community. It has pioneered developments in file systems, heterogeneous computing, parallel algorithms and data intensive computing. Its most recent supercomputer, called Bridges, offers leading edge computation including low latency, high bandwidth nodes, large shared memory nodes, GPUs, virtual machines, persistent databases, and powerful I/O. It is designed to make it easy for users who have not traditionally used high performance computing to scale up from desktop systems, small clusters or laptops. Researchers with little or no supercomputing experience can request a starter grant for up to 50,000 core hours of computing. Proposals for larger, established research projects are selected through a peer-review process, with consideration given to the quality of the research and the need for supercomputing

The Center also has an NIH-funded concentration on biomedical supercomputing. PSC offers training in supercomputing techniques at introductory and advanced levels. Class access to PSC machines for educational purposes is easily obtained.

XSEDE (www.xsede.org) is a flagship cyberinfrastructure project funded by the US National Science Foundation (NSF). XSEDE delivers allocation services, integrated user support, software and operations services, and education and outreach activities. These not only support the NSF’s investments in high end computing but are designed to encourage development of a wider ecosystem through interoperability efforts with campuses and other cyberinfrastructure (CI) environments. XSEDE’s mission is to substantially enhance the productivity of a growing community of scholars, researchers, and engineers through access to advanced digital services that support open research; and to coordinate and add significant value to the leading cyberinfrastructure resources funded by the NSF and other agencies.

The largest components of XSEDE is the Extended Collaborative Support Service (ECSS), co-led by Roskies and Nancy Wilkins Diehr of the San Diego Supercomputer Center. ECSS pairs members of the user community with expert ECSS staff members, chosen from about 70 experts throughout the country, for an extended period, to work together to solve challenging problems through the application of cyberinfrastructure. 


Selected Publications

  • “An Overview of the XSEDE Extended Collaborative Support Program”. N Wilkins-Diehr, S Sanielevici, J Alameda, J Cazes, L Crosby, M Pierce, R Roskies. High Performance Computer Applications 6th International Conference, ISUM 2015, Mexico City, Mexico, March 9-13, 2015, Revised Selected Papers Gitler, Isidoro, Klapp, Jaime (Eds.) Springer International Publishing. ISBN 978-3-319-32243-8, 3-13, 2016. 10.1007/978-3-319-32243-8.XSEDE
  • “Value Added, Cost Avoidance, and Return on Investment”,  Stewart, Craig A.; Roskies, Ralph; Knepper, Richard; Moore, Richard L.; Whitt, Justin; Cockerill, Timothy M. , IUScholarWorks, http://hdl.handle.net/2022/20145.
  • “Bridges: A Uniquely Flexible HPC Resource for New Communities and Data Analytics”, Nystrom, N. A., Levine, M. J., Roskies, R. Z., and Scott, J. R. 2015 (submitted). In Proceedings of the 2015 Annual Conference on Extreme Science and Engineering Discovery Environment (St. Louis, MO, July 26-30, 2015). XSEDE15. ACM, New York, NY, USA. DOI=http://dx.doi.org/10.1145/2792745.2792775.
  • XSEDE: Accelerating Scientific Discovery",  with John Towns, Timothy Cockerill, Maytal Dahan, Ian Foster, Kelly Gaither, Andrew Grimshaw, Victor Hazlewood, Scott Lathrop, Dave Lifka, Gregory D. Peterson, J. Ray Scott, Nancy Wilkins-Diehr, Computing in Science & Engineering, vol.16, no. 5, 62-74, doi:10.1109/MCSE.2014.80 (2014)
  • "Loop Representations of the Quark Determinant in Lattice QCD," R. Roskies, A. Duncan, E. Eichten, H. Thacker, Phys. Rev. D60, 54505, (1999).
  • "Analytic Evaluation of Sixth Order Contribution to the Electron's g Factor," R. Roskies, M. J. Levine & E. Remiddi, Quantum Electrodynamics ed. T. Kinoshita, World Scientific, (1990).
  • "Lanczos Calculation of the Spectrum of Hamiltonian Lattice Gauge Theory," R. Roskies, J. W. Choe, A. Duncan, Phys. Rev. D37, 472, (1988).