Recent Publications

• M. Adams, S. Ku, P. Worley, E. D'Azevedo, J. Cummings, and C-S. Chang, Scaling to 150K cores: recent algorithm and performance engineering developments enabling XGC1 to run at scale, Journal of Physics: Conference Series, 180 (2009) 012036. (Proceedings of SciDAC 2009, San Diego, CA, July 14-18, 2009.) (1051641 bytes)
• C-S. Chang, S. Ku, P. Diamond, M. Adams, R. Barreto, Y. Chen, J. Cummings, E. D'Azevedo, G. Dif-Pradalier, S. Ethier, L. Greengard, T. Hahm, F. Hinton, D. Keyes, S. Klasky, Z. Lin, J. Lofstead, G. Park, S. Parker, N. Podhorszki, K. Schwan, A. Shoshani, D. Silver, M. Wolf, H. Weitzner, P. Worley, E. Yoon, and D. Zorin, Whole-volume integrated gyrokinetic simulation of plasma turbulence in realistic diverted-tokamak geometry, Journal of Physics: Conference Series, 180 (2009) 012057. (Proceedings of SciDAC 2009, San Diego, CA, July 14-18, 2009.) (863732 bytes)
• B. de Supinski, S. Alam, D. Bailey, L. Carrington, C. Daley, A. Dubey, T. Gamblin, D. Gunter, P. Hovland, H. Jagode, K. Karavanic, G. Marin, J. Mellor-Crummey, S. Moore, B. Norris, L. Oliker, C. Olschanowsky, P. Roth, M. Schulz, S. Shende, A. Snavely, W. Spear, M. Tikir, J. Vetter, P. Worley, and N. Wright, Modeling the Office of Science Ten Year Facilities Plan: The PERI Architecture Tiger Team, Journal of Physics: Conference Series, 180 (2009) 012039. (Proceedings of SciDAC 2009, San Diego, CA, July 14-18, 2009.) (968824 bytes)
• R. Mills, F. Hoffman, P. Worley, K. Perumalla, A. Mirin, G. Hammond, and B. Smith, Coping at the User-Level with Resource Limitations in the Cray Message Passing Toolkit MPI at Scale: How Not to Spend Your Summer Vacation, in Proceedings of the 51st Cray User Group Conference, Atlanta, GA, May 4-7, 2009. (205513 bytes)
• P. Worley, R. Barrett, and J. Kuehn, Early Evaluation of the Cray XT5, in Proceedings of the 51st Cray User Group Conference, Atlanta, GA, May 4-7, 2009. (1111556 bytes)

• S. Alam, R. Barrett, M. Bast, M. Fahey, J. Kuehn, C. McCurdy, J. Rogers, P. Roth, R. Sankaran, J. Vetter, P. Worley, and W. Yu, Early Evaluation of IBM BlueGene/P, in Proceedings of the ACM/IEEE International Conference for High Performance Computing, Networking, Storage and Analysis (SC08), Austin, TX, November 15-21, 2008. (843324 bytes)
• J. Cary, J. Candy, R. Cohen, S. Krasheninnikov, D. McCune, D. Estep, J. Larson, A. Malony, A. Pankin, P. Worley, J. Carlsson, A. Hakim, P. Hamill, S. Kruger, M. Miah, S. Muzsala, A. Pletzer, S. Shasharina, D. Wade-Stein, N. Wang, S. Balay, L. McInnes, H. Zhang, T. Casper, L. Diachin, T. Epperly, T. Rognlien, M. Fahey, J. Cobb, A. Morris, S. Shende, G. W. Hammett, K. Indireshkumar, D. Stotler, A. Yu Pigarov First results from core-edge parallel composition in the FACETS project, Journal of Physics: Conference Series, 125 (2008) 012040. (Proceedings of SciDAC 2008, Seattle, WA, July 13-17, 2008.) (892917 bytes)
• C-S. Chang, S. Klasky, J. Cummings, R. Samtaney, A. Shoshani, L. Sugiyama, D. Keyes, S. Ku, G. Park, S. Parker, N. Podhorszki, H. Strauss, H. Abbasi, M. Adams, R. Barreta, G. Bateman, K. Bennett, Y. Chen, E. D'Azevedo, C. Docan, S. Ethier, E. Feibush, L. Greengard, T. Hahm, F. Hinton, C. Jin, A. Khan, A. Kritz, P. Krsti, T. Lao, W. Lee, Z. Lin, J. Lofstead, P. Mouallem, M, Nagappan, A. Pankin, M. Parashar, M. Pindzola, C. Reinhold, D. Schultz, K. Schwan, D. Silver, A. Sim, D. Stotler, M. Vouk, M. Wolf, H. Weitzner, P. Worley, Y. Xiao, E. Yoon, and D. Zorin, Toward a first-principles integrated simulation of tokamak edge plasmas, Journal of Physics: Conference Series, 125 (2008) 012042. (Proceedings of SciDAC 2008, Seattle, WA, July 13-17, 2008.) (1328182 bytes)
• S. Alam, R. Barrett, M. Eisenbach, M. Fahey, R. Hartman-Baker, J. Kuehn, S. Poole, R. Sankaran, and P. Worley, The Cray XT4 Quad-core : A First Look, in Proceedings of the 50th Cray User Group Conference, Helsinki, Finland, May 5-8, 2008. (1128950 bytes)
• J. White III, K. Evans, R. Archibald, J.Drake, P. Worley, and D. Kothe, Acceleration of Time Integration, in Proceedings of the 50th Cray User Group Conference, Helsinki, Finland, May 5-8, 2008. (159417 bytes)
• P. H. Worley, Early Evaluation of the IBM BG/P, in Proceedings of the LCI International Conference on High Performance Clustered Computing, National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Urbana, IL, April 29 - May 1, 2008. (Winner of Best Paper Award) (452637 bytes)
• S. R. Alam, R. F. Barrett, M. R. Fahey, J. A. Kuehn, O. E. Messer, R. T. Mills, P. C. Roth, J. S. Vetter, and P. H. Worley, An Evaluation of the ORNL Cray XT3, International Journal for High Performance Computer Applications, 22, February 2008, pp. 52-80. (2432223 bytes)
• J. B. Drake, P. W. Jones, M. Vertenstein, J. B. While III, and P. H. Worley, Software Design for Petascale Climate Science, in Petascale Computing: Algorithms and Applications, ed. D. Bader, Chapman & Hall / CRC Press, Taylor and Francis Group, 2008. (355862 byes)
• J. B. Drake, P. H. Worley, and E. F. D'Azevedo, Spherical Harmonic Transform Algorithms, ACM Transactions on Mathematical Software, 35 (3), 2008. (457742 bytes)

• P. Colella, D. Keyes, P. Worley, J. Candy, L. Chacon, G. Fann, W. Gropp, C. Kamath, V. Pascucci, R. Samtaney, and J. Shalf, Mathematical and Computational Enabling Technologies, in 2007 DOE Fusion Simulation Project Workshop Report, eds. A. Kritz and D. Keyes, http://www.science.doe.gov/ofes/programdocuments/reports/FSPWorkshopReport.pdf, Chapter 5, pp. 71-94. (2840014 bytes)
• S. R. Alam, R. F. Barrett, M. R. Fahey, J. A. Kuehn, J. M. Larkin, R. Sankaran, and P. H. Worley, Cray XT4: An Early Evaluation for Petascale Scientific Simulation, in Proceedings of the ACM/IEEE International Conference for High Performance Computing, Networking, Storage and Analysis (SC07), Reno, NV, November 10-16, 2007. (1042890 bytes)
• K. Raghavachar, G. Mahinthakumar, P. Worley, E. Zechman, R. Ranjithan, Parallel Performance Modeling using a Genetic Programming-based Error Correction Procedure, SIMULATION, 83 (7), 2007, pp. 515-527. (253387 bytes)
• J. R. Cary, J. Candy, R. H. Cohen, S. Krasheninnikov, D. C. McCune, D. J. Estep, J. Larson, A. D. Malony, P. H. Worley, J. A. Carlsson, A. H. Hakim, P. Hamill, S. Kruger, S. Muzsala, A. Pletzer, S. Shasharina, D. Wade-Stein, N. Wang, L. McInnes, T. Wildey, T. Casper, L. Diachin, T. Epperly, T. D. Rognlien, M. R. Fahey, J. A. Kuehn, A. Morris, S. Shende, E. Feibush, G. W. Hammett, K. Indireshkumar, C. Ludescher, L. Randerson, D. Stotler, A. Yu Pigarov, P. Bonoli, C. S. Chang, D. A. D'Ippolito, P. Colella, D. E. Keyes, R. Bramley, J. R. Myra, Introducing FACETS, the Framework Application for Core-Edge Transport Simulations, in Proceedings of SciDAC 2007, Boston, MA, June 24-28, 2007. (470182 bytes)
• A. A. Mirin and P. H. Worley, Extending Scalability of the Community Atmosphere Model, Journal of Physics: Conference Series, 78 (2007) 012082. (Proceedings of SciDAC 2007, Boston, MA, June 24-28, 2007.) (528161 bytes)
• B. R. de Supinski, J. K. Hollingsworth, S. Moore, and P. H. Worley, Results of the PERI Survey of SciDAC Applications, Journal of Physics: Conference Series, 78 (2007) 012027. (Proceedings of SciDAC 2007, Boston, MA, June 24-28, 2007.) (709459 bytes)
• P. H. Worley, Comparison of Cray XT3 and XT4 Scalability, in Proceedings of the 49th Cray User Group Conference, Seattle, WA, May 7-10, 2007. (546957 bytes)

• C. S. Chang, S. Ku, M. Adams, E. D'Azevedo, Y. Chen, J. Cummings, S. Ethier, L. Greengard,. T. S. Hahm, F. Hinton, D. Keyes, S. Klasky, W. W. Lee, Z. Lin, Y. Nishimura, S. Parker, R. Samtaney, D. Stotler, H. Weitzer, P. Worley, D. Zorin, and the CPES Team, Integrated particle simulation of neoclassical and turbulence physics in the tokamak pedestal/edge region using XGC, in Proceedings of the 21st IAEA Fusion Energy Conference, Chengdu, China, October 16-21, 2006. (522331 bytes)
• P. Worley, A. Mirin, J. Drake, and W. Sawyer, Performance Engineering in the Community Atmosphere Model, Journal of Physics: Conference Series, 46 (2006), pp. 356-362. (Proceedings of the 2006 SciDAC Conference, Denver, CO, June 26-9, 2006.) (256293 bytes)
• S. R. Alam, R. F. Barrett, M. R. Fahey, O. E. Messer, R. T. Mills, P. C. Roth, J. S. Vetter, and P. H. Worley, Evaluation of the Cray XT3 at ORNL: a Status Report, in Proceedings of the 48th Cray User Group Conference, Lugano, Switzerland, May 8-11, 2006. (1437611 bytes)
• P. H. Worley, Performance of the Community Atmosphere Model on the Cray X1E and XT3, in Proceedings of the 48th Cray User Group Conference, Lugano, Switzerland, May 8-11, 2006. (394016 bytes)
• K. Raghavachar, G. Mahinthakumar, P. Worley, E. Zechman, R. Ranjithan, Parallel Performance Modeling using a Genetic Programming Based Error Correction Procedure, in Proceedings of the High Performance Computing Symposium (HPC 2006), Huntsville, AL, April 2-6, 2006. (135406 bytes)
• P. H. Worley, Benchmarking using the Community Atmospheric Model, in Proceedings of the 2006 SPEC Benchmark Workshop, Austin, TX, January 23, 2006. (107868 bytes)

• L. Oliker, J. Carter, M. Wehner, A. Canning, S. Ethier, A. Mirin, G. Bala, D. Parks, P. Worley, S. Kitawaki, and Y. Tsuda, Leading Computational Methods on Scalar and Vector HEC Platforms, in Proceedings of the ACM/IEEE International Conference for High Performance Computing, Networking and Storage (SC05), Seattle, WA, November 12-18, 2005. (8477437 bytes)
• P. W. Jones, P. H. Worley, Y. Yoshida, J. B. White III, and J. Levesque, Practical performance portability in the Parallel Ocean Program (POP), Concurrency: Practice and Experience, 17(10), August 2005, pp. 1317-1327. (208462 bytes)
• P. H. Worley and J. B. Drake, Performance Portability in the Physical Parameterizations of the Community Atmospheric Model, International Journal for High Performance Computer Applications, 19(3), August 2005, pp. 187-202. (337895 bytes)
• P. Worley, J. Candy, L. Carrington, K. Huck, T. Kaiser, G. Mahinthakumar, A. Maloney, S. Moore, D. Reed, P. Roth, H. Shan, S. Shende, A. Snavely, S. Sreepathi, F. Wolf, and Y. Zhang, Performance Analysis of GYRO: A Tool Evaluation, Journal of Physics: Conference Series, 16 (2005), pp. 551-555. (Proceedings of the 2005 SciDAC Conference, San Francisco, CA, June 26-30, 2005.) (176202 bytes)
• T. H. Dunigan, Jr., J. S. Vetter, and P. H. Worley Performance Evaluation of the SGi Altix 3700, in Proceedings of the 2005 International Conference on Parallel Processing, Oslo, Norway, June 14-17, 2005. (628999 bytes)
• G. R. Carr, M. J. Cordery, J. B. Drake, M. W. Ham, F. M. Hoffman, and P. H. Worley, Porting and Performance of the Community Climate System Model (CCSM3) on the Cray X1, in Proceedings of the 47th Cray User Group Conference, Albuquerque, NM, May 16-19, 2005. (300342 bytes)
• M. R. Fahey, S. Alam, T. H. Dunigan, Jr., J. S. Vetter, and P. H. Worley, Early Evaluation of the Cray XD1, in Proceedings of the 47th Cray User Group Conference, Albuquerque, NM, May 16-19, 2005. (274890 bytes)
• J. S. Vetter, S. R. Alam, T. H. Dunigan, Jr., M. R. Fahey, P. C. Roth, and P. H. Worley, Early Evaluation of the Cray XT3 at ORNL, in Proceedings of the 47th Cray User Group Conference, Albuquerque, NM, May 16-19, 2005. (891255 bytes)
• P. H. Worley, S. Alam, T. H. Dunigan, Jr., M. R. Fahey, and J. S. Vetter, Comparative Analysis of Interprocess Communication on the X1, XD1, and XT3, in Proceedings of the 47th Cray User Group Conference, Albuquerque, NM, May 16-19, 2005. (1651224 bytes)
• T. H. Dunigan, Jr., J. S. Vetter, J. B. White III, and P. H. Worley, Performance Evaluation of the Cray X1 Distributed Shared-Memory Architecture, IEEE Micro, 25(1), January/February 2005, pp. 30-40. (931198 bytes)

• G. R. Carr, I. L. Carpenter, M. J. Cordery, J. B. Drake, M. W. Ham, F. M. Hoffman, and P. H. Worley, Porting and Performance of the Community Climate System Model (CCSM3) on the Cray X1, in Proceedings of the 11th Workshop on High Performance Computing in Meteorology, Reading, UK, October 25-29-19, 2004, eds. W. Zwieflhofer and G. Mozdzynski, World Scientific, Fall, 2005.
• P. Agarwal, J. Ahrens, D. Bauer, R. Bleck, P. Chandramohan, T. Dunigan, G. Fann, M. Guest, F. Jaeger, G. Kora, R. Latham, V. Meunier, L. Oliker, R. Ross, N. Samatova, A. Shoshani, S. Studham, B. Sumpter, R. Thakur, R. Toedte, J. S. Vetter, P. H. Worley, and D. Xu, Evaluation of the SGI Altix 3700 at Oak Ridge National Laboratory, ORNL Technical Report, November,2004. (1368892 bytes)
• P. K. Agarwal, R. A. Alexander, E. Apra, S. Balay, A. S. Bland, J. Colgan, E. F. D'Azevedo, J. J. Dongarra, T. H. Dunigan, Jr., M. R. Fahey, R. A. Fahey, A. Geist, M. Gordon, R. J. Harrison, D. Kaushik, M. Krishnakumar, P. Lusczek, A. Mezzacappa, J. A. Nichols, J. Nieplocha, L. Oliker, T. Packwood, M. S. Pindzola, T. C. Shulthess, J. S. Vetter, J. B. White III, T. L. Windus, P. H. Worley, T. Zacharia, ORNL Cray X1 Evaluation Status Report, in Proceedings of the 46th Cray User Group Conference, Knoxville, TN, May 17-21, 2004. (584054 bytes)
• F. M. Hoffman, M. Vertenstein, H. Kitabata, J. B. White III, P. H. Worley, J. B. Drake, M. Cordery, Adventures in Vectorizing the Community Land Model, in Proceedings of the 46th Cray User Group Conference, Knoxville, TN, May 17-21, 2004. (186380 bytes)
• J. B. Drake, P. H. Worley, I. Carpenter, M. Cordery, Experience with the Full CCSM, in Proceedings of the 46th Cray User Group Conference, Knoxville, TN, May 17-21, 2004. (192691 bytes)
• P. H. Worley, J. Levesque, The Performance Evolution of the Parallel Ocean Program on the Cray X1, in Proceedings of the 46th Cray User Group Conference, Knoxville, TN, May 17-21, 2004. (3832043 bytes)
• G. Mahinthakumar, M. Sayeed, J. Blondin, P. Worley, W. Hix, A. Mezzacappa, Performance Evaluation and Modeling of a Parallel Astrophysics Application, in Proceedings of the High Performance Computing Symposium 2004, p. 27-33, Ed: Joerg Meyer, The Society for Modeling and Simulation International, ISBN 1-56555-278-4, Arlington, VA. (209036 bytes)
• P. K. Agarwal, R. A. Alexander, E. Apra, S. Balay, A. S. Bland, J. Colgan, E. F. D'Azevedo, J. J. Dongarra, T. H. Dunigan, Jr., M. R. Fahey, R. A. Fahey, A. Geist, M. Gordon, R. J. Harrison, D. Kaushik, M. Krishnakumar, P. Lusczek, A. Mezzacappa, J. A. Nichols, J. Nieplocha, L. Oliker, T. Packwood, M. S. Pindzola, T. C. Shulthess, J. S. Vetter, J. B. White III, T. L. Windus, P. H. Worley, T. Zacharia, ORNL Cray X1 Evaluation Status Report, ORNL Technical Report ORNL/TM-2004/13, January 29,2004. (836950 bytes)

• T. H. Dunigan, Jr., M. R. Fahey, J. B. White III, P. H. Worley, Early Evaluation of the Cray X1, in Proceedings of the ACM/IEEE Conference on High Performance Networking and Computing (SC03), Phoenix, AZ, November 15-21, 2003. (331411 bytes)
• P. H. Worley, T. H. Dunigan Early Evaluation of the Cray X1 at Oak Ridge National Laboratory, in Proceedings of the 45th Cray User Group Conference, Columbus, OH, May 12-16, 2003. (276330 bytes)

• J. S. Vetter, P. H. Worley, Asserting Performance Expectations, in Proceedings of the ACM/IEEE Conference on High Performance Networking and Computing (SC02), Baltimore, MD, November 16-22, 2002. (333391 bytes)
• P. H. Worley, Scaling the Unscalable: A Case Study on the AlphaServer SC, in Proceedings of the ACM/IEEE Conference on High Performance Networking and Computing (SC02), Baltimore, MD, November 16-22, 2002. (199069 bytes)
• P. H. Worley, T. H. Dunigan, Jr., M. R. Fahey, J. B. White III, A. S. Bland, Early Evaluation of the IBM p690, in Proceedings of the ACM/IEEE Conference on High Performance Networking and Computing (SC02), Baltimore, MD, November 16-22, 2002. (243912 bytes)

• P. H. Worley, Performance Evaluation of the IBM SP and the Compaq AlphaServer SC , in Proceedings of the ACM International Conference of Supercomputing 2000, Santa Fe, New Mexico, May 8 - 11, 2000. (216303 bytes)

• J. B. Drake, S. Hammond, R. James, P. H. Worley, Performance Tuning and Evaluation of a Parallel Community Climate Model, in Proceedings of the ACM/IEEE Conference on High Performance Networking and Computing (SC99), Portland, OR, November 13-19, 1999. (179645 bytes)
• P. H. Worley, Impact of Communication Protocol on Performance, ORNL Technical Report ORNL/TM-13682, February 1999. (579574 bytes)

• P. H. Worley, Impact of Communication Protocol on Performance, in Proceeedings of the Second International Workshop on Software Engineering and Code Design in Parallel Meteorological and Oceanographic Applications, Scottsdale, AZ, June 15 - 18, 1998, NASA Conference Publication 1998-206860 pp. 277-288. (366671 bytes)
• J. Brehm, P. H. Worley, and M. Madhukar, Performance Modeling for SPMD Message-Passing Programs, Concurrency: Practice and Experience, 10(5), April 1998, pp. 333-357. (370036 bytes)

• I. T. Foster and P. H. Worley, Parallel algorithms for the spectral transform method, SIAM J. Sci. Stat. Comput., 18(3), 1997, pp. 806-837. (Also ORNL Technical Report ORNL/TM-12507, April 1994.) (348249 bytes)
• J. Brehm and P. H. Worley, Performance Prediction for Complex Parallel Applications, in Proceeedings of the 11th International Parallel Processing Symposium, Geneva April 1st - 5th, 1997, IEEE Computer Society Press, pp. 187-192. (106148 bytes)

• I. T. Foster, B. Toonen, and P. H. Worley, Performance of parallel computers for spectral atmospheric models, J. Atm. Oceanic Tech., 13(5), 1996, pp. 1031-1045. (Also ORNL Technical Report ORNL/TM-12986, April 1995.) (228517 bytes)
• P. H. Worley, MPI performance evaluation and characterization using a compact application benchmark code, in Proccedings of the Second MPI Developers Conference and Users' Meeting, eds. A. Lumsdaine and A. Skjellum, IEEE Computer Society Press, 1996, pp. 170-177. (235363 bytes)
• J. B. Drake, R. E. Flanery, I. T. Foster, J. J. Hack, J. G. Michalakes, B. D. Semeraro, D. L. Williamson, and P. H. Worley, Parallel Community Climate Model: Description and User's Guide, ORNL Technical Report ORNL/TM-12285, May 1996. (312957 bytes)

• J. B. Drake, I. T. Foster, J. G. Michalakes, B. Toonen, and P. H. Worley, Design and Performance of a Scalable Parallel Community Climate Model, Parallel Computing, 21(10), October 1995, pp. 1571-1592. (255024 bytes)
• P. H. Worley and B. Toonen, A users' guide to PSTSWM, ORNL Technical Report ORNL/TM-12779, July 1995. (232512 bytes)
• G. Horton, S. Vandewalle, and P, H. Worley, An algorithm with polylog parallel complexity for solving parabolic partial differential equations, SIAM J. Sci. Stat. Comput., 16(3), May 1995, pp. 531-541. (199811 bytes)
• J. B. Drake, I. T. Foster, J. G. Michalakes, and P. H. Worley, Parallel algorithms for semi-Lagrangian transport in global atmospheric circulation models, in Proceedings of the Seventh SIAM Conference on Parallel Processing for Scientific Computing, eds. D. H. Bailey, P. E. Bjorstad, J. R. Gilbert, M. V. Mascagni, R. S. Schreiber, H. D. Simon, V. J. Torczon, and L. T. Watson, SIAM, 1995, pp. 119-124. (92502 bytes)
• P. H. Worley, I. T. Foster, and B. Toonen, Algorithm comparison and benchmarking using a parallel spectral transform shallow water model, in Proccedings of the Sixth Workshop on Parallel Processing in Meteorology, eds. G.-R. Hoffmann and N. Kreitz, World Scientific, Singapore, 1995, pp. 277-289. (124793 bytes)

• J. B. Drake, I. T. Foster, J. J. Hack, J. G. Michalakes, B. D. Semeraro, B. Toonen, D. L. Williamson, and P. H. Worley, PCCM2: A GCM adapted for scalable parallel computers, in Proceedings of the Fifth Global Change Symposium, American Meteorological Society, 1994, pp. 91-98. (258657 bytes)
• P. H. Worley and I. T. Foster, Parallel Spectral Transform Shallow Water Model: A runtime-tunable parallel benchmark code, in Proceedings of the Scalable High Performance Computing Conference, eds. J. J. Dongarra and D. W. Walker, IEEE Computer Society Press, 1994, pp. 207-214. (118239 bytes)

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Patrick H. Worley / (worleyph@ornl.gov)
Last Modified Monday, 24-Aug-2009 10:42:14 EDT.