Hai Ah Nam

Hai Ah Nam, Ph.D.

HPC Dept. Head, NERSC-10 Project Director

HNam@lbl.gov

Lawrence Berkeley National Laboratory

1 Cyclotron Road

M/S 59R3103

Berkeley, CA 94720

Biographical Sketch

Hai Ah is the High Performance Computing (HPC) Department head and NERSC-10 project director. Previously, she was a staff member of the Advanced Technologies Group (ATG), specializing in high performance computing, benchmarking, and performance analysis.

Prior to joining Berkeley Lab, her scientific career spanned three DOE national laboratories (LLNL, ORNL, and LANL), where she contributed to work in low-energy nuclear physics, computational physics, high performance computing, and research scientific software to impact NNSA mission-focused advanced simulation and computing (ASC) projects and scientific discovery-focused Office of Science projects. While at LANL, Hai Ah led the Advanced Technology Systems Center of Excellence efforts and supported multi-physics codes to run efficiently on these systems.

Hai Ah earned a Ph.D. in Computational Science from Claremont Graduate University and San Diego State University, an M.S. in Physics from Carnegie Mellon University, and a B.A. in Physics from Scripps College.

Hai Ah's research interests include emerging technologies for the high performance computing ecosystem, the science needs driving requirements, and the substantial interdisciplinary effort to bring technologies from design to production readiness.

Journal Articles

Nan Ding, Pieter Maris, Hai Ah Nam, Taylor Groves, Muaaz Gul Awan, LeAnn Lindsey, Christopher Daley, Oguz Selvitopi, Leonid Oliker, Nicholas Wright, Samuel Williams, "Evaluating the potential of disaggregated memory systems for HPC applications", Concurrency and Computation: Practice and Experience, May 2024,

Jeffrey C. Carver,Nasir Eisty, Hai Ah Nam, Irina Tezaur, "Special Issue on the Future of Research Software Engineers in the United States—Part II", Computing in Science & Engineering ( Volume: 24, Issue: 6, Nov.-Dec. 2022), June 2023, doi: 10.1109/MCSE.2023.3267696

Jeffrey C. Carver;,Nasir Eisty, Hai Ah Nam, Irina Tezaur, "Special Issue on the Future of Research Software Engineers in the United States—Part I", IEEE Computing in Science & Engineering ( Volume: 24, Issue: 5, Sept.-Oct. 2022), May 2023, doi: 10.1109/MCSE.2023.3261221

Smith, J. S. and Nebgen, B. and Mathew, N. et al., "Automated discovery of a robust interatomic potential for aluminum", February 23, 2021, doi: 10.1038/s41467-021-21376-0

P. Maris, J.P. Vary, P. Navratil, W.E. Ormand, H. Nam, D.J. Dean, Origin of the anomalous long lifetime of 14C, "Origin of the anomalous long lifetime of 14C", Phys. Rev. Lett. 105, 202502 (2011), 2021,

Hai Ah Nam, Elsa Gonsiorowski, Grigori Fursin, Lorena A. Barba, "Special Issue on the SC’18 Student Cluster Competition Reproducibility Initiative, Parallel Computing, Volume 90, 2019", Parallel Computing, Volume 90, 2019, December 2019,

Hai Ah Nam, Gabriel Rockefeller, Mike Glass, Shawn Dawson, John Levesque, Victor Lee, "The Trinity Center of Excellence Co-Design Best Practices", Computing in Science & Engineering, vol. 19, pp. 19-26, September/October 2017, September 2017,

S. Bogner,A. Bulgac, J. Carlson, J. Engel, G. Fann, R.J. Furnstahl, S. Gandolfi, G. Hagen, M. Horoi, C. Johnson, M. Kortelainen, E. Lusk, P. Maris, H. Nam, P. Navratil, W. Nazarewicz, E. Ng, G.P.A. Nobre, E. Ormand, T. Papenbrock, J. Pei, S.C. Pieper, S. Quaglioni, K.J. Roche, J. Sarich, N. Schunck, M. Sosonkina, J. Terasaki, I. Thompson, J.P. Vary, S.M. Wild, "Computational nuclear quantum many-body problem: The UNEDF project", CPC 184 2235-2250 (2013), October 1, 2013,

H. Nam and D.J. Dean, "Re-entrance in nuclei: competitive phenomena", J. Phys.: Conf. Ser. 445 012029 (2013), July 2013,

M. V. Stoitsov, N. Schunck, M. Kortelainen, N. Michel, H. Nam, E. Olsen, J. Sarich, S. Wild, "Axially deformed solution of the Skyrme-Hartree-Fock-Bogolyubov equations using the transformed harmonic oscillator basis (II)", HFBTHO v2.00c: a new version of the program, arXiv:1210.1825 [nucl-th], 2013,

D. Duke, H. Carr, A. Knoll, N. Schunck, H. Nam, A. Staszczak,, "Visualizing Nuclear Scission Through a Multifield Extension of Topological Analysis", IEEE Trans. Visualization and Computer Graphics, vol. 18, no. 12, pp. 2033-2040, Dec. 2012, December 1, 2012,

D. A. Pigg, G. Hagen, H. Nam, T. Papenbrock, "Time-dependent coupled-cluster method for atomic nuclei", Phys. Rev. C 86, 014308 (2012), July 2012,

H. Nam, M. Stoitsov, W. Nazarewicz, A. Bulgac, G. Hagen, M. Kortelainen, P. Maris, J. C. Pei, K. J. Roche, N. Schunck, I. Thompson, J. P. Vary, S. M. Wild
J., "UNEDF: Advanced Scientific Computing Collaboration Transforms the Low-Energy Nuclear Many-Body Problem", Phys.: Conf. Ser. 402 012033, 2012,

P. Maris, J.P. Vary, P. Navratil, W.E. Ormand, H. Nam, D.J. Dean, "Origin of the anomalous long lifetime of 14C", Phys. Rev. Lett. 105, 202502, 2011,

D.J. Dean, K. Langanke, H. Nam, and W. Nazarewicz, Reentrance Phenomenon in Heated Rotating Nuclei in the Shell Model Monte Carlo Approach, Phys. Rev. Lett. 105, 212504 (2010), "Reentrance Phenomenon in Heated Rotating Nuclei in the Shell Model Monte Carlo Approach", Phys. Rev. Lett. 105, 212504, November 2010,

Fernando Fuentes, Houssain Kettani, George Ostrouchov, Mario Stoitsov, Hai Ah Nam, "Exploration of High-Dimensional Nuclei Data", ICCSN, pp.521-524, 2010 Second International Conference on Communication Software and Networks, February 2010,

Calvin W. Johnson, Hai Ah Nam, "New puzzle for many-body systems with random two-body interactions", Phys. Rev. C, 2007, 75:047305, doi: 10.1103/PhysRevC.75.047305

Calvin W. Johnson and Hai Ah Nam, "Collective behavior in random interaction", Revista Mexicana de Fisica S 52(4) (2006) 44-48, November 2006,

Conference Papers

Ermal Rrapaj, Sridutt Bhalachandra, Zhengji Zhao, Brian Austin, Hai Ah Nam, Nicholas J. Wright, "Power Consumption Trends in Supercomputers: A Study of NERSC's Cori and Perlmutter Machines", ISC High Performance 2024 Research Paper Proceedings (39th International Conference), pp.1-10, 2024., May 12, 2024,

Zhengji Zhao, Ermal Rrapaj, Sridutt Bhalachandra, Brian Austin, Hai Ah Nam, Nicholas Wright, "Power Analysis of NERSC Production Workloads", In Proceedings of the SC '23 Workshops of The International Conference on High Performance Computing, Network, Storage, and Analysis (SC-W '23), New York, NY, USA, Association for Computing Machinery, November 2023, 1279-1287, doi: 10.1145/3624062.3624200

Anish Govind, Sridutt Bhalachandra, Zhengji Zhao, Ermal Rrapaj, Brian Austin, and Hai Ah Nam, "Comparing Power Signatures of HPC Workloads: Machine Learning vs Simulation", In Proceedings of the SC '23 Workshops of The International Conference on High Performance Computing, Network, Storage, and Analysis (SC-W '23)., New York, NY, USA, Association for Computing Machinery, November 2023, 1890-1893, doi: 10.1145/3624062.3624274

Nan Ding, Samuel Williams, Hai Ah Nam, Taylor Groves, Muaaz Gul Awan, LeAnn Lindsey, Christopher Daley, Oguz Selvitopi, Leonid Oliker, Nicholas Wright, "Methodology for Evaluating the Potential of Disaggregated Memory Systems", 2022 IEEE/ACM International Workshop on Resource Disaggregation in High-Performance Computing (REDIS), November 2022, doi: 10.1109/RESDIS56595.2022.00006

Taylor Groves, Chris Daley, Rahulkumar Gayatri, Hai Ah Nam, Nan Ding, Lenny Oliker, Nicholas J. Wright, Samuel Williams, "A Methodology for Evaluating Tightly-integrated and Disaggregated Accelerated Architectures", 2022 IEEE/ACM International Workshop on Performance Modeling, Benchmarking and Simulation of High Performance Computer Systems (PMBS), November 2022, doi: 10.1109/PMBS56514.2022.00012

K. Z. Ibrahim, T. Nguyen, H. Nam, W. Bhimji, S. Farrell, L. Oliker, M. Rowan, N. J. Wright, Williams, "Architectural Requirements for Deep Learning Workloads in HPC Environments", 2021 International Workshop on Performance Modeling, Benchmarking and Simulation of High Performance Computer Systems (PMBS), IEEE, November 2021, doi: 10.1109/PMBS54543.2021.00007

Nasir U. Perez Eisty, "Testing Research Software: A Case Study", Computational Science -- ICCS 2020, Cham, Springer International Publishing, 2020, 457--463,

K.S. Hemmert, S.G. Moore, M.A. Gallis, M.E. Davis, J. Levesque, N. Hjelm, J. Lujan, D. Morton, H. Nam, A. Parga, P. Peltz, G. Shipman, A. Torrez, "Trinity: Opportunities and Challenges of a Heterogeneous System", Proceedings of the Cray Users Group Conference, Stockholm, Sweden, May 2018,

K.S. Hemmert, M. Rajan, R. Hoekstra, M.W. Glass, S.D. Hammond, S. Dawson, M. Vigil, D. Grunau, J. Lujan, D. Morton, H. Nam, P. Peltz Jr., A. Torrez, C. Wright, "Trinity: Architecture and Early Experience", Proceedings of the Cray Users Group Conference, London, UK, May 2016,

Stephen Lien Harrell, Hai Ah Nam, Ver\ onica G. Vergara Larrea, Kurt Keville, Dan Kamalic, "Student Cluster Competition: A Multi-Disciplinary Undergraduate HPC Educational Tool", EduHPC 15, New York, NY, USA, Association for Computing Machinery, 2015, doi: 10.1145/2831425.2831428

S. Parete-Koon, B. Caldwell, S. Canon, E. Dart, J. Hick, J. Hill, C. Layton, D. Pelfrey, G. Shipman, D. Skinner, H. Nam, J. Wells, J. Zurawski, "HPC’s Pivot to Data", Proceedings of the Cray Users Group Conference, Lugano, Switzerland, May 2014,

Hai Ah Nam, Jason Hill, Suzanne Parete-Koon, "The Practical Obstacles of Data Transfer: Why Researchers Still Love Scp", NDM 13, New York, NY, USA, Association for Computing Machinery, 2013, doi: 10.1145/2534695.2534703

G. Hagen and H. Nam, "Computational aspects of nuclear coupled-cluster theory", Proceedings of the Yukawa International Seminar 2011 (YKIS2011) and Long-Term Workshop on Dynamics and Correlations in Exotic Nuclei (DCEN2011), October 2011,

M. Stoitsov, H. Nam, W. Nazarewicz, A. Bulgac, G. Hagen, M. Kortelainen, J. C. Pei, K. J. Roche, N. Schunck, I. Thompson, J.P. Vary, S. M. Wild, "UNEDF: Advanced Scientific Computing Transforms the Low-Energy Nuclear Many-Body Problem", Proceedings for SciDAC 2011, Denver, CO, July 2011,

Rebecca J. Hartman-Baker, Hai Ah Nam, "Optimizing Nuclear Physics Codes on the XT5", Proceedings of CUG 2011, 2011,

H. Nam, D. J. Dean, J.P. Vary, and P. Maris, "Computing Atomic Nuclei on the Cray XT5", Proceedings of the Cray Users Group Conference, Atlanta, GA, May 2009,

Book Chapters

Ang, JA, Cook, J, Domino, SP, Glass, MW, Hammond, SD, Hemmert, KS, Heroux, Hoekstra, RJ, Laros III, JH, Lin, PT, Nam, H, Neely, R, Rodrigues, AF, Trott, CR, "Exascale Co-design Progress and Accomplishments.", "Advances in Parallel Computing series," Fox, G, Getov, V, Grandinetti, L, Joubert, G, Sterling, T (Eds.), Convergence of Big Data and High-Performance Computing, IOS Press, Amsterdam, New York, Tokyo, SAND2017-8788B, ( 2016)

Presentation/Talks

Zhengji Zhao, Ermal Rrapaj, Sridutt Bhalachandra, Brian Austin, Hai Ah Nam, Nicholas Wright, Power Analysis of NERSC Production Workloads, A talk presented at the SC '23 Workshops of The International Conference on High Performance Computing, Network, Storage, and Analysis (SC-W '23), November 12, 2023,

H. Nam, D. Rouson, K. Niemeyer, N. Eisty, C. Rubio-Gonzalez, SIAM CSE21 Minisymposium: Better Scientific Software Fellowship, SIAM CSE 2021. https://www.siam.org/conferences/cm/conference/cse21, March 1, 2021,

H. Nam, Trinity Center of Excellence: "I Can't Promise to Solve All of Your Problems, but I Can Promise You Won't Face Them Alone", Salishan Conference 2017, April 2017,

Reports

Heroux, Michael A. and McInnes, Lois and Bernholdt, David and Dubey, Anshu and Gonsiorowski, Elsa and Marques, Osni and Moulton, J. David and Norris, Boyana and Raybourn, Elaine and Balay, Satish and Bartlett, Roscoe A. and Childers, Lisa and Gamblin, Todd and Grubel, Patricia and Gupta, Rinku and Hartman-Baker, Rebecca and Hill, Judith and Hudson, Stephen and Junghans, Christoph and Klinvex, Alicia and Milewicz, Reed and Miller, Mark and Ah Nam, Hai and O Neal, Jared and Riley, Katherine and Sims, Ben and Schuler, Jean and Smith, Barry F. and Vernon, Louis and Watson, Gregory R. and Willenbring, James and Wolfenbarger, Paul, "Advancing Scientific Productivity through Better Scientific Software: Developer Productivity and Software Sustainability Report", https://www.osti.gov/biblio/1606662/, February 2020,

W. Joubert, D. Kothe, H. Nam, "Preparing for Exascale: ORNL Leadership Computing Facility Application Requirements and Strategy", https://www.olcf.ornl.gov/olcf-media/center-reports/, December 2009,

Web Articles

"Better Scientific Software (BSSw) Blogs", H. Nam, Better Scientific Software (https://bssw.io/), 2021,