Lex Wolters

Curriculum Vitae

Professional experience

Jan 1998 - present:

Associate Professor Computer Science, Leiden University.

Sep 1992 - Dec 1997:

Assistant Professor Computer Science, Leiden University.

Sep 1990 - Aug 1992:

Assistant Professor Computational Science, Utrecht University.

Sep 1989 - Aug 1990:

Research Associate, Department of Computer Science and Institute of Meteorology and Physical Oceanography, Utrecht University.

Jun 1985 - May 1989:

Research Associate, Department of Physics and Astronomy, Utrecht University.

Sep 1981 - Feb 1985:

Research Assistant, Department of Computer Science, Utrecht University.

1980, 1981, 1982:

Positions as Research Assistant, Faculty of Arts, Utrecht University.

Education

Research interests

Application drivers

Starting from a high level problem specification, which is as close as possible to the mathematical formulation, an application driver generates automatically an efficient program/code for a real-word large-scale application targeted to an user specified (high performance) computer architecture.

3D computer graphics

The applicability of virtual reality/scenery to present complex information (e.g., weather forecasts) in innovative, alternative ways, by which the information becomes more according to the world of one's experience.

Computational science

The modeling and simulation of (scientific) problems on (high performance) computer platforms, which should result in new unknown insights. From a computer science point of view this means to contribute to achieve the most efficient implementation of the specific problem.

Grid Computing

Quantum Computing

Other interests

Publications

• Hui Li, Michael Muskulus, and Lex Wolters, Modeling Correlated Workloads by Combining Model Based Clustering and A Localized Sampling Algorithm, in proceedings of 21st ACM International Conference on Supercomputing (ICS07), June 2007, Seattle, USA, ACM Press.
• Hui Li, Michael Muskulus, and Lex Wolters, A Novel Algorithm for Generating Correlated Workload Attributes, in proceedings of the 13th Annual Conference of the Advanced School for Computing and Imaging (ASCI), June 2007, Heijen, The Netherlands, pp 26-33.
• Jos Rohling, Lex Wolters, and Johanna H. Meijer, Simulation of Day-Length Encoding in the SCN, in proceedings of the 13th Annual Conference of the Advanced School for Computing and Imaging (ASCI), June 2007, Heijen, The Netherlands, pp 414-421.
• Hui Li, Michael Muskulus, and Lex Wolters, Modeling Long Range Dependent and Fractal Job Traffic in Data-Intensive Grids, Technical Report TR No. 2007-03, Leiden Institute of Advanced Computer Science (LIACS), Leiden University, April 2007.
• Hui Li, Richard Heusdens, Michael Muskulus, and Lex Wolters, Analysis and Synthesis of Pseudo-Periodic Job Arrivals in Grids: A Matching Pursuit Approach, in proceedings of 7th IEEE International Symposium on Cluster Computing and the Grid (CCGrid07), May 2007, Rio de Janeiro, Brazil, IEEE Computer Society Press, pp 183-196.
• Hui Li and Lex Wolters, Towards A Better Understanding of Workload Dynamics on Data-intensive Clusters and Grids, in proceedings of 21st IEEE International Parallel and Distributed Processing Symposium (IPDPS), March 2007, Long Beach, California, USA, IEEE Computer Society Press.
• Hui Li, David Groep, and Lex Wolters, Mining Performance data for metascheduling decision support in the Grid, Future Generation Computer Systems 23 (2007) 92-99.
• Hui Li, David Groep, Lex Wolters, and Jeff Templon, Job Failure Analysis and Its Implications in a Large-scale Production Grid, in proceedings of 2nd IEEE International Conference on e-Science and Grid Computing (eScience 2006), December 2006, Amsterdam, The Netherlands, p27.
• Jos Rohling, Lex Wolters, and Johanna H. Meijer, Simulation of Day-Length Encoding in the SCN: From Single Cell to Tissue Level Organization, Journal of Biological Rhythms, Vol. 21 No. 4, August 2006, pp 301-313.
• A. Iosup, C. Dumitrescu, D. Epema, H. Li, and L. Wolters, How Are Real Grids Used? The Analysis of Four Grid Traces and Its Implications, in proceedings of 7th IEEE/ACM International Conference on Grid Computing (Grid2006), Barcelona, Spain, 2006.
• Hui Li, Michael Muskulus, and Lex Wolters, Modeling Job Arrivals in a Data-Intensive Grid, in proceedings of 12th International Workshop on Job Scheduling Strategies for Parallel Processing (JSSPP 2006), Saint Malo, France, LNCS 4376, 2007, pp 210-231.
• Hui Li and Lex Wolters, An Investigation of Grid Performance Predictions through Statistical Learning, in proceedings of 1st Workshop on Tackling Computer System Problems with Machine Learning Techniques (SysML), in conjunction with ACM Sigmetrics, Saint-Malo, France, 2006.
• Hui Li, Juan Chen, Ying Tao, David Groep, and Lex Wolters, Improving a Local Learning Technique for Queue Wait Time Predictions, in proceedings of the 6th IEEE International Symposium on Cluster Computing and the Grid (CCGrid2006), May 2006, Singapore, pp 335-342.
• Jos Rohling, Lex Wolters, and Johanna H. Meijer, Simulations Of Day-Length Encoding in the SCN: From Single Cells to Tissue Level Organization, in proceedings of the 10th Biennial SRBR Meeting, May 2006, Sandestin (FL), USA, p81.
• Hui Li, David Groep, and Lex Wolters, Efficient Response Time Predictions by Exploiting Application and Resource State Similarities, in proceedings of the 6th IEEE/ACM International Workshop on Grid Computing (Grid2005), November 2005, Seattle, Washington, USA, pp 234-241.
• Jos Rohling, Henk Tjebbe van der Leest, Joke Meijer, and Lex Wolters, From single neuron activity to neuronal network properties in the circadian pacemaker of the SCN, in proceedings of the Annual Dutch meeting on Molecular and Cellular Biophysics, October 2005, Lunteren, The Netherlands.
• Hui Li, David Groep, and Lex Wolters, Mining Performance Data for Metascheduling Decision Support in the Grid, Technical Report 2005-07, LIACS, Leiden University, 2005.
• Haobo Zhou, Gerard Cats, and Lex Wolters, Evaluation of the HIRLAM Forecast module on the Grid environment DAS-2, Hirlam Newsletter 48, June 2005, pp 167-172.
• Hui Li, David Groep, and Lex Wolters, An Evaluation of Learning and Heuristic Techniques for Application Run Time Predictions, in proceedings of the 11th Annual Conference of the Advance School for Computing and Imaging (ASCI), June 2005, Heijen, The Netherlands, pp 241-248.
• Hui Li, David Groep, and Lex Wolters, Workload Characteristics of a Multi-cluster Supercomputer, in D. Feitelson, L. Rudolph, and U. Schiegelshohn (Eds.): proceedings of the 10th Workshop on Job Scheduling Strategies for Parallel Processing (JSSPP 2004), LNCS 3277, 2005, pp 176-193.
• Paul van der Mark, Gerard Cats, and Lex Wolters, A Dynamic Application-Driven Data Communication Strategy, in proceedings of the 18th ACM International Conference on Supercomputing, June 2004, Saint-Malo, France, ACM Press, pp 146-153.
• Hui Li, Lex Wolters, and David Groep, Workload Characteristics of the DAS-2 Supercomputer, in proceedings of the 10th Annual Conference of the Advanced School for Computing and Imaging (ASCI), June 2004, Ouddorp, The Netherlands, pp 251-258.
• Paul van der Mark, Lex Wolters, and Gerard Cats, Optimizing Data Communication for Semi-Lagrangian Formulations on a Distributed Memory Cluster, in proceedings of the 10th Annual Conference of the Advanced School for Computing and Imaging (ASCI), June 2004, Ouddorp, The Netherlands, pp 381-388.
• Hui Li, David Groep, Jeff Templon, and Lex Wolters, Predicting Job Start Times on Clusters, in proceedings of the 4th IEEE/ACM International Symposium on Cluster Computing and the Grid (CCGrid2004), April 2004, Chicago, Illinois, USA, pp 301-308.
• Paul van der Mark, Lex Wolters, and Gerard Cats, Semi-Lagrangian Formulations with Automatic Code Generation for Environmental Modeling, in proceedings of the 19th ACM Symposium on Applied Computing (SAC04), March 2004, Nicosia, Cyprus, ACM Press, pp 229-234.
• Paul van der Mark, Lex Wolters, and Gerard Cats, Code Generation for Semi-Lagrangian Formulations, in proceedings of the 2nd International Symposium on Parallel and Distributed Computing, October 2003, Ljubljana, Slovenia, IEEE Computer Society Press, pp 266-273.
• Paul van der Mark, Lex Wolters, and Gerard Cats, Automatic Code Generation for Semi-Lagrangian Formulations, in proceedings of the 9th Annual Conference of the Advanced School for Computing and Imaging (ASCI), June 2003, Heijen, The Netherlands, pp 216-224.
• Paul van der Mark, Lex Wolters, and Gerard Cats, Automatic Code Generation for a Convection Scheme, in proceedings of the 18th ACM Symposium on Applied Computing (SAC03), special track on Parallel and Distributed Systems and Networking, March 2003, Melbourne (FL), USA, ACM Press, pp 1003-1008.
• Paul van der Mark, Lex Wolters, and Gerard Cats, Automatic Code Generation for Large Scale Applications, in proceedings of the 10th International Workshop on Compilers for Parallel Computers (CPC03), January 2003, Amsterdam, The Netherlands, pp 157-164.
• Paul van der Mark, Gerard Cats, and Lex Wolters, Automatic Code Generation for a Turbulence Scheme, in proceedings of the 15th ACM International Conference on Supercomputing, June 2001, Sorrento, Italy, ACM Press, pp 252-259.
• Paul van der Mark, Gerard Cats, and Lex Wolters, Code Generation for a Turbulence Scheme, in proceedings of the Seventh Annual Conference of the Advanced School for Computing and Imaging (ASCI), May 2001, Heijen, The Netherlands, pp 383-390.
• Henri Bal et al, The distributed ASCI supercomputer project, ACM Special Interest Group, Operating Systems Review, Vol. 34, No. 4, 2000, pp 76-96.
• Robert van Engelen, Lex Wolters, and Gerard Cats, The Ctadel Application Driver, chapter 26 in Elias Houstis et al (eds.), Enabling Technologies for Computional Science - Frameworks, Middleware and Environments, Kluwer Academic Publ., ISBN 0792378091, 2000.
• Ilja Heitlager, Robert van Engelen, and Lex Wolters, The Construction of Flux-Limiting Advection Algorithms through Program Generation, Technical Report 98-04, Department of Computer Science, Leiden University, Februari 1998.
• Robert van Engelen and Lex Wolters, A High-Level Language and Interpreter for the Use of Mathematical Vector Notation in PDE-Problem Specifications, Technical Report 97-05, Department of Computer Science, Leiden University, October 1997.
• Robert A. van Engelen, Lex Wolters, and Gerard Cats, Tomorrow's Weather Forecast: Automatic Code Generation for Atmospheric Modeling, IEEE Computational Science & Engineering, Vol. 4, No. 3, 1997, pp 22-31.
• Robert A. van Engelen, Lex Wolters, and Gerard Cats, The Ctadel Application Driver for Numerical Weather Forecast Systems, in Achim Sydow (ed.) proceedings of the 15th IMACS World Congress on Scientific Computation, Modelling and Applied Mathematics, August 1997, Berlin, Germany, Wissenschaft & Technik Verlag, Volume 4, pp 571-576.
• Robert A. van Engelen, Ilja Heitlager, Lex Wolters, and Gerard Cats, Incorporating Application Dependent Information in an Automatic Code Generating Environment, in proceedings of the 11th ACM International Conference on Supercomputing, July 1997, Vienna, Austria, ACM Press, pp 180-187.
• Robert A. van Engelen, Lex Wolters, and Gerard Cats, PDE-Oriented Language Compilation and Optimization with Ctadel for Parallel Computing, in proceedings of the Second International Workshop on High-Level Parallel Programming Models and Supportive Environments (HIPS'97), April 1997, Geneva, Switzerland, IEEE Computer Society Press, pp 105-109.
• Gerard Cats and Lex Wolters, The Hirlam Project, IEEE Computational Science & Engineering, Vol. 3, No. 4, 1996, pp 4-7.
• Robert A. van Engelen, Lex Wolters, and Gerard Cats, Automatic Code Generating for High Performance Computing in Environmental Modeling, in proceedings of the International Eurosim Conference, June 1996, Delft, The Netherlands, pp 421-428.
• Robert A. van Engelen, Lex Wolters, and Gerard Cats, The Ctadel Code Generation Tool for PDE-based Scientific Applications, in proceedings of the Second Annual Conference of the Advanced School for Computing and Imaging (ASCI), June 1996, Lommel, Belgium, pp 120-125.
• Robert A. van Engelen, Lex Wolters, and Gerard Cats, Ctadel: A Generator of Multi-Platfom High Performance Codes for PDE-based Scientific Applications, in proceedings of the 10th ACM International Conference on Supercomputing, May 1996, Philadelphia, USA, ACM Press, pp 86-93.
• Lex Wolters, Robert A. van Engelen, and Gerard Cats, Automatic Code Generation: Ctadel, in proceedings of the 17th EWGLAM and SRNWP meeting, LAM Newsletter, Number 25, May 1996, pp 137-143.
• Robert A. van Engelen, Lex Wolters, and Gerard Cats, Multi-Platform Code Generation for the HIRLAM Dyn Routine with Ctadel, in proceedings of the HIRLAM workshop on Variational Data Assimilation, February 1996, De Bilt, The Netherlands, pp 115-122.
• Lex Wolters, Gerard Cats, Nils Gustafsson, and Tomas Wilhelmsson, Data-Parallel Numerical Methods in a Weather Forecast Model, Applied Numerical Mathematics 19 (1995) 159-171.
• Robert A. van Engelen, Lex Wolters, and Gerard Cats, Ctadel: A Generator of Efficient Code for PDE-based Scientific Applications, Technical Report 95-26, Department of Computer Science, Leiden University, September 1995.
• Robert A. van Engelen and Lex Wolters, A Comparison of Parallel Programming Paradigms and Data Distributions for a Limited Area Numerical Weather Forecast Routine, in proceedings of the 9th ACM International Conference on Supercomputing, July 1995, Barcelona, Spain, ACM Press, pp 357-364.
• Lex Wolters, Gerard Cats, and Nils Gustafsson, Data-Parallel Numerical Weather Forecasting, Scientific Programming 4 (1995) 141-153.
• Robert A. van Engelen and Lex Wolters, Parallelization of a Finite Difference Application: a Comparison of Parallel Programming Paradigms and Data Distributions, in proceedings of the First Annual Conference of the Advanced School for Computing and Imaging (ASCI), May 1995, Heijen, The Netherlands, pp 28-36.
• Lex Wolters, Gerard Cats, Nils Gustaffson, and Tomas Wilhelmsson, Dataparallel Semi-Lagrangian Numerical Weather Forecasting, in proceedings of Frontiers '95, the Fifth Symposium on the Frontiers of Massively Parallel Computation, February 1995, McLean, Virginia, USA, IEEE Computer Society Press, pp 164-170.
• Lex Wolters, Robert A. van Engelen, Gerard Cats, Nils Gustaffson, and Tomas Wilhelmsson, A Data-Parallel HIRLAM Forecast Model, in Geerd-R. Hoffmann and Norbert Kreitz (eds.), Coming of Age, proceedings of the Sixth ECMWF Workshop on the Use of Parallel Processors in Meteorology, World Scientific Publ., 1995, pp 49-62.
• Lex Wolters, Gerard Cats, and Nils Gustafsson, Limited Area Numerical Weather Forecasting on a Massively Parallel Computer, in proceedings of the 8th ACM International Conference on Supercomputing, July 1994, Manchester, England, ACM press, pp 289-296.
• N.A.F.M. Poppelier, A.A. Wolters, and P.W.M. Glaudemans, Properties of Exotic Light Nuclei, Z. Phys. A364 (1993) 11-20.
• Lex Wolters and Gerard Cats, A Parallel Implementation of the HIRLAM Model, in Geerd-R. Hoffmann and Tuomo Kauranne (eds.), Parallel Supercomputing in Atmospheric Science, proceedings of the Fifth ECMWF Workshop on the Use of Parallel Processors in Meteorology, World Scientific Publ., 1993, pp 486-499.
• Lex Wolters, Atmosphere and Ocean Circulation Simulation on Masssively Parallel Computers, in P. van Camp (ed.), proceedings of the Seventh International Workshop on the Use of Supercomputers in Theoretical Science, Antwerp, June 1992.
• Lex Wolters, Gerard Cats, and Harry A.G. Wijshoff, Programming Environments for Atmosphere and Ocean Circulation Simulation on Massively Parallel Computers, in proceedings of the DPRI Symposium, Boston, April 1992.
• V. Paar, D. Vorkapic, K. Heyde, A.G.M. van Hees, and A.A. Wolters, Broken isospin symmetry in the shell model and chaotic behavior, Physics Letters B271 (1991) 1-6.
• A.A. Wolters, A.G.M. van Hees, and P.W.M. Glaudemans, The p-shell nuclei in a (0+2)\hbar\omega model space. I Method., Physical Review C42 (1990) 2053-2061.
• A.A. Wolters, A.G.M. van Hees, and P.W.M. Glaudemans, The p-shell nuclei in a (0+2)\hbar\omega model space. II Results., Physical Review C42 (1990) 2062-2078.
• S.W. Kikstra, C. van der Leun, P.M. Endt, J.G.L. Booten, A.G.M. van Hees, and A.A. Wolters, The 40Ca level scheme investigated with the 39K (p,gamma) 40Ca reaction, Nuclear Physics A512 (1990) 425-465.
• P.M. Endt, C. Alderliesten, F. Zijderhand, A.A. Wolters, and A.G.M. van Hees, Spectroscopic information on 24Mg and 28Si from proton capture, Nuclear Physics A510 (1990) 209-243.
• Lex Wolters: The p-shell nuclei in a (0+2)\hbar\omega model space, PhD. Thesis, Utrecht University, 1989.
• M. Takahara, M. Hino, T. Oda, K. Muto, A.A. Wolters, and K. Sato, Microscopic calculation of the rates of electron captures which induce the collapse of stellar O+Ne+Mg cores, Nuclear Physics A504 (1989) 167-192.
• V. Paar, D. Vorkapic, K. Heyde, A.G.M. van Hees, and A.A. Wolters, comment on `Broken symmetries and chaotic behaviour in 26Al', Physical Review Letters 62 (1989) 2643.
• N.A.F.M. Poppelier, J.H. de Vries, A.A. Wolters, and P.W.M. Glaudemans, A shell-model study of light exotic nuclei, in proceedings of the 5th International Conference on Nuclei far from Stability, American Institute of Physics (New York, 1988) 334-343.
• G.J. Kramer, H.P. Blok, J.F.A. van Hienen, S. Brandenburg, M.N. Harakeh, S.Y. van der Werf, P.W.M. Glaudemans, and A.A. Wolters, Spectroscopic factors from the 51V (d,3He) 50Ti reaction, Nuclear Physics A477 (1988) 55-76.
• A.G.M. van Hees, A.A. Wolters, and P.W.M. Glaudemans, Static moments and phenomenological interactions, Nuclear Physics A476 (1988) 61-73.
• A.A. Wolters, A.G.M. van Hees, and P.W.M. Glaudemans, An expansion of the shell-model space for light nuclei, Europhysics Letters 5 (1988) 7-12.
• A.G.M. van Hees, A.A. Wolters, and P.W.M. Glaudemans, An effective interaction derived from spectra and static moments, Physics Letters B196 (1987) 19-23.
• A.G.M. van Hees, A.A. Wolters, N.A.F.M. Poppelier, P.H. Bruinsma, and P.W.M. Glaudemans, Interactions for large-scale shell-model calculations, in proceedings of the International Nuclear Physics Conference (Harrogate, 1986) 153.
• D. Zwarts, N.R. Walet, A.A. Wolters, P.W.M. Glaudemans, and J.M. van Kats, New frontiers in nuclear structure studies, in A.H.L. Emmen (ed.), Supercomputer Applications, (Amsterdam, 1985) 113-115.
• A.A. Wolters, N.R. Walet, D. Zwarts, P.W.M. Glaudemans, and J.M. van Kats, Virtual memory on the Cyber 205: implicit I/O, data and storage management, Supercomputer 5 (1985) 19-28.

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