Refereed Journal Publications

• Julien Langou, Zizhong Chen, George Bosilca and Jack Dongarra. Recovery Patterns for Iterative Methods in a Parallel Unstable Environment. SIAM J. on Scientific Computing, 30(1):102-116, 2007.
• Alfredo Buttari, Jack Dongarra, Julie Langou, Julien Langou, Piotr Luszczek, and Jakub Kurzak. Mixed Precision Iterative Refinement Techniques for the Solution of Dense Linear Systems International Journal of High Performance Computing Applications, 21(4):457-466, 2007.
• Alfredo Buttari, Victor Eijkhout, Julien Langou, and Salvatore Filippone. Performance Optimization and Modeling of Blocked Sparse Kernels. International Journal of High Performance Computing Applications, 21(4):467-484, 2007.
• Marc Baboulin, Serge Gratton, Luc Giraud, and Julien Langou. A distributed packed storage for large parallel calculations Concurrency and Computation: Practice and Experience, 19(4):483-502, 2007.
• Luc Giraud, Serge Gratton, and Julien Langou. Convergence in Backward Error of Relaxed GMRES. SIAM J. on Scientific Computing, 29(2):710-728, 2007.
• Stanimire Tomov, Julien Langou, Jack Dongarra, Andrew Canning, and Lin-Wang Wang. Conjugate-gradient eigenvalue solvers in computing electronic properties of nanostructure architectures. International Journal of Computational Science and Engineering , 2(3/4):205-212, 2006.
• Alicja Smoktunowicz, Jesse Barlow, and Julien Langou. A note on the error analysis of Classical Gram-Schmidt. Numerische Mathematik, 105(2):299-313, December 2006.
• Luc Giraud, Julien Langou, and Guillaume Sylvand. On the parallel solution of large industrial wave propagation problems. Journal of Computational Acoustics, 14(1):83-111, March 2006.
• George Bosilca, Zizhong Chen, Jack Dongarra, Victor Eijkhout, Graham E. Fagg, Erika Fuentes, Julien Langou, Piotr Luszczek, Jelena Pjesivac-Grbovic, Keith Seymour, Haihang You, and Satish S. Vadiyar. Self Adapting Numerical Software (SANS) Effort. IBM Journal of Research and Development, 50(2/3):223-238,2006.
• Luc Giraud, Julien Langou, and Miroslav Rozložník. On the loss of orthogonality in the Gram-Schmidt orthognalization process. Computer and Mathematics with Applications, 50:1069-1075, 2005.
• Luc Giraud, Julien Langou, Miroslav Rozložník, and Jasper van den Eshof. Rounding error analysis of the classical Gram-Schmidt orthogonalization process. Numerische Mathematik, 101(1):87-100, July 2005.
• Valérie Frayssé, Luc Giraud, Serge Gratton, and Julien Langou. Algorithm 842: A set of GMRES routines for Real and Complex Arithmetics on High Performance Computers. ACM Transactions on Mathematical Software (TOMS), 31(2):228-238, June 2005.
• Iain S. Duff, Luc Giraud, Julien Langou, and Émeric Martin. Using spectral low rank preconditioners for large electromagnetic calculations. International Journal for Numerical Methods in Engineering, 62(3):416-434, January 2005.
• Luc Giraud, Serge Gratton, and Julien Langou. A rank-k update procedure for reorthogonalizing the orthogonal factor from modified Gram-Schmidt. SIAM J. Matrix Analysis and Applications, 25(4):1163-1177, August 2004.
• Luc Giraud and Julien Langou. Robust selective Gram-Schmidt reorthogonalization. SIAM J. Scientific Computing, 25(2):417-441, November 2003.
• Luc Giraud and Julien Langou. When modified Gram-Schmidt generates a well-conditioned set of vectors. IMA Journal of Numerical Analysis, 22(4):521-528, October 2002.

Papers accepted for Publication in Refereed Journals

• Marc Baboulin, Luc Giraud, Serge Gratton, and Julien Langou. Parallel tools for solving incremental dense least squares problems. Application to space geodesy. LAPACK Working Note 179. Accepted for publication in Journal of Algorithms and Computational Technology (Volume 2, number 3).
• Alfredo Buttari, Julien Langou, Jakub Kurzak, and Jack Dongarra. Parallel Tiled QR Factorization for Multicore Architectures. LAPACK Working Note 190. Accepted for publication in Concurrency and Computation: Practice and Experience .

Papers submitted and under review

• Marc Baboulin, Jack Dongarra, Serge Gratton, and Julien Langou. Computing the Conditioning of the Components of a Linear Least Squares Solution. LAPACK Working Note 193.
• Alfredo Buttari, Julien Langou, Jakub Kurzak, and Jack Dongarra. A Class of Parallel Tiled Linear Algebra Algorithms for Multicore Architectures. LAPACK Working Note 191.

Papers published in refereed Conference Proceedings

• James Demmel, Jack Dongarra, Beresford Parlett, William Kahan, Ming Gu, David Bindel, Yozo Hida, Xiaoye Li, Osni Marques, E. Jason Riedy, Christof Voemel, Julien Langou, Piotr Luszczek, Jakub Kurzak, Alfredo Buttari, Julie Langou, and Stanimire Tomov (2006). Prospectus for the Next LAPACK and ScaLAPACK Libraries. LAPACK Working Note 181.
• Alfredo Buttari, Jack Dongarra, Jakub Kurzak, Julien Langou, Piotr Luszczek, and Stanimire Tomov. The Impact of Multicore on Math Software. In the Proceedings of workshop on state-of-the-art in scientific and parallel computing (Para06), Umeå, Sweden, June 18-21, 2006. Springer's Lecture Notes in Computer Science, LCNS-xxxx:xx-xx, 200x.
• A. Zunger, A. Franceschetti, G. Bester, W.B. Jones, Kwiseon Kim, P. A. Graf, L-W. Wang, A. Canning, O. Marques, C. Voemel, J. Dongarra, J. Langou and S. Tomov. Predicting the Electronic Properties of 3D, Million-Atom Semiconductor Nanostructure Architectures, J. Phys.: Conf. Ser. 46:292-298.
• Julie Langou, Julien Langou, Piotr Luszczek, Jakub Kurzak, Alfredo Buttari, and Jack Dongarra (2006). Exploiting the performance of 32 bit floating point arithmetic in obtaining 64 bit accuracy (revisiting iterative refinement for linear systems) . Super Computing 2006 (SC06). ICL's webpage about the paper .
• Julien Langou, George Bosilca, Graham Fagg and Jack Dongarra (2005). Hash functions for MPI datatypes. In the Proceedings of the 12th European PVM/MPI Users' Group Meeting, Sorrento, Italy, September 2005. Springer's Lecture Notes in Computer Science, LCNS-3666:76-83, 2005. related software.
• Wesley B. Jones, Gabriel Bester, Andrew Canning, Alberto Franceschetti, Peter A. Graf, Kwiseon Kim, Julien Langou, Lin-Wang Wang, Jack Dongarra, and Alex Zunger. Nanopse: A nanoscience problem solving environment for atomistic electronic structure of semiconductor nanostructures. In Journal of Physics: Conference Series, volume 16, pages 277--282, 2005.
• Zizhong Chen, Graham E. Fagg, Edgar Gabriel, Julien Langou, Thara Angskun, George Bosilca, and Jack Dongarra. Building fault survivable MPI programs with FT-MPI using diskless-checkpointing. in the Proceedings of the tenth ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming (PPoPP), pages 213-223, Chicago, IL, USA, June 2005.
• Stanimire Tomov, Julien Langou, Andrew Canning, Lin-Wang Wang, and Jack Dongarra Comparison of Nonlinear Conjugate-Gradient methods for computing the Electronic Properties of Nanostructure Architectures. In the Proceedings of 5th International Conference on Computational Science (ICCS), Atlanta, GA, USA, May 2005, Part III. Springer's Lecture Notes in Computer Science, LCNS-3516(3):317-325, 2005.
• Guillaume Alléon, Bruno Carpentieri, Iain S. Duff, Luc Giraud, Julien Langou, Émeric Martin, and Guillaume Sylvand. Efficient parallel iterative solvers for the solution of large dense linear systems arising from the boundary element method in electromagnetism. In the Proceedings of the International Conference on Supercomputing in Nuclear Application (SNA), Paris, France, September 2003.

Book Chapters

• Victor Eijkhout, Julien Langou, and Jack Dongarra. Chapter 13: Parallel Linear Algebra Software. In Frontiers of Parallel Processing for Scientific Computing, M. A. Heroux, P. Raghavan, and H. D. Simon Eds. SIAM Software, Environments and Tools. Society for Industrial and Applied Mathematics, Philadelphia, PA, USA, pages 233-247, 2006.
• Jack Dongarra, Victor Eijkhout, and Julien Langou Section 74: BLAS . In Handbook of Linear Algebra, Leslie Hogben Ed., pages 74-1,74-7, CRC Press, 2006.
• Zhaojun Bai, James Demmel, Jack Dongarra, Julien Langou, and Jenny Wang. Section 75: LAPACK . In Handbook of Linear Algebra, Leslie Hogben Ed., pages 75-1,75-24, CRC Press, 2006.
• Jack Dongarra, Victor Eijkhout, and Julien Langou. Section 77: Summary of Software for Linear Algebra Freely Available on the Web . In Handbook of Linear Algebra, Leslie Hogben Ed., pages 77-1,77-3, CRC Press, 2006.

Manuscript

• Julien Langou (2003). Solving Large Linear Systems with Multiple Right-Hand Sides. PhD. Dissertation.