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Julien Langou
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- affiliation: University of Colorado Denver
- not to be confused with: Julie Langou
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Journal Articles
- 2024
- [j31]Thijs Steel, Raf Vandebril, Julien Langou:
A new deflation criterion for the QZ algorithm. Numer. Linear Algebra Appl. 31(1) (2024) - 2022
- [j30]Daniel Bielich, Julien Langou, Stephen J. Thomas, Kasia Swirydowicz, Ichitaro Yamazaki, Erik G. Boman:
Low-synch Gram-Schmidt with delayed reorthogonalization for Krylov solvers. Parallel Comput. 112: 102940 (2022) - 2021
- [j29]Katarzyna Swirydowicz, Julien Langou, Shreyas Ananthan, Ulrike Meier Yang, Stephen J. Thomas:
Low synchronization Gram-Schmidt and generalized minimal residual algorithms. Numer. Linear Algebra Appl. 28(2) (2021) - 2016
- [j28]Massimiliano Fasi, Julien Langou, Yves Robert, Bora Uçar:
A backward/forward recovery approach for the preconditioned conjugate gradient method. J. Comput. Sci. 17: 522-534 (2016) - 2015
- [j27]Mathieu Faverge, Julien Herrmann, Julien Langou, Bradley R. Lowery, Yves Robert, Jack J. Dongarra:
Mixing LU and QR factorization algorithms to design high-performance dense linear algebra solvers. J. Parallel Distributed Comput. 85: 32-46 (2015) - 2013
- [j26]Jack J. Dongarra, Mathieu Faverge, Thomas Hérault, Mathias Jacquelin, Julien Langou, Yves Robert:
Hierarchical QR factorization algorithms for multi-core clusters. Parallel Comput. 39(4-5): 212-232 (2013) - [j25]Fred G. Gustavson, Jerzy Wasniewski, Jack J. Dongarra, José R. Herrero, Julien Langou:
Level-3 Cholesky Factorization Routines Improve Performance of Many Cholesky Algorithms. ACM Trans. Math. Softw. 39(2): 9:1-9:10 (2013) - 2012
- [j24]James Demmel, Laura Grigori, Mark Hoemmen, Julien Langou:
Communication-optimal Parallel and Sequential QR and LU Factorizations. SIAM J. Sci. Comput. 34(1) (2012) - [j23]Henri Calandra, Serge Gratton, Julien Langou, Xavier Pinel, Xavier Vasseur:
Flexible Variants of Block Restarted GMRES Methods with Application to Geophysics. SIAM J. Sci. Comput. 34(2) (2012) - 2011
- [j22]Emmanuel Agullo, Camille Coti, Thomas Hérault, Julien Langou, Sylvain Peyronnet, Ala Rezmerita, Franck Cappello, Jack J. Dongarra:
QCG-OMPI: MPI applications on grids. Future Gener. Comput. Syst. 27(4): 357-369 (2011) - [j21]Eugene Vecharynski, Julien Langou:
Any admissible cycle-convergence behavior is possible for restarted GMRES at its initial cycles. Numer. Linear Algebra Appl. 18(3): 499-511 (2011) - 2010
- [j20]Eugene Vecharynski, Julien Langou:
The Cycle-Convergence of Restarted GMRES for Normal Matrices Is Sublinear. SIAM J. Sci. Comput. 32(1): 186-196 (2010) - [j19]Fred G. Gustavson, Jerzy Wasniewski, Jack J. Dongarra, Julien Langou:
Rectangular full packed format for cholesky's algorithm: factorization, solution, and inversion. ACM Trans. Math. Softw. 37(2): 18:1-18:21 (2010) - 2009
- [j18]Marc Baboulin, Alfredo Buttari, Jack J. Dongarra, Jakub Kurzak, Julie Langou, Julien Langou, Piotr Luszczek, Stanimire Tomov:
Accelerating scientific computations with mixed precision algorithms. Comput. Phys. Commun. 180(12): 2526-2533 (2009) - [j17]Jack J. Dongarra, Julien Langou:
The Problem With the Linpack Benchmark 1.0 Matrix Generator. Int. J. High Perform. Comput. Appl. 23(1): 5-13 (2009) - [j16]George Bosilca, Remi Delmas, Jack J. Dongarra, Julien Langou:
Algorithm-based fault tolerance applied to high performance computing. J. Parallel Distributed Comput. 69(4): 410-416 (2009) - [j15]Marc Baboulin, Jack J. Dongarra, Serge Gratton, Julien Langou:
Computing the conditioning of the components of a linear least-squares solution. Numer. Linear Algebra Appl. 16(7): 517-533 (2009) - [j14]Alfredo Buttari, Julien Langou, Jakub Kurzak, Jack J. Dongarra:
A class of parallel tiled linear algebra algorithms for multicore architectures. Parallel Comput. 35(1): 38-53 (2009) - 2008
- [j13]Alfredo Buttari, Julien Langou, Jakub Kurzak, Jack J. Dongarra:
Parallel tiled QR factorization for multicore architectures. Concurr. Comput. Pract. Exp. 20(13): 1573-1590 (2008) - 2007
- [j12]Marc Baboulin, Luc Giraud, Serge Gratton, Julien Langou:
A distributed packed storage for large dense parallel in-core calculations. Concurr. Comput. Pract. Exp. 19(4): 483-502 (2007) - [j11]Alfredo Buttari, Jack J. Dongarra, Julie Langou, Julien Langou, Piotr Luszczek, Jakub Kurzak:
Mixed Precision Iterative Refinement Techniques for the Solution of Dense Linear Systems. Int. J. High Perform. Comput. Appl. 21(4): 457-466 (2007) - [j10]Alfredo Buttari, Victor Eijkhout, Julien Langou, Salvatore Filippone:
Performance Optimization and Modeling of Blocked Sparse Kernels. Int. J. High Perform. Comput. Appl. 21(4): 467-484 (2007) - [j9]Luc Giraud, Serge Gratton, Julien Langou:
Convergence in Backward Error of Relaxed GMRES. SIAM J. Sci. Comput. 29(2): 710-728 (2007) - [j8]Julien Langou, Zizhong Chen, George Bosilca, Jack J. Dongarra:
Recovery Patterns for Iterative Methods in a Parallel Unstable Environment. SIAM J. Sci. Comput. 30(1): 102-116 (2007) - 2006
- [j7]Jack J. Dongarra, George Bosilca, Zizhong Chen, Victor Eijkhout, Graham E. Fagg, Erika Fuentes, Julien Langou, Piotr Luszczek, Jelena Pjesivac-Grbovic, Keith Seymour, Haihang You, Sathish S. Vadhiyar:
Self-adapting numerical software (SANS) effort. IBM J. Res. Dev. 50(2-3): 223-238 (2006) - [j6]Stanimire Tomov, Julien Langou, Jack J. Dongarra, Andrew Canning, Lin-Wang Wang:
Conjugate-gradient eigenvalue solvers in computing electronic properties of nanostructure architectures. Int. J. Comput. Sci. Eng. 2(3/4): 205-212 (2006) - [j5]Alicja Smoktunowicz, Jesse L. Barlow, Julien Langou:
A note on the error analysis of classical Gram-Schmidt. Numerische Mathematik 105(2): 299-313 (2006) - 2005
- [j4]Luc Giraud, Julien Langou, Miroslav Rozlozník, Jasper van den Eshof:
Rounding error analysis of the classical Gram-Schmidt orthogonalization process. Numerische Mathematik 101(1): 87-100 (2005) - [j3]Valérie Frayssé, Luc Giraud, Serge Gratton, Julien Langou:
Algorithm 842: A set of GMRES routines for real and complex arithmetics on high performance computers. ACM Trans. Math. Softw. 31(2): 228-238 (2005) - 2004
- [j2]Luc Giraud, Serge Gratton, Julien Langou:
A Rank-k Update Procedure for Reorthogonalizing the Orthogonal Factor from Modified Gram-Schmidt. SIAM J. Matrix Anal. Appl. 25(4): 1163-1177 (2004) - 2003
- [j1]Luc Giraud, Julien Langou:
A Robust Criterion for the Modified Gram-Schmidt Algorithm with Selective Reorthogonalization. SIAM J. Sci. Comput. 25(2): 417-441 (2003)
Conference and Workshop Papers
- 2024
- [c29]Lionel Eyraud-Dubois, Guillaume Iooss, Julien Langou, Fabrice Rastello:
Tightening I/O Lower Bounds through the Hourglass Dependency Pattern. SPAA 2024: 183-193 - 2022
- [c28]James Demmel, Jack J. Dongarra, Mark Gates, Greg Henry, Julien Langou, Xiaoye S. Li, Piotr Luszczek, Weslley S. Pereira, E. Jason Riedy, Cindy Rubio-González:
Proposed Consistent Exception Handling for the BLAS and LAPACK. Correctness@SC 2022: 1-9 - [c27]Olivier Beaumont, Philippe Duchon, Lionel Eyraud-Dubois, Julien Langou, Mathieu Vérité:
Symmetric Block-Cyclic Distribution: Fewer Communications Leads to Faster Dense Cholesky Factorization. SC 2022: 29:1-29:15 - [c26]Olivier Beaumont, Lionel Eyraud-Dubois, Julien Langou, Mathieu Vérité:
I/O-Optimal Algorithms for Symmetric Linear Algebra Kernels. SPAA 2022: 423-433 - 2020
- [c25]Olivier Beaumont, Julien Langou, Willy Quach, Alena Shilova:
A Makespan Lower Bound for the Tiled Cholesky Factorization Based on ALAP Schedule. Euro-Par 2020: 134-150 - [c24]Valentin Le Fèvre, Thomas Hérault, Julien Langou, Yves Robert:
A Comparison of Several Fault-Tolerance Methods for the Detection and Correction of Floating-Point Errors in Matrix-Matrix Multiplication. Euro-Par Workshops 2020: 303-315 - [c23]Auguste Olivry, Julien Langou, Louis-Noël Pouchet, P. Sadayappan, Fabrice Rastello:
Automated derivation of parametric data movement lower bounds for affine programs. PLDI 2020: 808-822 - 2017
- [c22]Jianwei Xiao, Ming Gu, Julien Langou:
Fast Parallel Randomized QR with Column Pivoting Algorithms for Reliable Low-Rank Matrix Approximations. HiPC 2017: 233-242 - [c21]Mathieu Faverge, Julien Langou, Yves Robert, Jack J. Dongarra:
Bidiagonalization and R-Bidiagonalization: Parallel Tiled Algorithms, Critical Paths and Distributed-Memory Implementation. IPDPS 2017: 668-677 - 2014
- [c20]Mathieu Faverge, Julien Herrmann, Julien Langou, Bradley R. Lowery, Yves Robert, Jack J. Dongarra:
Designing LU-QR Hybrid Solvers for Performance and Stability. IPDPS 2014: 1029-1038 - 2013
- [c19]Julien Langou, Matthias Bolten, Laura Grigori, Marián Vajtersic:
Topic 10: Parallel Numerical Algorithms - (Introduction). Euro-Par 2013: 482-483 - 2012
- [c18]Jack J. Dongarra, Mathieu Faverge, Thomas Hérault, Julien Langou, Yves Robert:
Hierarchical QR Factorization Algorithms for Multi-core Cluster Systems. IPDPS 2012: 607-618 - [c17]Emmanuel Agullo, George Bosilca, Bérenger Bramas, Cedric Castagnede, Olivier Coulaud, Eric Darve, Jack J. Dongarra, Mathieu Faverge, Nathalie Furmento, Luc Giraud, Xavier Lacoste, Julien Langou, Hatem Ltaief, Matthias Messner, Raymond Namyst, Pierre Ramet, Toru Takahashi, Samuel Thibault, Stanimire Tomov, Ichitaro Yamazaki:
Abstract: Matrices Over Runtime Systems at Exascale. SC Companion 2012: 1330-1331 - [c16]Emmanuel Agullo, George Bosilca, Bérenger Bramas, Cedric Castagnede, Olivier Coulaud, Eric Darve, Jack J. Dongarra, Mathieu Faverge, Nathalie Furmento, Luc Giraud, Xavier Lacoste, Julien Langou, Hatem Ltaief, Matthias Messner, Raymond Namyst, Pierre Ramet, Toru Takahashi, Samuel Thibault, Stanimire Tomov, Ichitaro Yamazaki:
Poster: Matrices over Runtime Systems at Exascale. SC Companion 2012: 1332 - 2011
- [c15]Emmanuel Agullo, Cédric Augonnet, Jack J. Dongarra, Mathieu Faverge, Julien Langou, Hatem Ltaief, Stanimire Tomov:
LU factorization for accelerator-based systems. AICCSA 2011: 217-224 - [c14]George Bosilca, Aurélien Bouteiller, Anthony Danalis, Mathieu Faverge, Azzam Haidar, Thomas Hérault, Jakub Kurzak, Julien Langou, Pierre Lemarinier, Hatem Ltaief, Piotr Luszczek, Asim YarKhan, Jack J. Dongarra:
Flexible Development of Dense Linear Algebra Algorithms on Massively Parallel Architectures with DPLASMA. IPDPS Workshops 2011: 1432-1441 - [c13]Henricus Bouwmeester, Mathias Jacquelin, Julien Langou, Yves Robert:
Tiled QR factorization algorithms. SC 2011: 7:1-7:11 - 2010
- [c12]Emmanuel Agullo, Camille Coti, Jack J. Dongarra, Thomas Hérault, Julien Langou:
QR factorization of tall and skinny matrices in a grid computing environment. IPDPS 2010: 1-11 - [c11]Emmanuel Agullo, Henricus Bouwmeester, Jack J. Dongarra, Jakub Kurzak, Julien Langou, Lee Rosenberg:
Towards an Efficient Tile Matrix Inversion of Symmetric Positive Definite Matrices on Multicore Architectures. VECPAR 2010: 129-138 - 2007
- [c10]Alfredo Buttari, Julien Langou, Jakub Kurzak, Jack J. Dongarra:
Parallel Tiled QR Factorization for Multicore Architectures. PPAM 2007: 639-648 - [c9]Julien Langou, George Bosilca:
Advanced MPI Programming. PVM/MPI 2007: 15-16 - 2006
- [c8]Alfredo Buttari, Jack J. Dongarra, Jakub Kurzak, Julie Langou, Julien Langou, Piotr Luszczek, Stanimire Tomov:
Exploiting Mixed Precision Floating Point Hardware in Scientific Computations. High Performance Computing Workshop 2006: 19-36 - [c7]Alfredo Buttari, Jack J. Dongarra, Jakub Kurzak, Julien Langou, Piotr Luszczek, Stanimire Tomov:
The Impact of Multicore on Math Software. PARA 2006: 1-10 - [c6]James Demmel, Jack J. Dongarra, Beresford N. Parlett, William Kahan, Ming Gu, David Bindel, Yozo Hida, Xiaoye S. Li, Osni Marques, E. Jason Riedy, Christof Vömel, Julien Langou, Piotr Luszczek, Jakub Kurzak, Alfredo Buttari, Julie Langou, Stanimire Tomov:
Prospectus for the Next LAPACK and ScaLAPACK Libraries. PARA 2006: 11-23 - [c5]Daniel Kressner, Julien Langou:
Recent Advances in Dense Linear Algebra: Minisymposium Abstract. PARA 2006: 116 - [c4]Julie Langou, Julien Langou, Piotr Luszczek, Jakub Kurzak, Alfredo Buttari, Jack J. Dongarra:
Tools and techniques for performance - Exploiting the performance of 32 bit floating point arithmetic in obtaining 64 bit accuracy (revisiting iterative refinement for linear systems). SC 2006: 113 - 2005
- [c3]Stanimire Tomov, Julien Langou, Andrew Canning, Lin-Wang Wang, Jack J. Dongarra:
Comparison of Nonlinear Conjugate-Gradient Methods for Computing the Electronic Properties of Nanostructure Architectures. International Conference on Computational Science (3) 2005: 317-325 - [c2]Zizhong Chen, Graham E. Fagg, Edgar Gabriel, Julien Langou, Thara Angskun, George Bosilca, Jack J. Dongarra:
Fault tolerant high performance computing by a coding approach. PPoPP 2005: 213-223 - [c1]Julien Langou, George Bosilca, Graham E. Fagg, Jack J. Dongarra:
Hash Functions for Datatype Signatures in MPI. PVM/MPI 2005: 76-83
Parts in Books or Collections
- 2006
- [p1]Victor Eijkhout, Julien Langou, Jack J. Dongarra:
Parallel Linear Algebra Software. Parallel Processing for Scientific Computing 2006: 233-247
Reference Works
- 2007
- [r1]Yozo Hida, James Demmel, Julien Langou, Jakub Kurzak, Ming Gu, Alfredo Buttari, Stanimire Tomov, Piotr Luszczek, Julie Langou, Osni Marques, Christof Vömel, Xiaoye S. Li, E. Jason Riedy, Jack J. Dongarra, William Kahan, Beresford N. Parlett, David Bindel:
Prospectus for a Dense Linear Algebra Software Library. Handbook of Parallel Computing 2007
Informal and Other Publications
- 2024
- [i24]Lionel Eyraud-Dubois, Guillaume Iooss, Julien Langou, Fabrice Rastello:
Tightening I/O Lower Bounds through the Hourglass Dependency Pattern. CoRR abs/2404.16443 (2024) - [i23]Ali Lotfi, Julien Langou, Mohammad Meysami:
Probabilistic Analysis of Least Squares, Orthogonal Projection, and QR Factorization Algorithms Subject to Gaussian Noise. CoRR abs/2409.18905 (2024) - 2022
- [i22]Olivier Beaumont, Lionel Eyraud-Dubois, Mathieu Vérité, Julien Langou:
I/O-Optimal Algorithms for Symmetric Linear Algebra Kernels. CoRR abs/2202.10217 (2022) - [i21]James Demmel, Jack J. Dongarra, Mark Gates, Greg Henry, Julien Langou, Xiaoye S. Li, Piotr Luszczek, Weslley da Silva Pereira, E. Jason Riedy, Cindy Rubio-González:
Proposed Consistent Exception Handling for the BLAS and LAPACK. CoRR abs/2207.09281 (2022) - [i20]Thijs Steel, Raf Vandebril, Julien Langou:
A new deflation criterion for the QZ algorithm. CoRR abs/2208.02057 (2022) - [i19]Weslley da Silva Pereira, Ali Lotfi, Julien Langou:
Numerical analysis of Givens rotation. CoRR abs/2211.04010 (2022) - 2021
- [i18]Daniel Bielich, Julien Langou, Stephen J. Thomas, Kasia Swirydowicz, Ichitaro Yamazaki, Erik G. Boman:
Low-Synch Gram-Schmidt with Delayed Reorthogonalization for Krylov Solvers. CoRR abs/2104.01253 (2021) - 2019
- [i17]Auguste Olivry, Julien Langou, Louis-Noël Pouchet, P. Sadayappan, Fabrice Rastello:
Automated Derivation of Parametric Data Movement Lower Bounds for Affine Programs. CoRR abs/1911.06664 (2019) - 2018
- [i16]Kasia Swirydowicz, Julien Langou, Shreyas Ananthan, Ulrike Meier Yang, Stephen J. Thomas:
Low synchronization GMRES algorithms. CoRR abs/1809.05805 (2018) - 2016
- [i15]Mathieu Faverge, Julien Langou, Yves Robert, Jack J. Dongarra:
Bidiagonalization with Parallel Tiled Algorithms. CoRR abs/1611.06892 (2016) - 2015
- [i14]Willy Quach, Julien Langou:
A Makespan Lower Bound for the Scheduling of the Tiled Cholesky Factorization based on ALAP scheduling. CoRR abs/1510.05107 (2015) - [i13]Massimiliano Fasi, Julien Langou, Yves Robert, Bora Uçar:
A Backward/Forward Recovery Approach for the Preconditioned Conjugate Gradient Method. CoRR abs/1511.04478 (2015) - 2014
- [i12]Mathieu Faverge, Julien Herrmann, Julien Langou, Bradley R. Lowery, Yves Robert, Jack J. Dongarra:
Designing LU-QR hybrid solvers for performance and stability. CoRR abs/1401.5522 (2014) - 2013
- [i11]Bradley R. Lowery, Julien Langou:
A Greedy Algorithm for Optimally Pipelining a Reduction. CoRR abs/1310.4645 (2013) - 2011
- [i10]Henricus Bouwmeester, Mathias Jacquelin, Julien Langou, Yves Robert:
Tiled QR factorization algorithms. CoRR abs/1104.4475 (2011) - [i9]Jack J. Dongarra, Mathieu Faverge, Thomas Hérault, Julien Langou, Yves Robert:
Hierarchical QR factorization algorithms for multi-core cluster systems. CoRR abs/1110.1553 (2011) - 2010
- [i8]Emmanuel Agullo, Henricus Bouwmeester, Jack J. Dongarra, Jakub Kurzak, Julien Langou, Lee Rosenberg:
Towards an Efficient Tile Matrix Inversion of Symmetric Positive Definite Matrices on Multicore Architectures. CoRR abs/1002.4057 (2010) - [i7]Henricus Bouwmeester, Julien Langou:
A Critical Path Approach to Analyzing Parallelism of Algorithmic Variants. Application to Cholesky Inversion. CoRR abs/1010.2000 (2010) - 2009
- [i6]Fred G. Gustavson, Jerzy Wasniewski, Jack J. Dongarra, Julien Langou:
Rectangular Full Packed Format for Cholesky's Algorithm: Factorization, Solution and Inversion. CoRR abs/0901.1696 (2009) - [i5]Emmanuel Agullo, Camille Coti, Jack J. Dongarra, Thomas Hérault, Julien Langou:
QR Factorization of Tall and Skinny Matrices in a Grid Computing Environment. CoRR abs/0912.2572 (2009) - 2008
- [i4]James Demmel, Laura Grigori, Mark Hoemmen, Julien Langou:
Communication-avoiding parallel and sequential QR factorizations. CoRR abs/0806.2159 (2008) - [i3]George Bosilca, Remi Delmas, Jack J. Dongarra, Julien Langou:
Algorithmic Based Fault Tolerance Applied to High Performance Computing. CoRR abs/0806.3121 (2008) - [i2]Marc Baboulin, Alfredo Buttari, Jack J. Dongarra, Jakub Kurzak, Julie Langou, Julien Langou, Piotr Luszczek, Stanimire Tomov:
Accelerating Scientific Computations with Mixed Precision Algorithms. CoRR abs/0808.2794 (2008) - 2007
- [i1]Alfredo Buttari, Julien Langou, Jakub Kurzak, Jack J. Dongarra:
A Class of Parallel Tiled Linear Algebra Algorithms for Multicore Architectures. CoRR abs/0709.1272 (2007)
Coauthor Index
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