Publications de Alfredo BUTTARI
Patrick Amestoy, Alfredo Buttari, Nicholas Higham, Jean-Yves L’excellent, Théo Mary, Bastien Vieublé
Five-Precision GMRES-based iterative refinement
SIAM Journal on Matrix Analysis and Applications, 2024, 45 (1), pp.529–552. ⟨10.1137/23M1549079⟩
Patrick Amestoy, Olivier Boiteau, Alfredo Buttari, Matthieu Gerest, Fabienne Jézéquel, Jean-Yves L’excellent, Théo Mary
Communication Avoiding Block Low-Rank Parallel Multifrontal Triangular Solve with Many Right-Hand Sides
SIAM Journal on Matrix Analysis and Applications, 2024, 45 (1), pp.148-166. ⟨10.1137/23M1568600⟩
Patrick Amestoy, Alfredo Buttari, Nicholas J Higham, Jean-Yves L’excellent, Théo Mary, Bastien Vieublé
Combining sparse approximate factorizations with mixed precision iterative refinement
ACM Transactions on Mathematical Software, 2023, 49 (1), pp.1-29. ⟨10.1145/3582493⟩
Stéphane Operto, Patrick Amestoy, Stephen Beller, Alfredo Buttari, L. Combe, Victorita Dolean, Matthieu Gerest, Gaoshan Guo, Pierre Jolivet, Jean-Yves L’Excellent, Frichnel Mamfoumbi, Théo Mary, Chiara Puglisi, Alessandra Ribodetti, Pierre-Henri Tournier
Is 3D frequency-domain FWI of full-azimuth/long-offset OBN data feasible? The Gorgon case study
Leading Edge, 2023, 42 (3), pp.173-183. ⟨10.1190/tle42030173.1⟩
Emmanuel Agullo, Alfredo Buttari, Abdou Guermouche, Julien Herrmann, Antoine Jego
Task-based parallel programming for scalable matrix product algorithms
ACM Transactions on Mathematical Software, 2023, ⟨10.1145/3583560⟩
Patrick Amestoy, Olivier Boiteau, Alfredo Buttari, Matthieu Gerest, Fabienne Jézéquel, Jean-Yves L’Excellent, Théo Mary
Mixed Precision Low Rank Approximations and their Application to Block Low Rank LU Factorization
IMA Journal of Numerical Analysis, 2022, ⟨10.1093/imanum/drac037⟩
Alfredo Buttari, Markus Huber, Philippe Leleux, Théo Mary, Ulrich Ruede, Barbara Wohlmuth
Block Low-rank Single Precision Coarse Grid Solvers for Extreme Scale Multigrid Methods
Numerical Linear Algebra with Applications, 2021, 29 (1), ⟨10.1002/nla.2407⟩
Cleve Ashcraft, Alfredo Buttari, Théo Mary
Block Low-Rank Matrices with Shared Bases: Potential and Limitations of the BLR2S Format
SIAM Journal on Matrix Analysis and Applications, 2021, 42 (2), ⟨10.1137/20M1386451⟩
Alfredo Buttari, Søren Hauberg, Costy Kodsi
Parallel QR factorization of block-tridiagonal matrices
SIAM Journal on Scientific Computing, 2020, 42 (6), pp.C313-C334. ⟨10.1137/19M1306166⟩
Alfredo Buttari, Dominique Orban, Daniel Ruiz, David Titley-Peloquin
A Tridiagonalization Method for Symmetric Saddle-Point Systems
SIAM Journal on Scientific Computing, 2019, 41 (5), pp.S409-S432. ⟨10.1137/18M1194900⟩
Patrick Amestoy, Alfredo Buttari, Jean-Yves L’Excellent, Théo Mary
Bridging the gap between flat and hierarchical low-rank matrix formats: the multilevel BLR format
SIAM Journal on Scientific Computing, 2019, 41 (3), pp.A1414-A1442. ⟨10.1137/18M1182760⟩
Patrick Amestoy, Alfredo Buttari, Jean-Yves L’Excellent, Théo Mary
Performance and Scalability of the Block Low-Rank Multifrontal Factorization on Multicore Architectures
ACM Transactions on Mathematical Software, 2019, 45 (1), pp.1-23. ⟨10.1145/3242094⟩
Patrick Amestoy, Alfredo Buttari, Jean-Yves L’Excellent, Théo Mary
On the Complexity of the Block Low-Rank Multifrontal Factorization
SIAM Journal on Scientific Computing, 2017, 39 (4), pp.34. ⟨10.1137/16M1077192⟩
Daniil Shantsev, Piyoosh Jaysaval, Sébastien de La Kethulle de Ryhove, Patrick Amestoy, Alfredo Buttari, Jean-Yves L’Excellent, Théo Mary
Large-scale 3D EM modeling with a Block Low-Rank multifrontal direct solver
Geophysical Journal International, 2017, 209 (3), pp.1558-1571. ⟨10.1093/gji/ggx106⟩
Patrick Amestoy, Romain Brossier, Alfredo Buttari, Jean-Yves L’Excellent, Théo Mary, Ludovic Métivier, Alain Miniussi, Stéphane Operto
Fast 3D frequency-domain full waveform inversion with a parallel Block Low-Rank multifrontal direct solver: application to OBC data from the North Sea
Geophysics, 2016, 81 (6), pp.R363-R383. ⟨10.1190/geo2016-0052.1⟩
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
International Journal of High Performance Computing Applications, 2016, 21 (4), pp.457-466. ⟨10.1177/1094342007084026⟩
Alfredo Buttari, Victor Eijkhout, Julien Langou, Salvatore Filippone
Performance Optimization and Modeling of Blocked Sparse Kernels
International Journal of High Performance Computing Applications, 2016, 21 (4), pp.467-484. ⟨10.1177/1094342007083801⟩
Emmanuel Agullo, Alfredo Buttari, Abdou Guermouche, Florent Lopez
Implementing multifrontal sparse solvers for multicore architectures with Sequential Task Flow runtime systems
ACM Transactions on Mathematical Software, 2016, ⟨10.1145/2898348⟩
Emmanuel Agullo, Patrick Amestoy, Alfredo Buttari, Abdou Guermouche, Jean-Yves L’Excellent, François-Henry Rouet
Robust memory-aware mappings for parallel multifrontal factorizations
SIAM Journal on Scientific Computing, 2016, 38 (3), pp.C256 – C279. ⟨10.1137/130938505⟩
Patrick Amestoy, Cleve Ashcraft, Olivier Boiteau, Alfredo Buttari, Jean-Yves L’Excellent, Clément Weisbecker
Improving Multifrontal Methods by Means of Block Low-Rank Representations
SIAM Journal on Scientific Computing, 2015, 37 (3), pp.A1451-A1474. ⟨10.1137/120903476⟩
Patrick Amestoy, Alfredo Buttari, Guillaume Joslin, Jean-Yves L’Excellent, Mohamed Sid-Lakhdar, Clément Weisbecker, Michele Forzan, Cristian Pozza, Rémy Perrin, Valène Pellissier
Shared memory parallelism and low-rank approximation techniques applied to direct solvers in FEM simulation
IEEE Transactions on Magnetics, 2014, vol. 50 (n° 2), pp. 1-4. ⟨10.1109/TMAG.2013.2284024⟩
Fine-Grained Multithreading for the Multifrontal QR Factorization of Sparse Matrices
Dans : SIAM Journal on Scientific Computing, Society for Industrial and Applied Mathematics (SIAM), USA, Vol. 35 N. 4, p. 323-345, 2013.
Accès : http://epubs.siam.org/doi/abs/10.1137/110846427 – https://oatao.univ-toulouse.fr/12707/
BibTeXLaurent Bouchet, Patrick Amestoy, Alfredo Buttari, François-Henry Rouet, Maxime Chauvin
INTEGRAL/SPI data segmentation to retrieve sources intensity variations
Dans : Astronomy & Astrophysics (A&A), EDP Sciences, Vol. A52, (en ligne), juillet 2013.
Accès : http://dx.doi.org/10.1051/0004-6361/201219605 – https://oatao.univ-toulouse.fr/12455/
BibTeXLaurent Bouchet, Patrick Amestoy, Alfredo Buttari, François-Henry Rouet, Maxime Chauvin
Simultaneous analysis of large INTEGRAL/SPI datasets: optimizing the computation of the solution and its variance using sparse matrix algorithms
Dans : Astronomy and Computing, Elsevier, Vol. 1, p. 59-69, 2013.
Accès : http://www.sciencedirect.com/science/article/pii/S2213133713000061?via=ihub – https://oatao.univ-toulouse.fr/12446/
BibTeXSalvatore Filippone, Alfredo Buttari
Object-Oriented Techniques for Sparse Matrix Computations in Fortran 2003
Dans : ACM Transactions on Mathematical Software (TOMS), ACM : Association for Computing Machinery, New York, États-Unis, Vol. 38 N. 4, p. 1-23, août 2012.
Alfredo Buttari, Julien Langou, Jakub Kurzak, Jack Dongarra
A class of parallel tiled linear algebra algorithms for multicore architectures
Dans : Parallel Computing, World Scientific, Vol. 35 N. 1, p. 38-53, 2009.
Résumé Accès : http://dx.doi.org/10.1016/j.parco.2008.10.002
BibTeXMarc Baboulin, Alfredo Buttari, Jack Dongarra, Jakub Kurzak, Julie Langou
Accelerating scientific computations with mixed precision algorithm
Dans : Computer Physics Communications (CPC), Elsevier, Vol. 180 N. 12, p. 2526-2533, décembre 2009.
Résumé Accès : http://dx.doi.org/10.1016/j.cpc.2008.11.005
BibTeX
Patrick Amestoy, Olivier Boiteau, Alfredo Buttari, Laure Combe, Florian Faucher, Matthieu Gerest, Fabienne Jézéquel, Jean-Yves L’Excellent, Théo Mary, S. Operto, Chiara Puglisi
Recent advances on sparse direct solver using Block Low-Rank and mixed precision for large scale applications
SIAM Conference on Applied Linear Algebra (LA24), SIAM: Society for Industrial and Applied Mathematics; Sorbonne Universté, May 2024, Paris, France
Emmanuel Agullo, Alfredo Buttari, Marek Felšöci, Guillaume Sylvand
Vers un solveur direct à base de tâches pour des systèmes linéaires FEM/BEM creux/denses
ComPAS 2023 – Conférence francophone d’informatique en Parallélisme, Architecture et Système, LISTIC : Laboratoire d’Informatique, Systèmes, Traitement de l’Information et de la Connaissance, de l’Université Savoie Mont Blanc., Jul 2023, Annecy, France
Emmanuel Agullo, Alfredo Buttari, Olivier Coulaud, Lionel Eyraud-Dubois, Mathieu Faverge, Alain Franc, Abdou Guermouche, Antoine Jego, Romain Peressoni, Florent Pruvost
On the Arithmetic Intensity of Distributed-Memory Dense Matrix Multiplication Involving a Symmetric Input Matrix (SYMM)
IPDPS 2023 – 37th International Parallel and Distributed Processing Symposium, IEEE, May 2023, St. Petersburg, FL, United States. pp.357-367
Patrick Amestoy, Olivier Boiteau, Alfredo Buttari, Matthieu Gerest, Fabienne Jézéquel, Jean-Yves L’Excellent, Théo Mary
Reducing communications and memory costs of parallel Block Low-Rank solvers
SIAM Conference on Computational Science and Engineering (CSE 2023), Feb 2023, Amsterdam, Netherlands
Patrick Amestoy, Olivier Boiteau, Alfredo Buttari, Matthieu Gerest, Fabienne Jézéquel, Jean-Yves L’Excellent, Théo Mary
Solving linear systems efficiently using block low-rank compression in mixed precision
45ème Congrès National d’Analyse Numérique (CANUM 2022), Jun 2022, Évian-les-Bains, France
Patrick Amestoy, Alfredo Buttari, Florian Faucher, Jean-Yves L’Excellent, Matthieu Gerest, Théo Mary
Mixed precision sparse direct solver applied to 3D wave propagation
8th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2022), Jun 2022, Oslo, Norway
Patrick Amestoy, Olivier Boiteau, Alfredo Buttari, Matthieu Gerest, Fabienne Jézéquel, Jean-Yves L’Excellent, Théo Mary
Solving linear systems efficiently using mixed-precision Block Low-Rank compression
Rencontres Arithmétique de l’informatique Mathématique (RAIM 2021), GdR GdR IM : Informatique Mathématique, May 2021, Paris, France
Emmanuel Agullo, Alfredo Buttari, Abdou Guermouche, Arnaud Legrand, Ian Masliah, Luka Stanisic
Simulation of a Sparse Direct Solver on Heterogeneous Systems using Starpu and Simgrid
SIAM Conference on Computational Science and Engineering (CSE 2019), Feb 2019, Spokane, United States
Alfredo Buttari, Dominique Orban, Daniel Ruiz, David Titley-Peloquin
A Tridiagonalization Method for Symmetric and Quasi-Definite Saddle-Point Systems (CM 2018, Colorado, USA)
15th Copper Mountain Conference On Iterative Methods (CM 2018), Front Range Scientific Computations, Inc, Boulder, Colorado; University of Colorado, Sandia National Labs; Emory University; Society for Industrial and Applied Mathematics: SIAM Activity Group on Linear Algebra, Mar 2018, Copper Mountain, Colorado, United States
Gabriel Hautreux, Alfredo Buttari, Arnaud Beck, Victor Cameo, Dimitri Lecas, Laurence Voutquenne-Nazabadioko, Emeric Brun, Eric Boyer, Fausto Malvagi, Gabriel Staffelbach, Isabelle D’ast, Joeffrey Legaux, Ghislain Lartigue, Gilles G. Grasseau, Guillaume Latu, Juan Escobar, Julien Bigot, Julien Derouillat, Matthieu Haefele, Nicolas Renon, Philippe Parnaudeau, Philippe Wautelet, Pierre-François Lavallée, Pierre Kestener, Rémi Lacroix, Stephane Requena, Anthony Scemama, Vincent Moureau, Matthieu Etancelin, Yann Meurdesoif
Pre-exascale Architectures: OpenPOWER Performance and Usability Assessment for French Scientific Community
ISC High Performance 2017: High Performance Computing, 2017, Frankfurt, Germany. pp.309-324, ⟨10.1007/978-3-319-67630-2_23⟩
Emmanuel Agullo, George Bosilca, Alfredo Buttari, Abdou Guermouche, Florent Lopez
Exploiting a Parametrized Task Graph model for the parallelization of a sparse direct multifrontal solver
Euro-Par 2016: Parallel Processing Workshops, Aug 2016, Grenoble, France. ⟨10.1007/978-3-319-58943-5_14⟩
Emmanuel Agullo, Alfredo Buttari, Abdou Guermouche, Florent Lopez
Task-based multifrontal QR solver for GPU-accelerated multicore architectures
22rd IEEE International Conference on High Performance Computing (HiPC 2015), Dec 2015, Bangalore, India. ⟨10.1109/HiPC.2015.27⟩
Luka Stanisic, Emmanuel Agullo, Alfredo Buttari, Abdou Guermouche, Arnaud Legrand, Florent Lopez, Brice Videau
Fast and Accurate Simulation of Multithreaded Sparse Linear Algebra Solvers
The 21st IEEE International Conference on Parallel and Distributed Systems, Dec 2015, Melbourne, Australia
Patrick Amestoy, Romain Brossier, Alfredo Buttari, Jean-Yves L’Excellent, Théo Mary, Ludovic Métivier, Alain Miniussi, Stéphane Operto, Alessandra Ribodetti, Jean Virieux, Clement Weisbecker
Efficient 3D frequency-domain full-waveform inversion of ocean-bottom cable data with sparse block low-rank direct solver: a real data case study from the North Sea
SEG Annual meeting, Oct 2015, New Orleans, United States. pp.1303-1308, ⟨10.1190/segam2015-5713962.1⟩
Patrick Amestoy, Romain Brossier, Alfredo Buttari, Jean-Yves L’Excellent, Théo Mary, Ludovic Métivier, Alain Miniussi, Stéphane Operto, Jean Virieux, Clement Weisbecker
3D frequency-domain seismic modeling with a Parallel BLR multifrontal direct solver
SEG Annual meeting, Oct 2015, New Orleans, United States. pp.3606-3611
Clément Weisbecker, Patrick Amestoy, Olivier Boiteau, Romain Brossier, Alfredo Buttari, Jean-Yves L’Excellent, Stéphane Operto, Jean Virieux
3D frequency-domain seismic modeling with a Block Low-Rank algebraic multifrontal direct solver (regular paper)
Dans : Society of Exploration Geophysicists annual meeting (SEG 2013), Houston – USA, 22/09/13-27/09/13, Society of Exploration Geophysicists, (en ligne), janvier 2013.
Accès : https://www.onepetro.org/conference-paper/SEG-2013-0603 – https://oatao.univ-toulouse.fr/15168/
BibTeXEmmanuel Agullo, Patrick Amestoy, Alfredo Buttari, Abdou Guermouche, Guillaume Joslin, Jean-Yves L’Excellent, Xiaoye Sherry Li, Artem Napov, François-Henry Rouet, Mohamed Sid-Lakhdar, Shen Wang, Clément Weisbecker, Ichitaro Yamazaki
Recent Advances in Sparse Direct Solvers (regular paper)
Dans : Conference on Structural Mechanics in Reactor Technology (SMIRT 2013), San Francisco, 18/08/13-23/08/13, Elsevier, (en ligne), septembre 2013.
Accès : http://crd.lbl.gov/assets/pubs_presos/paper3.pdf – https://oatao.univ-toulouse.fr/15162/
BibTeXEmmanuel Agullo, Alfredo Buttari, Abdou Guermouche, Florent Lopez
Multifrontal QR Factorization for Multicore Architectures over Runtime Systems (regular paper)
Dans : EuroPar2013, Aachen, 27/08/13-30/08/13, Vol. 8097, Felix Wolf, Bernd Mohr, Dieter Mey (Eds.), Springer, Lecture Notes in Computer Science, p. 521-532, août 2013.
Accès : http://dx.doi.org/10.1007/978-3-642-40047-6_53 – https://oatao.univ-toulouse.fr/12708/
BibTeXEmmanuel Agullo, Patrick Amestoy, Alfredo Buttari, Abdou Guermouche, Jean-Yves L’Excellent, François-Henry Rouet
Robust memory-aware mappings for parallel multifrontal factorizations
Dans : SIAM conference on Parallel Processing for Scientific Computing (PP12), Savannah, GA, USA, 15/02/12-17/02/12.
Patrick Amestoy, Alfredo Buttari, Abdou Guermouche, Jean-Yves L’Excellent, Mohamed Sid-Lakhdar
Exploiting Multithreaded Tree Parallelism for Multicore Systems in a Parallel Multifrontal Solver
Dans : SIAM conference on Parallel Processing for Scientific Computing (PP12), Savannah, GA, USA, 15/02/12-17/02/12.
Laurent Bouchet, Patrick Amestoy, Alfredo Buttari, François-Henry Rouet, Maxime Chauvin
INTEGRAL/SPI data segmentation to retrieve sources intensity variations (regular paper)
Dans : An INTEGRAL view of the high-energy sky (the first 10 years), Paris, France, 15/10/12-19/10/12, A. Goldwurm, F. Lebrun, C. Winkler (Eds.), Proceedings of Science, (en ligne), 2012.
Accès : http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=176
BibTeXPatrick Amestoy, Cleve Ashcraft, Olivier Boiteau, Alfredo Buttari, Jean-Yves L’Excellent, Clément Weisbecker
Improving Multifrontal methods by means of Low-Rank Approximations techniques
Dans : 2012 SIAM Conference on Applied Linear Algebra, Valencia, Spain, 18/06/12-22/06/12.
Résumé Accès : http://amestoy.perso.enseeiht.fr/doc/weisbecker_la12.pdf
BibTeXPatrick Amestoy, Cleve Ashcraft, Olivier Boiteau, Alfredo Buttari, Jean-Yves L’Excellent, Clément Weisbecker
Grouping variables in Frontal Matrices to improve Low-Rank Approximations in a Multifrontal Solver
Dans : International Conference On Preconditioning Techniques For Scientific And Industrial Applications, Preconditioning 2011, Bordeaux, 16/05/11-18/05/11.
Résumé Accès : http://amestoy.perso.enseeiht.fr/doc/weisbecker_precond11.pdf
BibTeXPatrick Amestoy, Alfredo Buttari, Philippe Combes, Abdou Guermouche, Jean-Yves L’Excellent, Tzvetomila Slavova, Bora Uçar
Overview of MUMPS (A multifrontal Massively Parallel Solver)
Dans : 2nd French-Japonese workshop on Petascale Applications, Algorithms and Programming (PAAP’08), Toulouse, 23/06/08-24/06/08.
Patrick Amestoy, Alfredo Buttari, Jean-Yves L’Excellent
Towards a parallel analysis phase for a multifrontal sparse solver
Dans : 5th International workshop on Parallel Matrix Algorithms and Applications (PMAA’08), Neuchâtel, Switzerland, 20/06/08-22/06/08.
Patrick Amestoy, Alfredo Buttari, Iain Duff, Abdou Guermouche, Jean-Yves L’Excellent, Bora Uçar
MUMPS (MUltifrontal Massively Parallel Solver)
Dans : Encyclopedia of Parallel Computing. David Padua (Eds.) , Springer, p. 0-0, août 2011.
Accès : http://www.springer.com/computer/swe/book/978-0-387-09765-7
BibTeXPatrick Amestoy, Alfredo Buttari, Iain Duff, Abdou Guermouche, Jean-Yves L’Excellent, Bora Uçar
The multifrontal method
Dans : Encyclopedia of Parallel Computing. David Padua (Eds.) , Springer, p. 0-0, août 2011.
Accès : http://www.springer.com/computer/swe/book/978-0-387-09765-7
BibTeX
Scalability of parallel sparse direct solvers: methods, memory and performance
Distributed, Parallel, and Cluster Computing [cs.DC]. Toulouse INP, 2018
Matthieu Gerest, Patrick Amestoy, Olivier Boiteau, Alfredo Buttari, Fabienne Jézéquel, Jean-Yves L’Excellent, Théo Mary
Block low-rank compression in mixed precision for the solution of sparse linear systems
Sparse Days conference 2022, Jun 2022, Saint-Girons, France.
Théo Beuzeville, Alfredo Buttari, Serge Gratton, Theo Mary
Deterministic and probabilistic backward error analysis of neural networks in floating-point arithmetic
2024
Alfredo Buttari, Nicholas J Higham, Théo Mary, Bastien Vieublé
A modular framework for the backward error analysis of GMRES
2024
Alfredo Buttari, Théo Mary, André Pacteau
Truncated QR factorization with pivoting in mixed precision
2024
Théo Beuzeville, Alfredo Buttari, Serge Gratton, Theo Mary, Erkan Ulker
Adversarial attacks via Sequential Quadratic Programming
2022
Théo Beuzeville, Pierre Boudier, Alfredo Buttari, Serge Gratton, Théo Mary, Stéphane Pralet
Adversarial attacks via backward error analysis
2021