Alfredo Buttari

67%
Libre accès
75
Documents
Affiliations actuelles
  • Algorithmes Parallèles et Optimisation (IRIT-APO)
  • Centre National de la Recherche Scientifique (CNRS)
  • Institut National Polytechnique (Toulouse) (Toulouse INP)
Contact

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Publications

Image document

Truncated QR factorization with pivoting in mixed precision

Alfredo Buttari , Theo Mary , André Pacteau
SIAM Journal on Scientific Computing, 2025, 47 (2), pp.B382-B401. ⟨10.1137/24M1644705⟩
Article dans une revue hal-04490215 v2
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Five-Precision GMRES-based iterative refinement

Patrick Amestoy , Alfredo Buttari , Nicholas Higham , Jean-Yves L’excellent , Theo Mary et al.
SIAM Journal on Matrix Analysis and Applications, 2024, 45 (1), pp.529--552. ⟨10.1137/23M1549079⟩
Article dans une revue hal-03190686 v2
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Communication Avoiding Block Low-Rank Parallel Multifrontal Triangular Solve with Many Right-Hand Sides

Patrick Amestoy , Olivier Boiteau , Alfredo Buttari , Matthieu Gerest , Fabienne Jézéquel et al.
SIAM Journal on Matrix Analysis and Applications, 2024, 45 (1), pp.148-166. ⟨10.1137/23M1568600⟩
Article dans une revue hal-04082415 v1
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Combining sparse approximate factorizations with mixed precision iterative refinement

Patrick Amestoy , Alfredo Buttari , Nicholas J Higham , Jean-Yves L’excellent , Theo Mary et al.
ACM Transactions on Mathematical Software, 2023, 49 (1), pp.1-29. ⟨10.1145/3582493⟩
Article dans une revue hal-03536031 v2
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Is 3D frequency-domain FWI of full-azimuth/long-offset OBN data feasible? The Gorgon case study

Stéphane Operto , Patrick Amestoy , Stephen Beller , Alfredo Buttari , L. Combe et al.
Leading Edge, 2023, 42 (3), pp.173-183. ⟨10.1190/tle42030173.1⟩
Article dans une revue hal-03922986 v1
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Task-based parallel programming for scalable matrix product algorithms

Emmanuel Agullo , Alfredo Buttari , Abdou Guermouche , Julien Herrmann , Antoine Jego
ACM Transactions on Mathematical Software, 2023, ⟨10.1145/3583560⟩
Article dans une revue hal-03936659 v2
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Mixed Precision Low Rank Approximations and their Application to Block Low Rank LU Factorization

Patrick Amestoy , Olivier Boiteau , Alfredo Buttari , Matthieu Gerest , Fabienne Jézéquel et al.
IMA Journal of Numerical Analysis, 2022, ⟨10.1093/imanum/drac037⟩
Article dans une revue hal-03251738 v3
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Block Low-rank Single Precision Coarse Grid Solvers for Extreme Scale Multigrid Methods

Alfredo Buttari , Markus Huber , Philippe Leleux , Théo Mary , Ulrich Ruede et al.
Numerical Linear Algebra with Applications, 2021, 29 (1), ⟨10.1002/nla.2407⟩
Article dans une revue hal-02528532 v1
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Block Low-Rank Matrices with Shared Bases: Potential and Limitations of the BLR2S Format

Cleve Ashcraft , Alfredo Buttari , Théo Mary
SIAM Journal on Matrix Analysis and Applications, 2021, 42 (2), ⟨10.1137/20M1386451⟩
Article dans une revue hal-03070416 v2
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Parallel QR factorization of block-tridiagonal matrices

Alfredo Buttari , Søren Hauberg , Costy Kodsi
SIAM Journal on Scientific Computing, 2020, 42 (6), pp.C313-C334. ⟨10.1137/19M1306166⟩
Article dans une revue hal-02370953 v2
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Bridging the gap between flat and hierarchical low-rank matrix formats: the multilevel BLR format

Patrick Amestoy , Alfredo Buttari , Jean-Yves L'Excellent , Theo Mary
SIAM Journal on Scientific Computing, 2019, 41 (3), pp.A1414-A1442. ⟨10.1137/18M1182760⟩
Article dans une revue hal-01774642 v3
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A Tridiagonalization Method for Symmetric Saddle-Point Systems

Alfredo Buttari , Dominique Orban , Daniel Ruiz , David Titley-Peloquin
SIAM Journal on Scientific Computing, 2019, 41 (5), pp.S409-S432. ⟨10.1137/18M1194900⟩
Article dans une revue hal-02343661 v1
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Performance and Scalability of the Block Low-Rank Multifrontal Factorization on Multicore Architectures

Patrick Amestoy , Alfredo Buttari , Jean-Yves L'Excellent , Theo Mary
ACM Transactions on Mathematical Software, 2019, 45 (1), pp.1-23. ⟨10.1145/3242094⟩
Article dans une revue hal-01955766 v2
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Large-scale 3D EM modeling with a Block Low-Rank multifrontal direct solver

Daniil Shantsev , Piyoosh Jaysaval , Sébastien de La Kethulle de Ryhove , Patrick Amestoy , Alfredo Buttari et al.
Geophysical Journal International, 2017, 209 (3), pp.1558-1571. ⟨10.1093/gji/ggx106⟩
Article dans une revue hal-01672952 v1
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On the Complexity of the Block Low-Rank Multifrontal Factorization

Patrick Amestoy , Alfredo Buttari , Jean-Yves L'Excellent , Theo Mary
SIAM Journal on Scientific Computing, 2017, 39 (4), pp.34. ⟨10.1137/16M1077192⟩
Article dans une revue hal-01322230 v3
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Implementing multifrontal sparse solvers for multicore architectures with Sequential Task Flow runtime systems

Emmanuel Agullo , Alfredo Buttari , Abdou Guermouche , Florent Lopez
ACM Transactions on Mathematical Software, 2016, ⟨10.1145/2898348⟩
Article dans une revue hal-01333645 v1
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Robust memory-aware mappings for parallel multifrontal factorizations

Emmanuel Agullo , Patrick Amestoy , Alfredo Buttari , Abdou Guermouche , Jean-Yves L'Excellent et al.
SIAM Journal on Scientific Computing, 2016, 38 (3), pp.C256 - C279. ⟨10.1137/130938505⟩
Article dans une revue hal-01334113 v2

Fast 3D frequency-domain full waveform inversion with a parallel Block Low-Rank multifrontal direct solver: application to OBC data from the North Sea

Patrick Amestoy , Romain Brossier , Alfredo Buttari , Jean-Yves L'Excellent , Théo Mary et al.
Geophysics, 2016, 81 (6), pp.R363-R383. ⟨10.1190/geo2016-0052.1⟩
Article dans une revue hal-01349119 v1

Performance Optimization and Modeling of Blocked Sparse Kernels

Alfredo Buttari , Victor Eijkhout , Julien Langou , Salvatore Filippone
International Journal of High Performance Computing Applications, 2016, 21 (4), pp.467-484. ⟨10.1177/1094342007083801⟩
Article dans une revue istex hal-02421133 v1

Mixed Precision Iterative Refinement Techniques for the Solution of Dense Linear Systems

Alfredo Buttari , Jack J. Dongarra , Julie Langou , Julien Langou , Piotr Luszczek et al.
International Journal of High Performance Computing Applications, 2016, 21 (4), pp.457-466. ⟨10.1177/1094342007084026⟩
Article dans une revue hal-02421121 v1

Improving Multifrontal Methods by Means of Block Low-Rank Representations

Patrick Amestoy , Cleve Ashcraft , Olivier Boiteau , Alfredo Buttari , Jean-Yves L'Excellent et al.
SIAM Journal on Scientific Computing, 2015, 37 (3), pp.A1451-A1474. ⟨10.1137/120903476⟩
Article dans une revue hal-01237169 v1
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Shared memory parallelism and low-rank approximation techniques applied to direct solvers in FEM simulation

Patrick Amestoy , Alfredo Buttari , Guillaume Joslin , Jean-Yves L'Excellent , Mohamed Sid-Lakhdar et al.
IEEE Transactions on Magnetics, 2014, vol. 50 (n° 2), pp. 1-4. ⟨10.1109/TMAG.2013.2284024⟩
Article dans une revue hal-01123557 v1
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INTEGRAL/SPI data segmentation to retrieve sources intensity variations

Laurent Bouchet , Patrick Amestoy , Alfredo Buttari , François-Henry Rouet , Maxime Chauvin
Astronomy & Astrophysics - A&A, 2013, vol. 555 (n° A55), pp. 1-22. ⟨10.1051/0004-6361/201219605⟩
Article dans une revue hal-01124774 v1
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Fine-Grained Multithreading for the Multifrontal QR Factorization of Sparse Matrices

Alfredo Buttari
SIAM Journal on Scientific Computing, 2013, vol. 35 (n° 4), pp. 323-345. ⟨10.1137/110846427⟩
Article dans une revue hal-01122471 v1
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Simultaneous analysis of large INTEGRAL/SPI datasets: optimizing the computation of the solution and its variance using sparse matrix algorithms

Laurent Bouchet , Patrick Amestoy , Alfredo Buttari , François-Henry Rouet , Maxime Chauvin
Astronomy and Computing, 2013, vol. 1, pp. 59-69. ⟨10.1016/j.ascom.2013.03.002⟩
Article dans une revue hal-01125193 v1
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Object-Oriented Techniques for Sparse Matrix Computations in Fortran 2003

Salvatore Filippone , Alfredo Buttari
ACM Transactions on Mathematical Software, 2012, 38 (4), pp.1-20. ⟨10.1145/2331130.2331131⟩
Article dans une revue hal-02419121 v1

A class of parallel tiled linear algebra algorithms for multicore architectures

Alfredo Buttari , Julien Langou , Jakub Kurzak , Jack J. Dongarra
Parallel Computing, 2009, 35 (1), pp.38-53. ⟨10.1016/j.parco.2008.10.002⟩
Article dans une revue hal-02420965 v1

Accelerating scientific computations with mixed precision algorithms

Marc Baboulin , Alfredo Buttari , Jack J. Dongarra , Jakub Kurzak , Julie Langou et al.
Computer Physics Communications, 2009, 180 (12), pp.2526-2533. ⟨10.1016/j.cpc.2008.11.005⟩
Article dans une revue hal-02420940 v1

Solving Systems of Linear Equations on the CELL Processor Using Cholesky Factorization

Jakub Kurzak , Alfredo Buttari , Jack Dongarra
IEEE Transactions on Parallel and Distributed Systems, 2008, 19 (9), pp.1175-1186. ⟨10.1109/TPDS.2007.70813⟩
Article dans une revue hal-02421046 v1

Parallel tiled QR factorization for multicore architectures

Alfredo Buttari , Julien Langou , Jakub Kurzak , Jack Dongarra
Concurrency and Computation: Practice and Experience, 2008, 20 (13), ⟨10.1002/cpe.v20:13⟩
Article dans une revue hal-02421078 v1

Using Mixed Precision for Sparse Matrix Computations to Enhance the Performance while Achieving 64-bit Accuracy

Alfredo Buttari , Jack J. Dongarra , Jakub Kurzak , Piotr Luszczek , Stanimir Tomov
ACM Transactions on Mathematical Software, 2008, 34 (4), pp.1-22. ⟨10.1145/1377596.1377597⟩
Article dans une revue hal-02421028 v1

The PlayStation 3 for High-Performance Scientific Computing

Jakub Kurzak , Alfredo Buttari , Piotr Luszczek , Jack J. Dongarra
Computing in Science and Engineering, 2008, 10 (3), pp.84-87. ⟨10.1109/MCSE.2008.85⟩
Article dans une revue hal-02421063 v1

2LEV-D2P4: a package of high-performance preconditioners for scientific and engineering applications

Alfredo Buttari , Pasqua D’ambra , Daniela Di Serafino , Salvatore Filippone
Applicable Algebra in Engineering, Communication and Computing, 2007, 18 (3), pp.223-239. ⟨10.1007/s00200-007-0035-z⟩
Article dans une revue istex hal-02421066 v1

Recent advances on sparse direct solver using Block Low-Rank and mixed precision for large scale applications

Patrick Amestoy , Olivier Boiteau , Alfredo Buttari , Laure Combe , Florian Faucher et al.
SIAM Conference on Applied Linear Algebra (LA24), SIAM: Society for Industrial and Applied Mathematics; Sorbonne Universté, May 2024, Paris, France
Communication dans un congrès hal-04642783 v1

Reducing communications and memory costs of parallel Block Low-Rank solvers

Patrick Amestoy , Olivier Boiteau , Alfredo Buttari , Matthieu Gerest , Fabienne Jézéquel et al.
SIAM Conference on Computational Science and Engineering (CSE 2023), Feb 2023, Amsterdam, Netherlands
Communication dans un congrès hal-03922334 v1
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On the Arithmetic Intensity of Distributed-Memory Dense Matrix Multiplication Involving a Symmetric Input Matrix (SYMM)

Emmanuel Agullo , Alfredo Buttari , Olivier Coulaud , Lionel Eyraud-Dubois , Mathieu Faverge et al.
IPDPS 2023 - 37th International Parallel and Distributed Processing Symposium, IEEE, May 2023, St. Petersburg, FL, United States. pp.357-367
Communication dans un congrès hal-04093162 v1

Vers un solveur direct à base de tâches pour des systèmes linéaires FEM/BEM creux/denses

Emmanuel Agullo , Alfredo Buttari , Marek Felšöci , Guillaume Sylvand
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
Communication dans un congrès hal-04178064 v1

Mixed precision sparse direct solver applied to 3D wave propagation

Patrick Amestoy , Alfredo Buttari , Florian Faucher , Jean-Yves L'Excellent , Matthieu Gerest et al.
8th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2022), Jun 2022, Oslo, Norway
Communication dans un congrès hal-03887660 v1

Solving linear systems efficiently using block low-rank compression in mixed precision

Patrick Amestoy , Olivier Boiteau , Alfredo Buttari , Matthieu Gerest , Fabienne Jézéquel et al.
45ème Congrès National d'Analyse Numérique (CANUM 2022), Jun 2022, Évian-les-Bains, France
Communication dans un congrès hal-03922287 v1

Solving linear systems efficiently using mixed-precision Block Low-Rank compression

Patrick Amestoy , Olivier Boiteau , Alfredo Buttari , Matthieu Gerest , Fabienne Jézéquel et al.
Rencontres Arithmétique de l'informatique Mathématique (RAIM 2021), GdR GdR IM : Informatique Mathématique, May 2021, Paris, France
Communication dans un congrès hal-03783037 v1

Simulation of a Sparse Direct Solver on Heterogeneous Systems using Starpu and Simgrid

Emmanuel Agullo , Alfredo Buttari , Abdou Guermouche , Arnaud Legrand , Ian Masliah et al.
SIAM Conference on Computational Science and Engineering (CSE 2019), Feb 2019, Spokane, United States
Communication dans un congrès hal-02073725 v1

A Tridiagonalization Method for Symmetric and Quasi-Definite Saddle-Point Systems (CM 2018, Colorado, USA)

Alfredo Buttari , Dominique Orban , Daniel Ruiz , David Titley-Peloquin
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
Communication dans un congrès hal-03023422 v1
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Pre-exascale Architectures: OpenPOWER Performance and Usability Assessment for French Scientific Community

Gabriel Hautreux , Alfredo Buttari , Arnaud Beck , Victor Cameo , Dimitri Lecas et al.
ISC High Performance 2017: High Performance Computing, 2017, Frankfurt, Germany. pp.309-324, ⟨10.1007/978-3-319-67630-2_23⟩
Communication dans un congrès hal-02129651 v1
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Exploiting a Parametrized Task Graph model for the parallelization of a sparse direct multifrontal solver

Emmanuel Agullo , George Bosilca , Alfredo Buttari , Abdou Guermouche , Florent Lopez
Euro-Par 2016: Parallel Processing Workshops, Aug 2016, Grenoble, France. ⟨10.1007/978-3-319-58943-5_14⟩
Communication dans un congrès hal-01337748 v1

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

Patrick Amestoy , Romain Brossier , Alfredo Buttari , Jean-Yves L'Excellent , Théo Mary et al.
SEG Annual meeting, Oct 2015, New Orleans, United States. pp.1303-1308, ⟨10.1190/segam2015-5713962.1⟩
Communication dans un congrès hal-01239896 v1

3D frequency-domain seismic modeling with a Parallel BLR multifrontal direct solver

Patrick Amestoy , Romain Brossier , Alfredo Buttari , Jean-Yves L'Excellent , Théo Mary et al.
SEG Annual meeting, Oct 2015, New Orleans, United States. pp.3606-3611
Communication dans un congrès hal-01237869 v1

Task-based multifrontal QR solver for GPU-accelerated multicore architectures

Emmanuel Agullo , Alfredo Buttari , Abdou Guermouche , Florent Lopez
22rd IEEE International Conference on High Performance Computing (HiPC 2015), Dec 2015, Bangalore, India. ⟨10.1109/HiPC.2015.27⟩
Communication dans un congrès hal-01270145 v1
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Fast and Accurate Simulation of Multithreaded Sparse Linear Algebra Solvers

Luka Stanisic , Emmanuel Agullo , Alfredo Buttari , Abdou Guermouche , Arnaud Legrand et al.
The 21st IEEE International Conference on Parallel and Distributed Systems, Dec 2015, Melbourne, Australia
Communication dans un congrès hal-01180272 v2

Shared memory parallelism and low-rank approximation techniques applied to direct solvers in FEM simulation (regular paper)

Patrick Amestoy , Olivier Boiteau , Alfredo Buttari , Guillaume Joslin , Jean-Yves L'Excellent et al.
19th IEEE International Conference on the Computation of Electromagnetic Fields (COMPUMAG 2013), International Compumag Society (ICS) Technical Co-Sponsorship - IEEE Magnetics Society, Jun 2013, Budapest, Hungary
Communication dans un congrès hal-00924660 v1
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Recent advances in sparse direct solvers

Emmanuel Agullo , Patrick Amestoy , Alfredo Buttari , Abdou Guermouche , Guillaume Joslin et al.
22nd International Conference on Structural Mechanics in Reactor Technology (SMiRT 2013), Aug 2013, San Francisco, United States. pp.1-10
Communication dans un congrès hal-01060301 v1
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Multifrontal QR Factorization for Multicore Architectures over Runtime Systems

Emmanuel Agullo , Alfredo Buttari , Abdou Guermouche , Florent Lopez
19th International Conference on Parallel Processing (EuroPar 2013), Aug 2013, Aachen, Germany. pp.521-532, ⟨10.1007/978-3-642-40047-6_53⟩
Communication dans un congrès hal-01220611 v1

3D frequency-domain seismic modeling with a Block Low-Rank algebraic multifrontal direct solver

Clément Weisbecker , Patrick Amestoy , Olivier Boiteau , Romain Brossier , Alfredo Buttari et al.
Society of Exploration Geophysicists annual meeting (SEG 2013), Society of Exploration Geophysicists, 2013, Houston, Texas, United States. ⟨10.1190/segam2013-0603.1⟩
Communication dans un congrès hal-00924638 v1

Improving Multifrontal methods by means of Low-Rank Approximations techniques

Patrick Amestoy , Cleve Ashcraft , Olivier Boiteau , Alfredo Buttari , Jean-Yves L'Excellent et al.
SIAM Conference on Applied Linear Algebra 2012, Jun 2012, Valencia, Spain. pp.A1451-A1474
Communication dans un congrès hal-00789684 v1

Exploiting Multithreaded Tree Parallelism for Multicore Systems in a Parallel Multifrontal Solver

Patrick Amestoy , Alfredo Buttari , Abdou Guermouche , Jean-Yves L'Excellent , Mohamed W. Sid-Lakhdar
SIAM Conference on Parallel Processing for Scientific Computing (SIAM PP12 2012), Feb 2012, Savannah, GA, United States
Communication dans un congrès hal-00789698 v1

Robust Memory-Aware Mappings for Parallel Multifrontal Factorizations

Emmanuel Agullo , Patrick Amestoy , Alfredo Buttari , Abdou Guermouche , Jean-Yves L'Excellent et al.
SIAM Conference on Parallel Processing for Scientific Computing (SIAM PP 2012), SIAM Activity Group on Supercomputing, Feb 2012, Savannah, Georgia, United States
Communication dans un congrès hal-00726644 v1
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Grouping variables in Frontal Matrices to improve Low-Rank Approximations in a Multifrontal Solver

Clément Weisbecker , Patrick Amestoy , Cleve Ashcraft , Olivier Boiteau , Alfredo Buttari et al.
International Conference On Preconditioning Techniques For Scientific And Industrial Applications (PRECONDITIONING 2011), INRIA Bordeaux Sud-Ouest; ENSEIRB; University of Bordeaux 1, May 2011, Bordeaux, France
Communication dans un congrès inria-00581561 v1
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A Novel Aggregation Method based on Graph Matching for Algebraic MultiGrid Preconditioning of Sparse Linear Systems

Pasqua d'Ambra , Alfredo Buttari , Daniela Di Serafino , Salvatore Filippone , Simone Gentile et al.
International Conference On Preconditioning Techniques For Scientific And Industrial Applications (PRECONDITIONING 2011), INRIA Bordeaux Sud-Ouest; ENSEIRB; University of Bordeaux 1, May 2011, Bordeaux, France
Communication dans un congrès inria-00580434 v1

Towards a parallel analysis phase for a multifrontal sparse solver

Patrick Amestoy , Alfredo Buttari , Jean-Yves L'Excellent
5th International Workshop on Parallel Matrix Algorithms and Applications (PMAA 2008), Jun 2008, Neuchâtel, Switzerland
Communication dans un congrès hal-00803488 v1

The minimum degree ordering with dynamical constraints

Patrick Amestoy , Alfredo Buttari , Abdou Guermouche , Jean-Yves L'Excellent , Bora Uçar
Markus Beckers; Johannes Lotz; Viktor Mosenkis; Uwe Naumann. Abstracts of the 5th SIAM Workshop on Combinatorial Scientific Computing, SIAM, pp.36-38, 2011, Technical Report
Chapitre d'ouvrage hal-00945083 v1

The Multifrontal Method

Patrick Amestoy , Alfredo Buttari , Iain S. Duff , Abdou Guermouche , Jean-Yves L'Excellent et al.
David Padua. Encyclopedia of Parallel Computing, Springer, pp.1209-1216, 2011, 978-0-387-09765-7. ⟨10.1007/978-0-387-09766-4_86⟩
Chapitre d'ouvrage hal-00787015 v1

MUMPS

Patrick Amestoy , Alfredo Buttari , Iain S. Duff , Abdou Guermouche , Jean-Yves L'Excellent et al.
David Padua. Encyclopedia of Parallel Computing, Springer, pp.1232-1238, 2011, 978-0-387-09766-4. ⟨10.1007/978-0-387-09766-4_204⟩
Chapitre d'ouvrage hal-00787042 v1
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Scalability of parallel sparse direct solvers: methods, memory and performance

Alfredo Buttari
Distributed, Parallel, and Cluster Computing [cs.DC]. Toulouse INP, 2018
HDR tel-01913033 v1