Pierre Ramet
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  • News
    • Participation au projet européen EuroHPC DARE
    • Soutenance de thèse : Clément Richefort
    • Initiative HybQuant : Maison du quantique en Nouvelle-Aquitaine
    • Build PaStiX with Guix-HPC
  • Publications
    • Scalable and Portable LU Factorization with Partial Pivoting on top of Runtime Systems
    • Toward an algebraic multigrid method for the indefinite Helmholtz equation
    • Comparative Study of Mixed-Precision and Low-Rank Compression Techniques in Sparse Direct Solvers
    • Toward an algebraic multigrid method for the indefinite Helmholtz equation
    • Enhancing sparse direct solver scalability through runtime system automatic data partition
    • New parallel features in the sparse solver PaStiX
    • Toward a multilevel method for the Helmholtz equation
    • Toward a Multigrid Method for the Indefinite Helmholtz Equation
    • Improving the memory and time overhead of low-rank parallel linear sparse direct solvers
    • Reaching the Quality of SVD for Low-Rank Compression Through QR Variants
    • Deciding Non-Compressible Blocks in Sparse Direct Solvers using Incomplete Factorization
    • Study of the recent developments around the PaStiX solver for the EoCoE project: distributed mem- ory, runtime systems, and low-rank
    • The JOREK non-linear extended MHD code and applications to large-scale instabilities and their control in magnetically confined fusion plasmas
    • Deciding Non-Compressible Blocks in Sparse Direct Solvers using Incomplete Factorization
    • Improving mapping for sparse direct solvers: A trade-off between data locality and load balancing
    • Improving mapping for sparse direct solvers: A trade-off between data locality and load balancing
    • Recent Developments Around the Block Low-Rank PaStiX Solver
    • Sparse supernodal solver using block low-rank compression: Design, performance and analysis
    • A hierarchical fast direct solver for distributed memory machines with manycore nodes
    • Rank Revealing QR Methods for Sparse Block Low Rank Solvers
    • Rank Revealing QR Methods for Sparse Block Low Rank Solvers
    • Efficient Parallel Solution of the 3D Stationary Boltzmann Transport Equation for Diffusive Problems
    • Utilisation de techniques de compression low-rank pour un solveur parallèle direct creux
    • Block Low-rank Algebraic Clustering for Sparse Direct Solvers
    • Exploiting Parameterized Task-graph in Sparse Direct Solvers
    • Supernodes ordering to enhance Block Low-Rank compression in sparse direct solvers
    • On the use of low-rank arithmetic to reduce the complexity of parallel sparse linear solvers based on direct factorization techniques
    • Utilisation de la compression low-rank pour réduire la complexité du solveur PaStiX
    • Sparse supernodal solver using block low-rank compression: Design, performance and analysis
    • Utilisation de la compression Block Low-Rank pour accélérer un solveur direct creux supernodal
    • Supernodes ordering to enhance Block Low-Rank compression in sparse direct solvers
    • Heterogeneous architectures, Hybrid methods, Hierarchical matrices for Sparse Linear Solvers
    • Sparse Supernodal Solver Using Block Low-Rank Compression: design, performance and analysis
    • Heterogeneous architectures, Hybrid methods, Hierarchical matrices for Sparse Linear Solvers
    • Sparse supernodal solver with low-rank compression for solving the frequency-domain Maxwell equations discretized by a high order HDG method
    • Efficient Parallel Solution of the 3D Stationary Boltzmann Transport Equation for Diffusive Problems
    • Sparse Supernodal Solver exploiting Low-Rankness Property
    • Sparse Supernodal Solver Using Block Low-Rank Compression
    • Utilisation de la compression Block Low-Rank pour accélérer un solveur direct creux supernodal
    • Exploiting Modern Manycore Architecture in Sparse Direct Solver with Runtime Systems
    • Impact of Blocking Strategies for Sparse Direct Solvers on Top of Generic Runtimes
    • Sparse Supernodal Solver Using Hierarchical Compression over Runtime System
    • Reordering Strategy for Blocking Optimization in Sparse Linear Solvers
    • Sparse Supernodal Solver Using Block Low-Rank Compression
    • Sparse Supernodal Solver Using Hierarchical Compression
    • Exploiting Kepler architecture in sparse direct solver with runtime systems
    • On the use of low rank approximations for sparse direct solvers
    • Overview of Task-based Sparse and Data-sparse Solvers on Top of Runtime Systems
    • Exploiting H-Matrices in Sparse Direct Solvers
    • Impact of Blocking Strategies for Sparse Direct Solvers on Top of Generic Runtimes
    • Reordering strategy for blocking optimization in sparse linear solvers
    • Optimizations of hybrid sparse linear solvers relying on Schur complement and domain decomposition approaches
    • Blocking strategy optimizations for sparse direct linear solver on heterogeneous architectures
    • On the design of parallel linear solvers for large scale problems
    • Towards a recursive graph bipartitioning algorithm for well balanced domain decomposition
    • PaStiX: Parallel Sparse Matrix Package
    • Blocking strategy optimization for sparse direct linear solvers on heterogeneous architectures
    • Blocking strategy optimizations for sparse direct linear solver on heterogeneous architectures
    • On the use of H-Matrix Arithmetic in PaStiX: a Preliminary Study
    • 3D Cartesian Transport Sweep for Massively Parallel Architectures with PARSEC
    • Divide and Conquer Symmetric Tridiagonal Eigensolver for Multicore Architectures
    • Simul'Elec and PASTIX interface specifications
    • Solveurs Directs
    • A task-based sparse direct solver suited for large scale hierarchical/heterogeneous architectures
    • Benchmarking of the linear solver PaStiX for integration in LESCAPE
    • Biodiversiton : application du HPC à l'étude de la biodiversit
    • Towards a recursive graph bipartitioning algorithm for well balanced domain decomposition
    • Scheduling and memory optimizations for sparse direct solver on multi-core/multi-gpu duster systems
    • Etude de la factorisation directe hétŕogène et de la factorisation incomplt̀e sur solveur PaStiX appliqu'ś `d̀es syst`es̀ issus de probl`em ̀du CEA/CESTA
    • On the design of parallel linear solvers for large scale problems
    • An improved recursive graph bipartitioning algorithm for well balanced domain decomposition
    • Adaptive mesh refinement for numerical simulation of MHD instabilities in tokamaks: JOREK code
    • Distributed sparse matrix factorization on top of tasks based runtime systems
    • Toward parallel scalable linear solvers suited for large scale hierarchical parallel platforms
    • An improved recursive graph bipartitioning algorithm for well balanced domain decomposition
    • Parallel 3D Sweep Kernel with PARSEC
    • Task-based linear solvers for modern architectures
    • 3D Cartesian Transport Sweep for Massively Parallel Architectures on top of PaRSEC
    • Fast Algorithms for Dense Linear Algebra
    • Fast Algorithms for Dense Linear Algebra
    • Fast direct linear solvers for the boundary element method
    • From hybrid architectures to hybrid solvers
    • Nested Dissection with Balanced Halo
    • Toward parallel scalable linear solvers suited for large scale hierarchical parallel platforms
    • 3D Cartesian Transport Sweep for Massively Parallel Architectures on top of PaRSEC
    • Taking advantage of hybrid systems for sparse direct solvers via task-based runtimes
    • Solveurs Directs
    • Hybrid methods, Hybrid architectures, Hybrid compressions for sparse direct solvers
    • Taking advantage of hybrid systems for sparse direct solvers via task-based runtimes
    • Hybrid methods, Hybrid architectures, Hybrid compressions for sparse direct solvers
    • Parallel Numerical Solvers on top of Runtime Systems
    • Sparse Linear Algebra over DAG Runtimes
    • Shared Memory Parallelism for 3D Cartesian Discrete Ordinates Solver
    • From hybrid architectures to hybrid solvers
    • From hybrid architectures to hybrid solvers
    • Méthodes directes et hybrides pour des solveurs creux adapatś aux machines multiCPUs/multiGPUs
    • Towards Domain Decomposition with Balanced Halo
    • Work stealing and granularity optimizations for a sparse solver on manycores
    • Augmentation and Deflation in Krylov subspace methods
    • Solveurs Directs
    • Deflation and augmentation techniques in Krylov lienar solvers
    • Sparse Linear Algebra over DAG Runtimes
    • Developments in Parallel, Distributed, Grid and Cloud Computing for Engineering
    • Matrices over Runtime Systems at Exascale
    • Scheduling for Sparse Solver on Manycore Architectures
    • Sparse direct solver on top of large-scale multicore systems with GPU accelerators
    • Sparse direct solvers with accelerators over DAG runtimes
    • Memory Optimization to Build a Schur Complement
    • Sparse direct solver on top of large-scale multicore systems with GPU accelerators
    • Toward a supernodal sparse direct solver over DAG runtimes
    • Fine Grain Scheduling for Sparse Solver on Manycore Architectures
    • Memory Optimization to Build a Schur Complement in an Hybrid Solver
    • Résolution des systèmes lináires sur calculateurs p'áflopiques
    • Sparse direct solvers with accelerators over DAG runtimes
    • Conception d'un solveur haute performance de systèmes linéaires creux couplant des mt́hodes multigrilles et directes pour la r'ólution des 'eátions de Maxwell 3D en r'egé harmonique discr'eti'́ees ŕ 'el'eńtsínis
    • PaStiX: sparse direct/hybrid solver on many CPU/GPU clusters
    • Solveurs Directs
    • Linear algebra and sparse direct methods
    • Efficient parallel resolution of the simplified transport equations in mixed-dual formulation
    • Ordonnancement dynamique dans le solveur PaStiX pour des machines NUMA et multicoeurs
    • Scalable direct and iterative solvers
    • Development of an International Matrix-Solver Prediction System on a French-Japanese International Grid Computing Environment
    • Formation Parallélisme
    • Scalable direct and iterative solvers
    • Domain decomposition method for the Simplified Transport Equation in neutronic
    • A NUMA Aware Scheduler for a Parallel Sparse Direct Solver
    • Design of a parallel hybrid direct/iterative sparse linear solver
    • Static-Dynamic Hybrid Scheduling in sparse linear algebra for large clusters of NUMA and multi-cores architectures
    • Dynamic Scheduling for Sparse Direct Solver on NUMA and Multicore Architectures
    • Vers un solveur de systèmes linéaires creux adapt ́aux machines NUMA
    • Dynamic Scheduling for Sparse Direct Solver on NUMA and Multicore Architectures
    • Non-Linear MHD simulations of Edge Localised Modes
    • A Non Overlapping Parallel Domain Decomposition Method Applied to The Simplified Transport Equations
    • A NUMA Aware Scheduler for a Parallel Sparse Direct Solver
    • Non-linear MHD simulations of edge localized modes (ELMs)
    • Numerical simulation of unsteady MHD flows and applications
    • Résolution de Systèmes Lináires, Algorithmes et Parall'ísme
    • Numerical simulation of tokamak plasmas
    • A domain decomposition method applied to the simplified transport equations
    • A supernode amalgamation algorithm for an efficient block incomplete factorization
    • A Domain Decomposition Method Applied to Large Eigenvalue Problems in Neutron Physics
    • A NUMA Aware Scheduler for a Parallel Sparse Direct Solver
    • Non-Linear MHD code developement for ELM simulations
    • Toward an International Sparse Linear Algebra Expert System by Interconnecting the ITBL Computational Grid with the Grid-TLSE Platform
    • Tunable parallel experiments in a GridRPC framework: application to linear solvers
    • Dynamic Scheduling for sparse direct Solver on NUMA architectures
    • On finding approximate supernodes for an efficient ILU(k) factorization
    • A supernode amalgamation algorithm for an efficient block incomplete factorization
    • High performances methods for solving large sparse linear systems - Direct and Incomplete Factorization
    • Improvement of existing solvers for the simulation of MHD instabilities
    • Optimisation des performances des outils de calcul de neutronique des coeurs
    • Méthodes directes hautes performances de rśolution en algèbre lin'íre creuse
    • Efficient solution technique for low Mach number compressible multiphase problems
    • On finding approximate supernodes for an efficient ILU(k) factorization
    • Partitioning and Blocking Issues for a Parallel Incomplete Factorization
    • A Parallel Multilevel ILU Factorization based on a Hierarchical Graph Decomposition
    • On using an hybrid MPI-Thread programming for the implementation of a parallel sparse direct solver on a network of SMP nodes
    • Blocking Issues for an Efficient Parallel Block ILU Preconditioner
    • Etude de faisabilité pour la parallĺisation d'un code de m'ánique des fluides en version non structur'e
    • Evaluation des performances de la version SMP du solveur PaStiX de la chaine logicielle EMILIO dans l'environnement du code ODYSSEE
    • Intégration dans ODYSSEE de la chaine logicielle EMILIO
    • Parallel Complete and Incomplete Blockwise Factorisations for Very Large Sparse Systems
    • A Blockwise Algorithm for Parallel Incomplete Cholesky Factorization
    • Using of the High Performance Sparse Solver PaStiX for the Complex Multiscale 3D Simulations performed by the FluidBox Fluid Mechanics Software
    • Applying parallel direct solver skills to build robust and highly performant preconditioners
    • High Performance Complete and Incomplete Factorizations for Very Large Sparse Systems by using Scotch and PaStiX softwares
    • Développement de la phase d'assemblage de la chaîne EMILIO (distribution du maillage et multi-threading)
    • Etude sur l'applicabilité de mt́hodes it'átives nouvelles aux problèmes du CESTA
    • A Parallel ILU factorization based on a Hierarchical Interface Decomposition algorithm
    • Towards High Performance Hybrid Direct-Iterative Solvers for Large Sparse Systems
    • Asymptotically optimal algorithm for Laplace task graphs on heterogeneous platforms
    • Efficient algorithms for direct resolution of large sparse system on clusters of SMP nodes
    • An efficient hybrid MPI/Thread implementation on a network of SMP nodes for the parallel sparse direct solver PaStix: ordering / scheduling / memory managment / out-of-core issues, and application to preconditioning
    • PHIDAL: A Parallel Hierarchical Interface Decomposition Algorithm for solving sparse linear systems
    • Outils numériques parallèles pour la rśolution de trs̀ grands probl`ès d''éctromagn'eśme
    • A Parallel Direct Solver for Very Large Sparse SPD Systems
    • Amélioration et Extension du Solveur Direct Parallèle pour Grandes Matrices Creuses du CESTA
    • Développement de la phase d'assemblage de la chaîne EMILIO pour un solveur parallèle 2D
    • Optimization of a kinetic laser-plasma interaction code for large parallel systems
    • Modélisation de pipelines ht́'ógènes
    • A Parallel Direct Solver for Very Large Sparse SPD Systems
    • Optimisation of a kinetic laser-plasma interaction code for massively parallel systems
    • Parallel factorization of very large sparse SPD systems on a network of SMP nodes
    • Optimisation de l'occupation mémoire pour un solveur parallèle creux direct hautes performances de type supernodal
    • PaStiX: A High-Performance Parallel Direct Solver for Sparse Symmetric Definite Systems
    • Distribution des Données et Rǵulation Statique des Calculs et des Communications pour la R'ólution de Grands Systèmes Lin'eŕes Creux par M'etd́e Directe
    • Scilab to Scilab//, the OURAGAN Project
    • PaStiX: Un solveur parallèle direct pour des matrices creuses symétriques df́inies positives bas'śur un ordonnancement statique performant et sur une gestion m'eíre efficace
    • PaStiX: A Parallel Direct Solver for Sparse SPD Matrices based on Efficient Static Scheduling and Memory Managment
    • Analyse et Etude de Faisabilité de la Rśolution par M'h́ode Directe sur Machine Parallèle de Grands Systm̀es Lin'eŕes Sym'etq́ues D'efiś positifs pour des Probl`ès d''Elecómagn'etismávec Couplage 'El'emt́s ńis -- 'EquationÍnt'egrales
    • Mise en oeuvre d'une Bibliothèque d'Outils pour la Résolution par Mt́hode Directe de Grands Systm̀es Lin'íres Creux Sym'eíques D'efís Positifs sur Machine Parall`è
    • Algèbre Linéaire Creuse Hautes Performances : Application ̀la Ḿ̧anique des Structures
    • Mise en øe uvre d'une Bibliothèque d'Outils pour la Résolution Paralll̀e Hautes Performances par Mt́hode Directe de Grands Syst`ès Lin'íres Creux et application `aǹ Code de M'eńique des Structures
    • Résolution parallèle de grands systm̀es lináires creux
    • Description of the EMILIO Software Processing Chain and Application to Structural Mechanics
    • PaStiX: A High-Performance Parallel Direct Solver for Sparse Symmetric Definite Systems
    • Parallel Sparse Linear Algebra and Application to Structural Mechanics
    • PaStiX: A Parallel Sparse Direct Solver Based on a Static Scheduling for Mixed 1D/2D Block Distributions
    • A scalable parallel assembly for irregular meshes based on a block distribution for a parallel block direct solver
    • Assemblage parallèle d'une matrice et/ou d'un second membre: Application ̀la Parallélisation d'un Code de Ḿ̧anique des Structures
    • Mise en oeuvre d'une Bibliothèque d'Outils pour la Résolution par Mt́hode Directe de Grands Systm̀es Lin'íres Creux Sym'eíques D'efís Positifs sur Machine Parall`è
    • Optimisation de la Communication et de la Distribution des Données pour des Solveurs Parallèles Directs en Algb̀re Lináire Dense et Creuse
    • Parallel Sparse Linear Algebra and Application to Structural Mechanics
    • A Mapping and Scheduling Algorithm for Parallel Sparse Fan-In Numerical Factorization
    • Algèbre Linéaire Creuse Paralll̀e pour les Mt́hodes Directes : Application `l̀a Parall'ísation d'un Code de M'eńique des Structures
    • Mise en oeuvre d'une Bibliothèque d'Outils pour la Résolution par Mt́hode Directe de Grands Systm̀es Lin'íres Creux Sym'eíques D'efís Positifs sur Machine Parall`è
    • Mise en oeuvre d'une Bibliothèque d'Outils pour la Résolution par Mt́hode Directe de Grands Systm̀es Lin'íres Creux Sym'eíques D'efís Positifs sur Machine Parall`è
    • Parallel Sparse Linear Algebra and Application to Structural Mechanics
    • Mise en oeuvre d'une Bibliothèque d'Outils pour la Résolution par Mt́hode Directe de Grands Systm̀es Lin'íres Creux Sym'eíques D'efís Positifs sur Machine Parall`è
    • Calcul de la suite optimale de taille de paquets pour la factorisation de Cholesky
    • Optimisation des Communications et Régulation de Charge pour la Rśolution par M'h́ode Directe de Grands Systèmes Lin'eŕes Creux
    • Calcul de la taille optimale des paquets pour les algorithmes macro-pipelines
    • Optimal Grain Size Computation for Pipelined Algorithms
  • Projects
    • Chameleon
    • SolverStack
    • PaStiX
    • SPM
  • Experience
  • Publications HAL

Memory Optimization to Build a Schur Complement in an Hybrid Solver

Jan 1, 2012·
A. Casadei
,
P. Ramet
· 1 min read
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Last updated on Jan 1, 2012
Sparse
← Fine Grain Scheduling for Sparse Solver on Manycore Architectures Feb 1, 2012
Résolution des systèmes lináires sur calculateurs p'áflopiques Jan 1, 2012 →

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