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Georg Hager

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affiliation: Erlangen National High Performance Computing Center, Germany

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Books and Theses

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2011
[b1]
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Georg Hager, Gerhard Wellein:
Introduction to High Performance Computing for Scientists and Engineers. Chapman and Hall / CRC computational science series, CRC Press 2011, ISBN 978-1-439-81192-4, pp. I-XXV, 1-330

Journal Articles

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2023
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Ayesha Afzal, Georg Hager, Stefano Markidis, Gerhard Wellein:
Making applications faster by asynchronous execution: Slowing down processes or relaxing MPI collectives. Future Gener. Comput. Syst. 148: 472-487 (2023)
[j39]
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Rafael Ravedutti Lucio Machado, Jan Eitzinger, Jan Laukemann, Georg Hager, Harald Köstler, Gerhard Wellein:
MD-Bench: A performance-focused prototyping harness for state-of-the-art short-range molecular dynamics algorithms. Future Gener. Comput. Syst. 149: 25-38 (2023)
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Dominik Ernst, Markus Holzer, Georg Hager, Matthias Knorr, Gerhard Wellein:
Analytical performance estimation during code generation on modern GPUs. J. Parallel Distributed Comput. 173: 152-167 (2023)
[j37]
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Andreas Alvermann, Georg Hager, Holger Fehske:
Orthogonal Layers of Parallelism in Large-Scale Eigenvalue Computations. ACM Trans. Parallel Comput. 10(3): 16:1-16:31 (2023)
[j36]
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Christie L. Alappat, Georg Hager, Olaf Schenk, Gerhard Wellein:
Level-Based Blocking for Sparse Matrices: Sparse Matrix-Power-Vector Multiplication. IEEE Trans. Parallel Distributed Syst. 34(2): 581-597 (2023)
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
The Role of Idle Waves, Desynchronization, and Bottleneck Evasion in the Performance of Parallel Programs. IEEE Trans. Parallel Distributed Syst. 34(2): 623-638 (2023)
2022
[j34]
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
Analytic performance model for parallel overlapping memory-bound kernels. Concurr. Comput. Pract. Exp. 34(10) (2022)
[j33]
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Christie L. Alappat, Nils Meyer, Jan Laukemann, Thomas Gruber, Georg Hager, Gerhard Wellein, Tilo Wettig:
Execution-Cache-Memory modeling and performance tuning of sparse matrix-vector multiplication and Lattice quantum chromodynamics on A64FX. Concurr. Comput. Pract. Exp. 34(20) (2022)
2021
[j32]
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Dominik Ernst, Georg Hager, Jonas Thies, Gerhard Wellein:
Performance engineering for real and complex tall & skinny matrix multiplication kernels on GPUs. Int. J. High Perform. Comput. Appl. 35(1) (2021)
[j31]
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Andreas Pieper, Georg Hager, Holger Fehske:
A domain-specific language and matrix-free stencil code for investigating electronic properties of Dirac and topological materials. Int. J. High Perform. Comput. Appl. 35(1) (2021)
2020
[j30]
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Francesco Cremonesi, Georg Hager, Gerhard Wellein, Felix Schürmann:
Analytic performance modeling and analysis of detailed neuron simulations. Int. J. High Perform. Comput. Appl. 34(4) (2020)
[j29]
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Johannes Hofmann, Christie L. Alappat, Georg Hager, Dietmar Fey, Gerhard Wellein:
Bridging the Architecture Gap: Abstracting Performance-Relevant Properties of Modern Server Processors. Supercomput. Front. Innov. 7(2): 54-78 (2020)
[j28]
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Jonas Thies, Melven Röhrig-Zöllner, Nigel Overmars, Achim Basermann, Dominik Ernst, Georg Hager, Gerhard Wellein:
PHIST: A Pipelined, Hybrid-Parallel Iterative Solver Toolkit. ACM Trans. Math. Softw. 46(4): 31:1-31:26 (2020)
[j27]
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Christie L. Alappat, Achim Basermann, Alan R. Bishop, Holger Fehske, Georg Hager, Olaf Schenk, Jonas Thies, Gerhard Wellein:
A Recursive Algebraic Coloring Technique for Hardware-efficient Symmetric Sparse Matrix-vector Multiplication. ACM Trans. Parallel Comput. 7(3): 19:1-19:37 (2020)
2019
[j26]
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Julian Hornich, Julian Hammer, Georg Hager, Thomas Gruber, Gerhard Wellein:
Collecting and Presenting Reproducible Intranode Stencil Performance: INSPECT. Supercomput. Front. Innov. 6(3): 4-25 (2019)
[j25]
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Faisal Shahzad, Jonas Thies, Moritz Kreutzer, Thomas Zeiser, Georg Hager, Gerhard Wellein:
CRAFT: A Library for Easier Application-Level Checkpoint/Restart and Automatic Fault Tolerance. IEEE Trans. Parallel Distributed Syst. 30(3): 501-514 (2019)
2018
[j24]
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Faisal Shahzad, Moritz Kreutzer, Thomas Zeiser, Rui Machado, Andreas Pieper, Georg Hager, Gerhard Wellein:
Building and utilizing fault tolerance support tools for the GASPI applications. Int. J. High Perform. Comput. Appl. 32(5): 613-626 (2018)
[j23]
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Georg Hager, Gerhard Wellein:
Performance Engineering. Inform. Spektrum 41(5): 323-327 (2018)
[j22]
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Tareq M. Malas, Georg Hager, Hatem Ltaief, David E. Keyes:
Multidimensional Intratile Parallelization for Memory-Starved Stencil Computations. ACM Trans. Parallel Comput. 4(3): 12:1-12:32 (2018)
2017
[j21]
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Johannes Hofmann, Dietmar Fey, Michael Riedmann, Jan Eitzinger, Georg Hager, Gerhard Wellein:
Performance analysis of the Kahan-enhanced scalar product on current multi-core and many-core processors. Concurr. Comput. Pract. Exp. 29(9) (2017)
[j20]
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Moritz Kreutzer, Jonas Thies, Melven Röhrig-Zöllner, Andreas Pieper, Faisal Shahzad, Martin Galgon, Achim Basermann, Holger Fehske, Georg Hager, Gerhard Wellein:
GHOST: Building Blocks for High Performance Sparse Linear Algebra on Heterogeneous Systems. Int. J. Parallel Program. 45(5): 1046-1072 (2017)
2016
[j19]
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Georg Hager, Darren J. Kerbyson, Abhinav Vishnu, Gerhard Wellein:
Performance and power for highly parallel systems. Concurr. Comput. Pract. Exp. 28(2): 187-188 (2016)
[j18]
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Georg Hager, Jan Treibig, Johannes Habich, Gerhard Wellein:
Exploring performance and power properties of modern multi-core chips via simple machine models. Concurr. Comput. Pract. Exp. 28(2): 189-210 (2016)
[j17]
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Markus Wittmann, Georg Hager, Thomas Zeiser, Jan Treibig, Gerhard Wellein:
Chip-level and multi-node analysis of energy-optimized lattice Boltzmann CFD simulations. Concurr. Comput. Pract. Exp. 28(7): 2295-2315 (2016)
[j16]
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Andreas Pieper, Moritz Kreutzer, Andreas Alvermann, Martin Galgon, Holger Fehske, Georg Hager, Bruno Lang, Gerhard Wellein:
High-performance implementation of Chebyshev filter diagonalization for interior eigenvalue computations. J. Comput. Phys. 325: 226-243 (2016)
2015
[j15]
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Tareq M. Malas, Georg Hager, Hatem Ltaief, Holger Stengel, Gerhard Wellein, David E. Keyes:
Multicore-Optimized Wavefront Diamond Blocking for Optimizing Stencil Updates. SIAM J. Sci. Comput. 37(4) (2015)
[j14]
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Melven Röhrig-Zöllner, Jonas Thies, Moritz Kreutzer, Andreas Alvermann, Andreas Pieper, Achim Basermann, Georg Hager, Gerhard Wellein, Holger Fehske:
Increasing the Performance of the Jacobi-Davidson Method by Blocking. SIAM J. Sci. Comput. 37(6) (2015)
2014
[j13]
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Stefan Kronawitter, Holger Stengel, Georg Hager, Christian Lengauer:
Domain-Specific Optimization of Two Jacobi Smoother Kernels and Their Evaluation in the ECM Performance Model. Parallel Process. Lett. 24(3) (2014)
[j12]
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Moritz Kreutzer, Georg Hager, Gerhard Wellein, Holger Fehske, Alan R. Bishop:
A Unified Sparse Matrix Data Format for Efficient General Sparse Matrix-Vector Multiplication on Modern Processors with Wide SIMD Units. SIAM J. Sci. Comput. 36(5) (2014)
2013
[j11]
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Markus Wittmann, Thomas Zeiser, Georg Hager, Gerhard Wellein:
Comparison of different propagation steps for lattice Boltzmann methods. Comput. Math. Appl. 65(6): 924-935 (2013)
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Jan Treibig, Georg Hager, Hannes G. Hofmann, Joachim Hornegger, Gerhard Wellein:
Pushing the limits for medical image reconstruction on recent standard multicore processors. Int. J. High Perform. Comput. Appl. 27(2): 162-177 (2013)
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Faisal Shahzad, Markus Wittmann, Moritz Kreutzer, Thomas Zeiser, Georg Hager, Gerhard Wellein:
A Survey of Checkpoint/Restart Techniques on Distributed Memory Systems. Parallel Process. Lett. 23(4) (2013)
2012
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Klaus Iglberger, Georg Hager, Jan Treibig, Ulrich Rüde:
Expression Templates Revisited: A Performance Analysis of Current Methodologies. SIAM J. Sci. Comput. 34(2) (2012)
2011
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Johannes Habich, Thomas Zeiser, Georg Hager, Gerhard Wellein:
Performance analysis and optimization strategies for a D3Q19 lattice Boltzmann kernel on nVIDIA GPUs using CUDA. Adv. Eng. Softw. 42(5): 266-272 (2011)
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Jan Treibig, Gerhard Wellein, Georg Hager:
Efficient multicore-aware parallelization strategies for iterative stencil computations. J. Comput. Sci. 2(2): 130-137 (2011)
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Christian Feichtinger, Johannes Habich, Harald Köstler, Georg Hager, Ulrich Rüde, Gerhard Wellein:
A flexible Patch-based lattice Boltzmann parallelization approach for heterogeneous GPU-CPU clusters. Parallel Comput. 37(9): 536-549 (2011)
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Gerald Schubert, Holger Fehske, Georg Hager, Gerhard Wellein:
Hybrid-Parallel Sparse Matrix-Vector Multiplication with Explicit Communication Overlap on Current Multicore-Based Systems. Parallel Process. Lett. 21(3): 339-358 (2011)
2010
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Markus Wittmann, Georg Hager, Jan Treibig, Gerhard Wellein:
Leveraging Shared Caches for Parallel Temporal Blocking of Stencil Codes on Multicore Processors and Clusters. Parallel Process. Lett. 20(4): 359-376 (2010)
2009
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Thomas Zeiser, Georg Hager, Gerhard Wellein:
Benchmark Analysis and Application Results for Lattice Boltzmann Simulations on NEC SX Vector and Intel Nehalem Systems. Parallel Process. Lett. 19(4): 491-511 (2009)
2008
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Georg Hager, Thomas Zeiser, Gerhard Wellein:
Data Access Characteristics and Optimizations for Sun UltraSPARC T2 and T2+ Systems. Parallel Process. Lett. 18(4): 471-490 (2008)

Conference and Workshop Papers

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2023
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
Physical Oscillator Model for Supercomputing. SC Workshops 2023: 1229-1235
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
SPEChpc 2021 Benchmarks on Ice Lake and Sapphire Rapids Infiniband Clusters: A Performance and Energy Case Study. SC Workshops 2023: 1245-1254
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Georg Hager:
Application Knowledge Required: Performance Modeling for Fun and Profit. ICPE 2023: 5
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Jan Laukemann, Georg Hager:
Core-Level Performance Engineering with the Open-Source Architecture Code Analyzer (OSACA) and the Compiler Explorer. ICPE (Companion) 2023: 127-131
2022
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Ayesha Afzal, Gerhard Wellein, Georg Hager:
Addressing White-box Modeling and Simulation Challenges in Parallel Computing. SIGSIM-PADS 2022: 25-26
[c47]
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Ayesha Afzal, Georg Hager, Gerhard Wellein, Stefano Markidis:
Exploring Techniques for the Analysis of Spontaneous Asynchronicity in MPI-Parallel Applications. PPAM (1) 2022: 155-170
2021
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Christie L. Alappat, Johannes Seiferth, Georg Hager, Matthias Korch, Thomas Rauber, Gerhard Wellein:
YaskSite: Stencil Optimization Techniques Applied to Explicit ODE Methods on Modern Architectures. CGO 2021: 174-186
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Dominik Ernst, Georg Hager, Matthias Knorr, Gerhard Wellein, Markus Holzer:
Opening the Black Box: Performance Estimation during Code Generation for GPUs. SBAC-PAD 2021: 22-32
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
Analytic Modeling of Idle Waves in Parallel Programs: Communication, Cluster Topology, and Noise Impact. ISC 2021: 351-371
2020
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Christie L. Alappat, Jan Laukemann, Thomas Gruber, Georg Hager, Gerhard Wellein, Nils Meyer, Tilo Wettig:
Performance Modeling of Streaming Kernels and Sparse Matrix-Vector Multiplication on A64FX. PMBS@SC 2020: 1-7
[c42]
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
Desynchronization and Wave Pattern Formation in MPI-Parallel and Hybrid Memory-Bound Programs. ISC 2020: 391-411
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Christie L. Alappat, Johannes Hofmann, Georg Hager, Holger Fehske, Alan R. Bishop, Gerhard Wellein:
Understanding HPC Benchmark Performance on Intel Broadwell and Cascade Lake Processors. ISC 2020: 412-433
2019
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
Propagation and Decay of Injected One-Off Delays on Clusters: A Case Study. CLUSTER 2019: 1-10
[c39]
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Dominik Ernst, Georg Hager, Jonas Thies, Gerhard Wellein:
Performance Engineering for a Tall & Skinny Matrix Multiplication Kernels on GPUs. PPAM (1) 2019: 505-515
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Jan Laukemann, Julian Hammer, Georg Hager, Gerhard Wellein:
Automatic Throughput and Critical Path Analysis of x86 and ARM Assembly Kernels. PMBS@SC 2019: 1-6
2018
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Markus Wittmann, Georg Hager, Radim Janalík, Martin Lanser, Axel Klawonn, Oliver Rheinbach, Olaf Schenk, Gerhard Wellein:
Multicore Performance Engineering of Sparse Triangular Solves Using a Modified Roofline Model. SBAC-PAD 2018: 233-241
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Jan Laukemann, Julian Hammer, Johannes Hofmann, Georg Hager, Gerhard Wellein:
Automated Instruction Stream Throughput Prediction for Intel and AMD Microarchitectures. PMBS@SC 2018: 121-131
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Johannes Hofmann, Georg Hager, Dietmar Fey:
On the Accuracy and Usefulness of Analytic Energy Models for Contemporary Multicore Processors. ISC 2018: 22-43
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Moritz Kreutzer, Dominik Ernst, Alan R. Bishop, Holger Fehske, Georg Hager, Kengo Nakajima, Gerhard Wellein:
Chebyshev Filter Diagonalization on Modern Manycore Processors and GPGPUs. ISC 2018: 329-349
2017
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Thomas Röhl, Jan Eitzinger, Georg Hager, Gerhard Wellein:
LIKWID Monitoring Stack: A Flexible Framework Enabling Job Specific Performance monitoring for the masses. CLUSTER 2017: 781-784
[c32]
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Johannes Hofmann, Georg Hager, Gerhard Wellein, Dietmar Fey:
An Analysis of Core- and Chip-Level Architectural Features in Four Generations of Intel Server Processors. ISC 2017: 294-314
2016
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Johannes Hofmann, Dietmar Fey, Jan Eitzinger, Georg Hager, Gerhard Wellein:
Analysis of Intel's Haswell Microarchitecture Using the ECM Model and Microbenchmarks. ARCS 2016: 210-222
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Tareq M. Malas, Julian Hornich, Georg Hager, Hatem Ltaief, Christoph Pflaum, David E. Keyes:
Optimization of an Electromagnetics Code with Multicore Wavefront Diamond Blocking and Multi-dimensional Intra-Tile Parallelization. IPDPS 2016: 142-151
2015
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Faisal Shahzad, Moritz Kreutzer, Thomas Zeiser, Rui Machado, Andreas Pieper, Georg Hager, Gerhard Wellein:
Building a Fault Tolerant Application Using the GASPI Communication Layer. CLUSTER 2015: 580-587
[c28]
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Holger Stengel, Jan Treibig, Georg Hager, Gerhard Wellein:
Quantifying Performance Bottlenecks of Stencil Computations Using the Execution-Cache-Memory Model. ICS 2015: 207-216
[c27]
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Moritz Kreutzer, Andreas Pieper, Georg Hager, Gerhard Wellein, Andreas Alvermann, Holger Fehske:
Performance Engineering of the Kernel Polynomal Method on Large-Scale CPU-GPU Systems. IPDPS 2015: 417-426
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Johannes Hofmann, Dietmar Fey, Michael Riedmann, Jan Eitzinger, Georg Hager, Gerhard Wellein:
Performance Analysis of the Kahan-Enhanced Scalar Product on Current Multicore Processors. PPAM (1) 2015: 63-73
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Julian Hammer, Georg Hager, Jan Eitzinger, Gerhard Wellein:
Automatic loop kernel analysis and performance modeling with Kerncraft. PMBS@SC 2015: 4:1-4:11
2014
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Johannes Hofmann, Jan Treibig, Georg Hager, Gerhard Wellein:
Performance Engineering for a Medical Imaging Application on the Intel Xeon Phi Accelerator. ARCS Workshops 2014: 1-8
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Andreas Alvermann, Achim Basermann, Holger Fehske, Martin Galgon, Georg Hager, Moritz Kreutzer, Lukas Krämer, Bruno Lang, Andreas Pieper, Melven Röhrig-Zöllner, Faisal Shahzad, Jonas Thies, Gerhard Wellein:
ESSEX: Equipping Sparse Solvers for Exascale. Euro-Par Workshops (2) 2014: 577-588
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Thomas Roehl, Jan Treibig, Georg Hager, Gerhard Wellein:
Overhead Analysis of Performance Counter Measurements. ICPP Workshops 2014: 176-185
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Johannes Hofmann, Jan Treibig, Georg Hager, Gerhard Wellein:
Comparing the performance of different x86 SIMD instruction sets for a medical imaging application on modern multi- and manycore chips. WPMVP@PPoPP 2014: 57-64
2013
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Tobias Scharpff, Klaus Iglberger, Georg Hager, Ulrich Rüde:
Model-guided performance analysis of the sparse matrix-matrix multiplication. HPCS 2013: 445-452
[c19]
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Faisal Shahzad, Markus Wittmann, Thomas Zeiser, Georg Hager, Gerhard Wellein:
An Evaluation of Different I/O Techniques for Checkpoint/Restart. IPDPS Workshops 2013: 1708-1716
2012
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Georg Hager:
Performance Engineering: From Numbers to Insight. Euro-Par Workshops 2012: 393-394
[c17]
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Jan Treibig, Georg Hager, Gerhard Wellein:
Performance Patterns and Hardware Metrics on Modern Multicore Processors: Best Practices for Performance Engineering. Euro-Par Workshops 2012: 451-460
[c16]
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Klaus Iglberger, Georg Hager, Jan Treibig, Ulrich Rüde:
High performance smart expression template math libraries. HPCS 2012: 367-373
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Moritz Kreutzer, Georg Hager, Gerhard Wellein, Holger Fehske, Achim Basermann, Alan R. Bishop:
Sparse Matrix-vector Multiplication on GPGPU Clusters: A New Storage Format and a Scalable Implementation. IPDPS Workshops 2012: 1696-1702
2011
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Gerald Schubert, Georg Hager, Holger Fehske, Gerhard Wellein:
Parallel Sparse Matrix-Vector Multiplication as a Test Case for Hybrid MPI+OpenMP Programming. IPDPS Workshops 2011: 1751-1758
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Jan Treibig, Georg Hager, Gerhard Wellein:
likwid-bench: An Extensible Microbenchmarking Platform for x86 Multicore Compute Nodes. Parallel Tools Workshop 2011: 27-36
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Jan Treibig, Georg Hager, Gerhard Wellein, Michael Meier:
Poster: LIKWID: lightweight performance tools. SC Companion 2011: 29-30
2010
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Jan Treibig, Georg Hager, Gerhard Wellein:
LIKWID: Lightweight Performance Tools. CHPC 2010: 165-175
[c10]
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Jan Treibig, Georg Hager, Gerhard Wellein:
LIKWID: A Lightweight Performance-Oriented Tool Suite for x86 Multicore Environments. ICPP Workshops 2010: 207-216
[c9]
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Markus Wittmann, Georg Hager, Gerhard Wellein:
Multicore-aware parallel temporal blocking of stencil codes for shared and distributed memory. IPDPS Workshops 2010: 1-7
2009
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Gerhard Wellein, Georg Hager, Thomas Zeiser, Markus Wittmann, Holger Fehske:
Efficient Temporal Blocking for Stencil Computations by Multicore-Aware Wavefront Parallelization. COMPSAC (1) 2009: 579-586
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Thomas Zeiser, Georg Hager, Gerhard Wellein:
The world's fastest CPU and SMP node: Some performance results from the NEC SX-9. IPDPS 2009: 1-8
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Rolf Rabenseifner, Georg Hager, Gabriele Jost:
Hybrid MPI/OpenMP Parallel Programming on Clusters of Multi-Core SMP Nodes. PDP 2009: 427-436
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Jan Treibig, Georg Hager:
Introducing a Performance Model for Bandwidth-Limited Loop Kernels. PPAM (1) 2009: 615-624
2008
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Georg Hager, Thomas Zeiser, Gerhard Wellein:
Data access optimizations for highly threaded multi-core CPUs with multiple memory controllers. IPDPS 2008: 1-7
2006
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Rolf Rabenseifner, Georg Hager, Gabriele Jost, Rainer Keller:
Hybrid MPI and OpenMP Parallel Programming. PVM/MPI 2006: 11
2003
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Georg Hager, Eric Jeckelmann, Holger Fehske, Gerhard Wellein:
Exact Numerical Treatment of Finite Quantum Systems Using Leading-Edge Supercomputers. HPSC 2003: 165-177
2002
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Gerhard Wellein, Georg Hager, Achim Basermann, Holger Fehske:
Fast Sparse Matrix-Vector Multiplication for TeraFlop/s Computers. VECPAR 2002: 287-301

Parts in Books or Collections

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2020
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Christie L. Alappat, Andreas Alvermann, Achim Basermann, Holger Fehske, Yasunori Futamura, Martin Galgon, Georg Hager, Sarah Huber, Akira Imakura, Masatoshi Kawai, Moritz Kreutzer, Bruno Lang, Kengo Nakajima, Melven Röhrig-Zöllner, Tetsuya Sakurai, Faisal Shahzad, Jonas Thies, Gerhard Wellein:
ESSEX: Equipping Sparse Solvers For Exascale. Software for Exascale Computing 2020: 143-187
2016
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Jonas Thies, Martin Galgon, Faisal Shahzad, Andreas Alvermann, Moritz Kreutzer, Andreas Pieper, Melven Röhrig-Zöllner, Achim Basermann, Holger Fehske, Georg Hager, Bruno Lang, Gerhard Wellein:
Towards an Exascale Enabled Sparse Solver Repository. Software for Exascale Computing 2016: 295-316
[p2]
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Moritz Kreutzer, Jonas Thies, Andreas Pieper, Andreas Alvermann, Martin Galgon, Melven Röhrig-Zöllner, Faisal Shahzad, Achim Basermann, Alan R. Bishop, Holger Fehske, Georg Hager, Bruno Lang, Gerhard Wellein:
Performance Engineering and Energy Efficiency of Building Blocks for Large, Sparse Eigenvalue Computations on Heterogeneous Supercomputers. Software for Exascale Computing 2016: 317-338
2008
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Thomas Zeiser, Georg Hager, Gerhard Wellein:
Vector Computers in a World of Commodity Clusters, Massively Parallel Systems and Many-Core Many-Threaded CPUs: Recent Experience Based on an Advanced Lattice Boltzmann Flow Solver. High Performance Computing in Science and Engineering 2008: 333-347

Informal and Other Publications

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2023
[i79]
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Ayesha Afzal, Georg Hager, Stefano Markidis, Gerhard Wellein:
Making Applications Faster by Asynchronous Execution: Slowing Down Processes or Relaxing MPI Collectives. CoRR abs/2302.12164 (2023)
[i78]
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  - journals/corr/abs-2302-14660
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Rafael Ravedutti Lucio Machado, Jan Eitzinger, Jan Laukemann, Georg Hager, Harald Köstler, Gerhard Wellein:
MD-Bench: Engineering the in-core performance of short-range molecular dynamics kernels from state-of-the-art simulation packages. CoRR abs/2302.14660 (2023)
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Christie L. Alappat, Jonas Thies, Georg Hager, Holger Fehske, Gerhard Wellein:
Algebraic Temporal Blocking for Sparse Iterative Solvers on Multi-Core CPUs. CoRR abs/2309.02228 (2023)
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
SPEChpc 2021 Benchmarks on Ice Lake and Sapphire Rapids Infiniband Clusters: A Performance and Energy Case Study. CoRR abs/2309.05373 (2023)
[i75]
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
Physical Oscillator Model for Supercomputing. CoRR abs/2310.05701 (2023)
[i74]
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Jan Laukemann, Thomas Gruber, Georg Hager, Dossay Oryspayev, Gerhard Wellein:
CloverLeaf on Intel Multi-Core CPUs: A Case Study in Write-Allocate Evasion. CoRR abs/2311.04797 (2023)
2022
[i73]
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  - journals/corr/abs-2204-14242
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Dominik Ernst, Markus Holzer, Georg Hager, Matthias Knorr, Gerhard Wellein:
Analytical Performance Estimation during Code Generation on Modern GPUs. CoRR abs/2204.14242 (2022)
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Christie L. Alappat, Georg Hager, Olaf Schenk, Gerhard Wellein:
Level-based Blocking for Sparse Matrices: Sparse Matrix-Power-Vector Multiplication. CoRR abs/2205.01598 (2022)
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
The Role of Idle Waves, Desynchronization, and Bottleneck Evasion in the Performance of Parallel Programs. CoRR abs/2205.04190 (2022)
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Ayesha Afzal, Georg Hager, Gerhard Wellein, Stefano Markidis:
Exploring Techniques for the Analysis of Spontaneous Asynchronicity in MPI-Parallel Applications. CoRR abs/2205.13963 (2022)
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Andreas Alvermann, Georg Hager, Holger Fehske:
Orthogonal layers of parallelism in large-scale eigenvalue computations. CoRR abs/2209.01974 (2022)
2021
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Christie L. Alappat, Nils Meyer, Jan Laukemann, Thomas Gruber, Georg Hager, Gerhard Wellein, Tilo Wettig:
ECM modeling and performance tuning of SpMV and Lattice QCD on A64FX. CoRR abs/2103.03013 (2021)
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
Analytic Modeling of Idle Waves in Parallel Programs: Communication, Cluster Topology, and Noise Impact. CoRR abs/2103.03175 (2021)
[i66]
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Dominik Ernst, Georg Hager, Markus Holzer, Matthias Knorr, Gerhard Wellein:
Opening the Black Box: Performance Estimation during Code Generation for GPUs. CoRR abs/2107.01143 (2021)
2020
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  - journals/corr/abs-2002-02989
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
Desynchronization and Wave Pattern Formation in MPI-Parallel and Hybrid Memory-Bound Programs. CoRR abs/2002.02989 (2020)
[i64]
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Christie L. Alappat, Johannes Hofmann, Georg Hager, Holger Fehske, Alan R. Bishop, Gerhard Wellein:
Understanding HPC Benchmark Performance on Intel Broadwell and Cascade Lake Processors. CoRR abs/2002.03344 (2020)
[i63]
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  - journals/corr/abs-2009-13903
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Christie L. Alappat, Jan Laukemann, Thomas Gruber, Georg Hager, Gerhard Wellein, Nils Meyer, Tilo Wettig:
Performance Modeling of Streaming Kernels and Sparse Matrix-Vector Multiplication on A64FX. CoRR abs/2009.13903 (2020)
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  - journals/corr/abs-2011-00243
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
An analytic performance model for overlapping execution of memory-bound loop kernels on multicore CPUs. CoRR abs/2011.00243 (2020)
2019
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Francesco Cremonesi, Georg Hager, Gerhard Wellein, Felix Schürmann:
Analytic Performance Modeling and Analysis of Detailed Neuron Simulations. CoRR abs/1901.05344 (2019)
[i60]
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Dominik Ernst, Georg Hager, Jonas Thies, Gerhard Wellein:
Performance Engineering for a Tall & Skinny Matrix Multiplication Kernel on GPUs. CoRR abs/1905.03136 (2019)
[i59]
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Ayesha Afzal, Georg Hager, Gerhard Wellein:
Delay Propagation and Overlapping Mechanisms on Clusters: A Case Study of Idle Periods based on Workload, Communication, and Delay Granularity. CoRR abs/1905.10603 (2019)
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Julian Hornich, Julian Hammer, Georg Hager, Thomas Gruber, Gerhard Wellein:
Collecting and Presenting Reproducible Intranode Stencil Performance: INSPECT. CoRR abs/1906.08138 (2019)
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Johannes Hofmann, Christie L. Alappat, Georg Hager, Dietmar Fey, Gerhard Wellein:
Bridging the Architecture Gap: Abstracting Performance-Relevant Properties of Modern Server Processors. CoRR abs/1907.00048 (2019)
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Christie L. Alappat, Georg Hager, Olaf Schenk, Jonas Thies, Achim Basermann, Alan R. Bishop, Holger Fehske, Gerhard Wellein:
A Recursive Algebraic Coloring Technique for Hardware-Efficient Symmetric Sparse Matrix-Vector Multiplication. CoRR abs/1907.06487 (2019)
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Jan Laukemann, Julian Hammer, Georg Hager, Gerhard Wellein:
Automatic Throughput and Critical Path Analysis of x86 and ARM Assembly Kernels. CoRR abs/1910.00214 (2019)
2018
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Johannes Hofmann, Georg Hager, Dietmar Fey:
On the accuracy and usefulness of analytic energy models for contemporary multicore processors. CoRR abs/1803.01618 (2018)
[i53]
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Moritz Kreutzer, Georg Hager, Dominik Ernst, Holger Fehske, Alan R. Bishop, Gerhard Wellein:
Chebyshev Filter Diagonalization on Modern Manycore Processors and GPGPUs. CoRR abs/1803.02156 (2018)
[i52]
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  - journals/corr/abs-1809-00912
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Jan Laukemann, Julian Hammer, Johannes Hofmann, Georg Hager, Gerhard Wellein:
Automated Instruction Stream Throughput Prediction for Intel and AMD Microarchitectures. CoRR abs/1809.00912 (2018)
2017
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Julian Hammer, Jan Eitzinger, Georg Hager, Gerhard Wellein:
Kerncraft: A Tool for Analytic Performance Modeling of Loop Kernels. CoRR abs/1702.04653 (2017)
[i50]
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Johannes Hofmann, Georg Hager, Gerhard Wellein, Dietmar Fey:
An analysis of core- and chip-level architectural features in four generations of Intel server processors. CoRR abs/1702.07554 (2017)
[i49]
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Thomas Röhl, Jan Eitzinger, Georg Hager, Gerhard Wellein:
LIKWID Monitoring Stack: A flexible framework enabling job specific performance monitoring for the masses. CoRR abs/1708.01476 (2017)
[i48]
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Faisal Shahzad, Jonas Thies, Moritz Kreutzer, Thomas Zeiser, Georg Hager, Gerhard Wellein:
CRAFT: A library for easier application-level Checkpoint/Restart and Automatic Fault Tolerance. CoRR abs/1708.02030 (2017)
[i47]
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Andreas Pieper, Georg Hager, Holger Fehske:
PVSC-DTM: A domain-specific language and matrix-free stencil code for investigating electronic properties of Dirac and topological materials. CoRR abs/1708.09689 (2017)
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Thomas Röhl, Jan Eitzinger, Georg Hager, Gerhard Wellein:
Validation of hardware events for successful performance pattern identification in High Performance Computing. CoRR abs/1710.04094 (2017)
2016
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Johannes Hofmann, Dietmar Fey, Michael Riedmann, Jan Eitzinger, Georg Hager, Gerhard Wellein:
Performance analysis of the Kahan-enhanced scalar product on current multi- and manycore processors. CoRR abs/1604.01890 (2016)
2015
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Johannes Hofmann, Dietmar Fey, Jan Eitzinger, Georg Hager, Gerhard Wellein:
Performance analysis of the Kahan-enhanced scalar product on current multicore processors. CoRR abs/1505.02586 (2015)
[i43]
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Faisal Shahzad, Moritz Kreutzer, Thomas Zeiser, Rui Machado, Andreas Pieper, Georg Hager, Gerhard Wellein:
Building a fault tolerant application using the GASPI communication layer. CoRR abs/1505.04628 (2015)
[i42]
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Markus Wittmann, Thomas Zeiser, Georg Hager, Gerhard Wellein:
Short Note on Costs of Floating Point Operations on current x86-64 Architectures: Denormals, Overflow, Underflow, and Division by Zero. CoRR abs/1506.03997 (2015)
[i41]
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Moritz Kreutzer, Jonas Thies, Melven Röhrig-Zöllner, Andreas Pieper, Faisal Shahzad, Martin Galgon, Achim Basermann, Holger Fehske, Georg Hager, Gerhard Wellein:
GHOST: Building blocks for high performance sparse linear algebra on heterogeneous systems. CoRR abs/1507.08101 (2015)
[i40]
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Julian Hammer, Georg Hager, Jan Eitzinger, Gerhard Wellein:
Automatic Loop Kernel Analysis and Performance Modeling With Kerncraft. CoRR abs/1509.03778 (2015)
[i39]
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Andreas Pieper, Moritz Kreutzer, Martin Galgon, Andreas Alvermann, Holger Fehske, Georg Hager, Bruno Lang, Gerhard Wellein:
High-performance implementation of Chebyshev filter diagonalization for interior eigenvalue computations. CoRR abs/1510.04895 (2015)
[i38]
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Tareq M. Malas, Georg Hager, Hatem Ltaief, David E. Keyes:
Multi-dimensional intra-tile parallelization for memory-starved stencil computations. CoRR abs/1510.04995 (2015)
[i37]
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Tareq M. Malas, Julian Hornich, Georg Hager, Hatem Ltaief, Christoph Pflaum, David E. Keyes:
Optimization of an electromagnetics code with multicore wavefront diamond blocking and multi-dimensional intra-tile parallelization. CoRR abs/1510.05218 (2015)
[i36]
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Johannes Hofmann, Dietmar Fey, Jan Eitzinger, Georg Hager, Gerhard Wellein:
Analysis of Intel's Haswell Microarchitecture Using The ECM Model and Microbenchmarks. CoRR abs/1511.03639 (2015)
2014
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Johannes Hofmann, Jan Treibig, Georg Hager, Gerhard Wellein:
Performance Engineering for a Medical Imaging Application on the Intel Xeon Phi Accelerator. CoRR abs/1401.3615 (2014)
[i34]
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Johannes Hofmann, Jan Treibig, Georg Hager, Gerhard Wellein:
Comparing the Performance of Different x86 SIMD Instruction Sets for a Medical Imaging Application on Modern Multi- and Manycore Chips. CoRR abs/1401.7494 (2014)
[i33]
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Markus Wittmann, Thomas Zeiser, Georg Hager, Gerhard Wellein:
Modeling and analyzing performance for highly optimized propagation steps of the lattice Boltzmann method on sparse lattices. CoRR abs/1410.0412 (2014)
[i32]
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Tareq M. Malas, Georg Hager, Hatem Ltaief, Holger Stengel, Gerhard Wellein, David E. Keyes:
Multicore-optimized wavefront diamond blocking for optimizing stencil updates. CoRR abs/1410.3060 (2014)
[i31]
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Holger Stengel, Jan Treibig, Georg Hager, Gerhard Wellein:
Quantifying performance bottlenecks of stencil computations using the Execution-Cache-Memory model. CoRR abs/1410.5010 (2014)
[i30]
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Moritz Kreutzer, Georg Hager, Gerhard Wellein, Andreas Pieper, Andreas Alvermann, Holger Fehske:
Performance Engineering of the Kernel Polynomial Method on Large-Scale CPU-GPU Systems. CoRR abs/1410.5242 (2014)
[i29]
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Tareq M. Malas, Georg Hager, Hatem Ltaief, David E. Keyes:
Towards energy efficiency and maximum computational intensity for stencil algorithms using wavefront diamond temporal blocking. CoRR abs/1410.5561 (2014)
2013
[i28]
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  - journals/corr/abs-1302-4280
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Markus Wittmann, Georg Hager, Thomas Zeiser, Gerhard Wellein:
Asynchronous MPI for the Masses. CoRR abs/1302.4280 (2013)
[i27]
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Tobias Scharpff, Klaus Iglberger, Georg Hager, Ulrich Rüde:
Model-guided Performance Analysis of the Sparse Matrix-Matrix Multiplication. CoRR abs/1303.1651 (2013)
[i26]
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Christoph Scheit, Georg Hager, Jan Treibig, Stefan Becker, Gerhard Wellein:
Optimization of FASTEST-3D for Modern Multicore Systems. CoRR abs/1303.4538 (2013)
[i25]
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Markus Wittmann, Georg Hager, Thomas Zeiser, Gerhard Wellein:
An analysis of energy-optimized lattice-Boltzmann CFD simulations from the chip to the highly parallel level. CoRR abs/1304.7664 (2013)
[i24]
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Moritz Kreutzer, Georg Hager, Gerhard Wellein, Holger Fehske, Alan R. Bishop:
A unified sparse matrix data format for modern processors with wide SIMD units. CoRR abs/1307.6209 (2013)
2012
[i23]
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Jan Treibig, Georg Hager, Gerhard Wellein:
Best practices for HPM-assisted performance engineering on modern multicore processors. CoRR abs/1206.3738 (2012)
[i22]
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  - journals/corr/abs-1208-2908
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Georg Hager, Jan Treibig, Johannes Habich, Gerhard Wellein:
Exploring performance and power properties of modern multicore chips via simple machine models. CoRR abs/1208.2908 (2012)
2011
[i21]
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  - journals/corr/abs-1101-0091
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Gerald Schubert, Georg Hager, Holger Fehske, Gerhard Wellein:
Parallel sparse matrix-vector multiplication as a test case for hybrid MPI+OpenMP programming. CoRR abs/1101.0091 (2011)
[i20]
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  - journals/corr/abs-1101-0093
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Markus Wittmann, Georg Hager:
Optimizing ccNUMA locality for task-parallel execution under OpenMP and TBB on multicore-based systems. CoRR abs/1101.0093 (2011)
[i19]
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  - journals/corr/abs-1104-1729
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Klaus Iglberger, Georg Hager, Jan Treibig, Ulrich Rüde:
Expression Templates Revisited: A Performance Analysis of the Current ET Methodology. CoRR abs/1104.1729 (2011)
[i18]
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  - journals/corr/abs-1104-4874
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Jan Treibig, Georg Hager, Gerhard Wellein:
LIKWID: Lightweight Performance Tools. CoRR abs/1104.4874 (2011)
[i17]
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  - journals/corr/abs-1104-5243
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Jan Treibig, Georg Hager, Hannes G. Hofmann, Joachim Hornegger, Gerhard Wellein:
Pushing the limits for medical image reconstruction on recent standard multicore processors. CoRR abs/1104.5243 (2011)
[i16]
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  - journals/corr/abs-1106-5908
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Gerald Schubert, Holger Fehske, Georg Hager, Gerhard Wellein:
Hybrid-parallel sparse matrix-vector multiplication with explicit communication overlap on current multicore-based systems. CoRR abs/1106.5908 (2011)
[i15]
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  - journals/corr/abs-1111-0922
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Markus Wittmann, Thomas Zeiser, Georg Hager, Gerhard Wellein:
Comparison of different Propagation Steps for the Lattice Boltzmann Method. CoRR abs/1111.0922 (2011)
[i14]
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  - journals/corr/abs-1111-1129
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Markus Wittmann, Thomas Zeiser, Georg Hager, Gerhard Wellein:
Domain decomposition and locality optimization for large-scale lattice Boltzmann simulations. CoRR abs/1111.1129 (2011)
[i13]
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  - journals/corr/abs-1112-0850
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Johannes Habich, Christian Feichtinger, Harald Köstler, Georg Hager, Gerhard Wellein:
Performance engineering for the Lattice Boltzmann method on GPGPUs: Architectural requirements and performance results. CoRR abs/1112.0850 (2011)
[i12]
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  - journals/corr/abs-1112-5588
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Moritz Kreutzer, Georg Hager, Gerhard Wellein, Holger Fehske, Achim Basermann, Alan R. Bishop:
Sparse matrix-vector multiplication on GPGPU clusters: A new storage format and a scalable implementation. CoRR abs/1112.5588 (2011)
2010
[i11]
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  - journals/corr/abs-1004-1741
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Jan Treibig, Gerhard Wellein, Georg Hager:
Efficient multicore-aware parallelization strategies for iterative stencil computations. CoRR abs/1004.1741 (2010)
[i10]
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  - journals/corr/abs-1004-4431
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Jan Treibig, Georg Hager, Gerhard Wellein:
LIKWID: A lightweight performance-oriented tool suite for x86 multicore environments. CoRR abs/1004.4431 (2010)
[i9]
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  - journals/corr/abs-1006-3148
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Markus Wittmann, Georg Hager, Jan Treibig, Gerhard Wellein:
Leveraging shared caches for parallel temporal blocking of stencil codes on multicore processors and clusters. CoRR abs/1006.3148 (2010)
[i8]
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  - journals/corr/abs-1007-1388
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Christian Feichtinger, Johannes Habich, Harald Köstler, Georg Hager, Ulrich Rüde, Gerhard Wellein:
A Flexible Patch-Based Lattice Boltzmann Parallelization Approach for Heterogeneous GPU-CPU Clusters. CoRR abs/1007.1388 (2010)
2009
[i7]
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  - journals/corr/abs-0902-1884
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Markus Wittmann, Georg Hager:
A Proof of Concept for Optimizing Task Parallelism by Locality Queues. CoRR abs/0902.1884 (2009)
[i6]
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  - journals/corr/abs-0905-0792
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Jan Treibig, Georg Hager:
Introducing a Performance Model for Bandwidth-Limited Loop Kernels. CoRR abs/0905.0792 (2009)
[i5]
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  - journals/corr/abs-0910-4836
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Gerald Schubert, Georg Hager, Holger Fehske:
Performance limitations for sparse matrix-vector multiplications on current multicore environments. CoRR abs/0910.4836 (2009)
[i4]
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  - journals/corr/abs-0910-4865
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Jan Treibig, Georg Hager, Gerhard Wellein:
Multi-core architectures: Complexities of performance prediction and the impact of cache topology. CoRR abs/0910.4865 (2009)
[i3]
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  - journals/corr/abs-0912-4506
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Markus Wittmann, Georg Hager, Gerhard Wellein:
Multicore-aware parallel temporal blocking of stencil codes for shared and distributed memory. CoRR abs/0912.4506 (2009)
2007
[i2]
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  - journals/corr/abs-0712-2302
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  - https://dblp.org/rec/journals/corr/abs-0712-2302
Georg Hager, Thomas Zeiser, Gerhard Wellein:
Data access optimizations for highly threaded multi-core CPUs with multiple memory controllers. CoRR abs/0712.2302 (2007)
[i1]
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  - journals/corr/abs-0712-3389
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Georg Hager, Holger Stengel, Thomas Zeiser, Gerhard Wellein:
RZBENCH: Performance evaluation of current HPC architectures using low-level and application benchmarks. CoRR abs/0712.3389 (2007)

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