Toshiyuki Imamura

Publication Activity (10 Years)

Years Active: 2000-2023
Publications (10 Years): 47

Top Topics

Conjugate Gradient

Top Venues

IPDPS Workshops

Publications

Daichi Mukunoki, Masatoshi Kawai, Toshiyuki Imamura
Sparse Matrix-Vector Multiplication with Reduced-Precision Memory Accessor. MCSoC (2023)
Takuya Ina, Yasuhiro Idomura, Toshiyuki Imamura, Naoyuki Onodera
A new data conversion method for mixed precision Krylov solvers with FP16/BF16 Jacobi preconditioners. HPC Asia (2023)
Yuta Hasegawa, Toshiyuki Imamura, Takuya Ina, Naoyuki Onodera, Yuuichi Asahi, Yasuhiro Idomura
GPU Optimization of Lattice Boltzmann Method with Local Ensemble Transform Kalman Filter. CoRR (2023)
Daichi Mukunoki, Katsuhisa Ozaki, Takeshi Ogita, Toshiyuki Imamura
Infinite-Precision Inner Product and Sparse Matrix-Vector Multiplication Using Ozaki Scheme with Dot2 on Manycore Processors. PPAM (1) (2022)
Susumu Yamada, Toshiyuki Imamura, Masahiko Machida
High Performance Parallel LOBPCG Method for Large Hamiltonian Derived from Hubbard Model on Multi-GPU Systems. SCFA (2022)
Yuta Hasegawa, Toshiyuki Imamura, Takuya Ina, Naoyuki Onodera, Yuuichi Asahi, Yasuhiro Idomura
GPU Optimization of Lattice Boltzmann Method with Local Ensemble Transform Kalman Filter. ScalAH@SC (2022)
Daichi Mukunoki, Katsuhisa Ozaki, Takeshi Ogita, Toshiyuki Imamura
Accurate Matrix Multiplication on Binary128 Format Accelerated by Ozaki Scheme. ICPP (2021)
Steven Farrell, Murali Emani, Jacob Balma, Lukas Drescher, Aleksandr Drozd, Andreas Fink, Geoffrey C. Fox, David Kanter, Thorsten Kurth, Peter Mattson, Dawei Mu, Amit Ruhela, Kento Sato, Koichi Shirahata, Tsuguchika Tabaru, Aristeidis Tsaris, Jan Balewski, Ben Cumming, Takumi Danjo, Jens Domke, Takaaki Fukai, Naoto Fukumoto, Tatsuya Fukushi, Balazs Gerofi, Takumi Honda, Toshiyuki Imamura, Akihiko Kasagi, Kentaro Kawakami, Shuhei Kudo, Akiyoshi Kuroda, Maxime Martinasso, Satoshi Matsuoka, Henrique Mendonça, Kazuki Minami, Prabhat Ram, Takashi Sawada, Mallikarjun Shankar, Tom St. John, Akihiro Tabuchi, Venkatram Vishwanath, Mohamed Wahib, Masafumi Yamazaki, Junqi Yin
MLPerf™ HPC: A Holistic Benchmark Suite for Scientific Machine Learning on HPC Systems. MLHPC@SC (2021)
Steven Farrell, Murali Emani, Jacob Balma, Lukas Drescher, Aleksandr Drozd, Andreas Fink, Geoffrey C. Fox, David Kanter, Thorsten Kurth, Peter Mattson, Dawei Mu, Amit Ruhela, Kento Sato, Koichi Shirahata, Tsuguchika Tabaru, Aristeidis Tsaris, Jan Balewski, Ben Cumming, Takumi Danjo, Jens Domke, Takaaki Fukai, Naoto Fukumoto, Tatsuya Fukushi, Balazs Gerofi, Takumi Honda, Toshiyuki Imamura, Akihiko Kasagi, Kentaro Kawakami, Shuhei Kudo, Akiyoshi Kuroda, Maxime Martinasso, Satoshi Matsuoka, Henrique Mendonça, Kazuki Minami, Prabhat Ram, Takashi Sawada, Mallikarjun Shankar, Tom St. John, Akihiro Tabuchi, Venkatram Vishwanath, Mohamed Wahib, Masafumi Yamazaki, Junqi Yin
MLPerf HPC: A Holistic Benchmark Suite for Scientific Machine Learning on HPC Systems. CoRR (2021)
Takuya Ina, Yasuhiro Idomura, Toshiyuki Imamura, Susumu Yamashita, Naoyuki Onodera
Iterative methods with mixed-precision preconditioning for ill-conditioned linear systems in multiphase CFD simulations. ScalA@SC (2021)
Takeyuki Harayama, Shuhei Kudo, Daichi Mukunoki, Toshiyuki Imamura, Daisuke Takahashi
A Rapid Euclidean Norm Calculation Algorithm that Reduces Overflow and Underflow. ICCSA (1) (2021)
Daichi Mukunoki, Yusuke Hirota, Toshiyuki Imamura
Task Scheduling Strategies for Batched Basic Linear Algebra Subprograms on Many-core CPUs. MCSoC (2021)
Fabienne Jézéquel, Stef Graillat, Daichi Mukunoki, Toshiyuki Imamura, Roman Iakymchuk
Can We Avoid Rounding-Error Estimation in HPC Codes and Still Get Trustworthy Results? VSTTE (2020)
Yiyu Tan, Toshiyuki Imamura
An FPGA-based Sound Field Rendering System. CLUSTER (2020)
Hisashi Yashiro, Koji Terasaki, Yuta Kawai, Shuhei Kudo, Takemasa Miyoshi, Toshiyuki Imamura, Kazuo Minami, Hikaru Inoue, Tatsuo Nishiki, Takayuki Saji, Masaki Satoh, Hirofumi Tomita
A 1024-member ensemble data assimilation with 3.5-km mesh global weather simulations. SC (2020)
Shuhei Kudo, Keigo Nitadori, Takuya Ina, Toshiyuki Imamura
Prompt Report on Exa-Scale HPL-AI Benchmark. CLUSTER (2020)
Yasuhiro Idomura, Takuya Ina, Yussuf Ali, Toshiyuki Imamura
Acceleration of fusion plasma turbulence simulations using the mixed-precision communication-avoiding krylov method. SC (2020)
Shuhei Kudo, Keigo Nitadori, Takuya Ina, Toshiyuki Imamura
Implementation and Numerical Techniques for One EFlop/s HPL-AI Benchmark on Fugaku. ScalA@SC (2020)
Daichi Mukunoki, Katsuhisa Ozaki, Takeshi Ogita, Toshiyuki Imamura
DGEMM Using Tensor Cores, and Its Accurate and Reproducible Versions. ISC (2020)
Shuhei Kudo, Yusaku Yamamoto, Toshiyuki Imamura
Error Analysis of the Cholesky QR-Based Block Orthogonalization Process for the One-Sided Block Jacobi SVD Algorithm. Comput. Informatics 39 (6) (2020)
Roman Iakymchuk, Daichi Mukunoki, Artur Podobas, Fabienne Jézéquel, Toshiyuki Imamura, Norihisa Fujita, Jens Huthmann, Shuhei Kudo, Yiyu Tan, Jens Domke, Kai Torben Ohlhus, Takeshi Fukaya, Takeo Hoshi, Yuki Murakami, Maho Nakata, Takeshi Ogita, Kentaro Sano, Taisuke Boku
White Paper from Workshop on Large-scale Parallel Numerical Computing Technology (LSPANC 2020): HPC and Computer Arithmetic toward Minimal-Precision Computing. CoRR (2020)
Susumu Yamada, Masahiko Machida, Toshiyuki Imamura
High Performance Eigenvalue Solver for Hubbard Model: Tuning Strategies for LOBPCG Method on CUDA GPU. PARCO (2019)
Toshiyuki Imamura, Masaaki Aoki, Mitsuo Yokokawa
Batched 3D-Distributed FFT Kernels Towards Practical DNS Codes. PARCO (2019)
Shuhei Kudo, Toshiyuki Imamura
Cache-efficient implementation and batching of tridiagonalization on manycore CPUs. HPC Asia (2019)
Yiyu Tan, Toshiyuki Imamura, Daichi Mukunoki
Design of an FPGA-Based Matrix Multiplier with Task Parallelism. PARCO (2019)
Haruka Yamada, Akira Imakura, Toshiyuki Imamura, Tetsuya Sakurai
Optimization of Reordering Procedures in HOTRG for Distributed Parallel Computing. IPDPS Workshops (2018)
Yiyu Tan, Toshiyuki Imamura
Performance Evaluation of a Toolkit for Sparse Tensor Decomposition. HPDC (Posters/Doctoral Consortium) (2018)
Takeshi Fukaya, Toshiyuki Imamura, Yusaku Yamamoto
A Case Study on Modeling the Performance of Dense Matrix Computation: Tridiagonalization in the EigenExa Eigensolver on the K Computer. IPDPS Workshops (2018)
Daichi Mukunoki, Toshiyuki Imamura
Performance Analysis of 2D-compatible 2.5D-PDGEMM on Knights Landing Cluster. ICCS (3) (2018)
Susumu Yamada, Toshiyuki Imamura, Masahiko Machida
High Performance LOBPCG Method for Solving Multiple Eigenvalues of Hubbard Model: Efficiency of Communication Avoiding Neumann Expansion Preconditioner. SCFA (2018)
Yasuhiro Idomura, Takuya Ina, Akie Mayumi, Susumu Yamada, Toshiyuki Imamura
Application of a Preconditioned Chebyshev Basis Communication-Avoiding Conjugate Gradient Method to a Multiphase Thermal-Hydraulic CFD Code. SCFA (2018)
Susumu Yamada, Toshiyuki Imamura, Masahiko Machida
Communication Avoiding Neumann Expansion Preconditioner for LOBPCG Method: Convergence Property of Exact Diagonalization Method for Hubbard Model. PARCO (2017)
Toshiyuki Imamura, Daichi Mukunoki, Yusuke Hirota, Susumu Yamada, Masahiko Machida
Design Towards Modern High Performance Numerical LA Library Enabling Heterogeneity and Flexible Data Formats. PARCO (2017)
Daichi Mukunoki, Toshiyuki Imamura
Implementation and Performance Analysis of 2.5D-PDGEMM on the K Computer. PPAM (1) (2017)
Susumu Yamada, Toshiyuki Imamura, Takuya Ina, Narimasa Sasa, Yasuhiro Idomura, Masahiko Machida
Quadruple-Precision BLAS Using Bailey's Arithmetic with FMA Instruction: Its Performance and Applications. IPDPS Workshops (2017)
Yasuhiro Idomura, Takuya Ina, Akie Mayumi, Susumu Yamada, Kazuya Matsumoto, Yuuichi Asahi, Toshiyuki Imamura
Application of a communication-avoiding generalized minimal residual method to a gyrokinetic five dimensional eulerian code on many core platforms. ScalA@SC (2017)
Yiyu Tan, Toshiyuki Imamura
An energy-efficient FPGA-based matrix multiplier. ICECS (2017)
Yusuke Hirota, Toshiyuki Imamura
Parallel Divide-and-Conquer Algorithm for Solving Tridiagonal Eigenvalue Problems on Manycore Systems. PPAM (1) (2017)
Daichi Mukunoki, Toshiyuki Imamura
Reduced-Precision Floating-Point Formats on GPUs for High Performance and Energy Efficient Computation. CLUSTER (2016)
Daichi Mukunoki, Toshiyuki Imamura, Daisuke Takahashi
Automatic Thread-Block Size Adjustment for Memory-Bound BLAS Kernels on GPUs. MCSoC (2016)
Akie Mayumi, Yasuhiro Idomura, Takuya Ina, Susumu Yamada, Toshiyuki Imamura
Left-Preconditioned Communication-Avoiding Conjugate Gradient Methods for Multiphase CFD Simulations on the K Computer. ScalA@SC (2016)
Jaewoon Jung, Chigusa Kobayashi, Toshiyuki Imamura, Yuji Sugita
Parallel implementation of 3D FFT with volumetric decomposition schemes for efficient molecular dynamics simulations. Comput. Phys. Commun. 200 (2016)
Susumu Yamada, Toshiyuki Imamura, Masahiko Machida
High Performance Eigenvalue Solver in Exact-diagonalization Method for Hubbard Model on CUDA GPU. PARCO (2015)
Yosuke Kumagai, Akihiro Fujii, Teruo Tanaka, Yusuke Hirota, Takeshi Fukaya, Toshiyuki Imamura, Reiji Suda
Performance Analysis of the Chebyshev Basis Conjugate Gradient Method on the K Computer. PPAM (1) (2015)
Daichi Mukunoki, Toshiyuki Imamura, Daisuke Takahashi
Fast Implementation of General Matrix-Vector Multiplication (GEMV) on Kepler GPUs. PDP (2015)
Takeshi Fukaya, Toshiyuki Imamura
Performance Evaluation of the Eigen Exa Eigensolver on Oakleaf-FX: Tridiagonalization Versus Pentadiagonalization. IPDPS Workshops (2015)
Toshiyuki Imamura, Takeshi Fukaya, Yusuke Hirota, Susumu Yamada, Masahiko Machida
CAHTR: Communication-Avoiding Householder TRidiagonalization. PARCO (2015)
Chongke Bi, Kenji Ono, Kwan-Liu Ma, Haiyuan Wu, Toshiyuki Imamura
A Study of Parallel Data Compression Using Proper Orthogonal Decomposition on the K Computer. EGPGV@EuroVis (2014)
Takeshi Fukaya, Toshiyuki Imamura, Yusaku Yamamoto
Performance Analysis of the Householder-Type Parallel Tall-Skinny QR Factorizations Toward Automatic Algorithm Selection. VECPAR (2014)
Teruo Tanaka, Ryo Otsuka, Akihiro Fujii, Takahiro Katagiri, Toshiyuki Imamura
Implementation of d-Spline-based incremental performance parameter estimation method with ppOpen-AT. Sci. Program. 22 (4) (2014)
Yasuhiro Idomura, Motoki Nakata, Susumu Yamada, Masahiko Machida, Toshiyuki Imamura, Tomohiko Watanabe, Masanori Nunami, Hikaru Inoue, Shigenobu Tsutsumi, Ikuo Miyoshi, Naoyuki Shida
Communication-overlap techniques for improved strong scaling of gyrokinetic Eulerian code beyond 100k cores on the K-computer. Int. J. High Perform. Comput. Appl. 28 (1) (2014)
Susumu Yamada, Toshiyuki Imamura, Masahiko Machida
Parallel Computing Design for Exact Diagonalization Scheme on Multi-band Hubbard Cluster Models. PARCO (2013)
Chongke Bi, Kenji Ono, Kwan-Liu Ma, Haiyuan Wu, Toshiyuki Imamura
Proper orthogonal decomposition based parallel compression for visualizing big data on the K computer. LDAV (2013)
Toshiyuki Imamura, Susumu Yamada, Masahiko Machida
Eigen-G: GPU-Based Eigenvalue Solver for Real-Symmetric Dense Matrices. PPAM (1) (2013)
Toshiyuki Imamura, Susumu Yamada, Masahiko Machida
A High Performance SYMV Kernel on a Fermi-core GPU. VECPAR (2012)
Yasuhiro Idomura, Motoki Nakata, Susumu Yamada, Masahiko Machida, Toshiyuki Imamura, Tomohiko Watanabe, Masanori Nunami, Hikaru Inoue, Shigenobu Tsutsumi, Ikuo Miyoshi, Naoyuki Shida
Abstract: Communication Overlap Techniques for Improved Strong Scaling of Gyrokinetic Eulerian Code beyond 100k Cores on the K-Computer. SC Companion (2012)
Yasuhiro Idomura, Motoki Nakata, Susumu Yamada, Masahiko Machida, Toshiyuki Imamura, Tomohiko Watanabe, Masanori Nunami, Hikaru Inoue, Shigenobu Tsutsumi, Ikuo Miyoshi, Naoyuki Shida
Poster: Communication Overlap Techniques for Improved Strong Scaling of Gyrokinetic Eulerian Code beyond 100k Cores on the K-Computer. SC Companion (2012)
Toshiyuki Imamura, Susumu Yamada, Masahiko Machida
Poster: Preliminary Report for a High Precision Distributed Memory Parallel Eigenvalue Solver. SC Companion (2012)
Toshiyuki Imamura, Susumu Yamada, Masahiko Machida
Abstract: Preliminary Report for a High Precision Distributed Memory Parallel Eigenvalue Solver. SC Companion (2012)
Susumu Yamada, Toshiyuki Imamura, Masahiko Machida
Parallelization design on multi-core platforms in density matrix renormalization group toward 2-D quantum strongly-correlated systems. SC (2011)
Toshiyuki Imamura, Takuma Kano, Susumu Yamada, Masahiko Okumura, Masahiko Machida
Grids. Int. J. High Perform. Comput. Appl. 24 (3) (2010)
Toshiyuki Imamura, Susumu Yamada, Masahiko Machida
Narrow-band reduction approach of a DRSM eigensolver on a multicore-based cluster system. PARCO (2009)
Toshiyuki Imamura
Recursive multi-factoring algorithm for MPI allreduce. Parallel and Distributed Computing and Networks (2007)
Susumu Yamada, Toshiyuki Imamura, Takuma Kano, Masahiko Machida
Gordon Bell finalists I - High-performance computing for exact numerical approaches to quantum many-body problems on the earth simulator. SC (2006)
Toshiyuki Imamura, Ken Naono
Automatic Tuning Technique Exploring Within the Hardware-Specific Constrained Parameters. LSSC (2005)
Susumu Yamada, Toshiyuki Imamura, Masahiko Machida
16.14 TFLOPS Eigenvalue Solver on the Earth Simulator: Exact Diagonalization for Ultra Largescale Hamiltonian Matrix. ISHPC (2005)
Ken Naono, Toshiyuki Imamura
An Evaluation Towards Automatically Tuned Eigensolvers. LSSC (2005)
Susumu Yamada, Toshiyuki Imamura, Masahiko Machida
16.447 TFlops and 159-Billion-dimensional Exact-diagonalization for Trapped Fermion-Hubbard Model on the Earth Simulator. SC (2005)
Susumu Yamada, Toshiyuki Imamura, Masahiko Machida
10TFLOPS Eigenvalue Solver for Strongly-Correlated Fermions on the Earth Simulator. Parallel and Distributed Computing and Networks (2005)
Toshiyuki Imamura
C-Stab: Cache Stabilizing Algorithm for a Numerical Library. Parallel and Distributed Computing and Networks (2005)
Yuichi Tsujita, Toshiyuki Imamura, Nobuhiro Yamagishi, Hiroshi Takemiya
MPI-2 Support in Heterogeneous Computing Environment Using an SCore Cluster System. ISPA (2003)
Toshiyuki Imamura, Nobuhiro Yamagishi, Hiroshi Takemiya, Yukihiro Hasegawa, Kenji Higuchi, Norihiro Nakajima
A Visual Resource Integration Environment for Distributed Applications on the ITBL System. ISHPC (2003)
Kenji Higuchi, Toshiyuki Imamura, Yoshio Suzuki, Futoshi Shimizu, Masahiko Machida, Takayuki Otani, Yukihiro Hasegawa, Nobuhiro Yamagishi, Kazuyuki Kimura, Tetsuo Aoyagi, Norihiro Nakajima, Masahiro Fukuda, Genki Yagawa
Grid Computing Supporting System on ITBL Project. ISHPC (2003)
Yuichi Tsujita, Toshiyuki Imamura, Hiroshi Takemiya, Nobuhiro Yamagishi
Stampi-I/O: A Flexible Parallel-I/O Library for Heterogeneous Computing Environment. PVM/MPI (2002)
Toshiyuki Imamura, Yuichi Tsujita, Hiroshi Koide, Hiroshi Takemiya
An Architecture of Stampi: MPI Library on a Cluster of Parallel Computers. PVM/MPI (2000)
Toshiyuki Imamura
An Estimation of Complexity and Computational Costs for Vertical Block-Cyclic Distributed Parallel LU Factorization. J. Supercomput. 15 (1) (2000)