Centers & Labs

RIKEN Center for Computational Science

Application Tuning Development Unit

Unit Leader: Kazuo Minami (Ph.D.)
Kazuo  Minami(Ph.D.)

The application tuning development team work to develop outstanding infrastructure of application development that will take full advantage of the capabilities of the K computer.
In particular, performance evaluation and performance optimization of the applications developed by R-CCS research teams will be carried out.
We establish the performance analysis method and carry out the following tasks in order to optimize the applications.

  1. Analysis of applications information such as performance, function and usage status.
  2. Single CPU performance tuning and high parallelization.
  3. Improvement for efficiency of operational resources by performance optimization of applications.

Our goal is to systematize the technology for performance optimization of applications through these tasks.

Main Research Field


Related Research Fields



  • Parallel processing
  • High performance application
  • Numerical analysis
  • Distributed processing

Selected Publications

  1. K.Minami et al.:
    "Performance Estimation of Programs by an Extension of the RoofLine Model Considering Cache Effects"
    IPSJ Transactions on Advanced Computing System (ACS) Vol.9 No.2, 1–14 (2016)
  2. Akiyoshi Kuroda et al.:
    "Analysis of the Correlation between Application Performance and Power Consumption on the K Computer (in Japanese)"
    IPSJ Transactions on Advanced Computing System (ACS) Vol.8, No.4, 1-12 (2015).
  3. Kiyoshi Kumahata, Kazuo Minami, Naoya Maruyama.:
    "High-performance conjugate gradient performance improvement on the K computer"
    International Journal of High Performance Computing Applications Vol.30, No.1, 55-70 (2016).
  4. Hasegawa, Y., Iwata, J.I., Tsuji, M., Takahashi, D., Oshiyama, A.,Minami, K., Boku, T., Inoue, H., Kitazawa,Y.,Miyoshi, I., Yokokawa,M.:
    "Performance evaluation of ultra-large-scale first-principles electronic structure calculation code on the K computer"
    The International journal of High Performance Computing Applications Vol.28(3), 335-355 (2014)
  5. Y.Hasegawa,K.Minami et al.:
    "First-principles calculations of electron states of a silicon nanowire with 100,000 atoms on the K computer"
    Proc. of 2011 Int. Conf. for High Performance Computing, Networking, Storage and Analysis (SC’11), November 12-18, Seattle, USA, 1-11 (2011)

Lab Members

Principal Investigator

Kazuo Minami
Unit Leader

Core Members

Akiyoshi Kuroda
Research & Development Scientist
Kiyoshi Kumahata
Research & Development Scientist
Kazuto Ando
Technical Staff I

Contact information

7-1-26 Minatojima-minami-machi , Chuo-ku,
Kobe, Hyogo
Tel: +81-(0)78-940-5597

Email: minami_kaz [at]

Related links