Supercomputer Fugaku
Succeeding supercomputer K, Fugaku aims to contribute to Japan's growth and produce world-leading results by solving social and scientific issues in the 2020s. Under the flagship 2020 project of the Ministry of Education, Culture, Sports, Science and Technology (the development of post-K) initiated in fiscal 2014, RIKEN Computational Science and Research Center has developed Fugaku which is planned to start public service in fiscal 2021 (starting in April 2021).
 Conjugate gradient method
When a physical phenomenon is simulated by a computer, it is often solved as a large-scale system of linear equations. There are two methods for solving a system of linear equations: a direct method for directly obtaining a solution, and an iterative method for converging to a correct solution through iterative calculation. The conjugate gradient method is one of the iterative methods, and by combining the preprocessing, the correct solution can be converged quickly. It is often used in the world of computer simulation.
 Society 5.0
As first introduced in the Fifth Science and Technology Basic Plan, this is a proposal for "a human-centered society that achieves both economic development and the resolution of social issues through a highly integrated system of cyberspace (virtual space) and physical space (real space)," indicating the future society that Japan should aim for.
The smallest unit of supercomputer’s computing resource that an operating system can run. One node of Fugaku consists of 1 CPU (central processing unit) and 32 GiB of memory.
 LU decomposition
A method of solving a system of linear equations. This method is called the LU decomposition method because the matrix is decomposed into the product of the lower triangular matrix (Lower-triangular matrix) and the upper triangular matrix (Upper Triangular Matrix) in the middle of the solution.
 Iterative improvement
An approximate solution of a system of linear equations by methods such as LU decomposition contains errors with the true solution. This is a method of solving a system of linear equations (using the errors) again and obtaining a solution closer to the true solution by correcting the approximate solution.
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This is a Fujitsu translation of a Japanese press release issued by RIKEN and Fujitsu Limited.
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Date: 22 June, 2020
Company: Fujitsu Limited