This paper introduces the use of the Fugaku and HPCI supercomputer systems. The HPCI project includes Fugaku installed at RIKEN and other supercomputer systems at 14 research institutions. They are basically available free of charge. There are two types of calls for proposals, one is regular calls to be done once or twice a year (the second call is applicable to Fugaku only), and the other is calls opening throughout the year. The calls opening throughout the year include both trial access proposals and Fee-based access proposals for highly confidential projects. Fugaku trial access includes first-touch option (1000NH. 3months) available with easy application for use. Several types of user support are available for the use of these supercomputer systems. For example, “Program Tuning support” provides supports for application porting, serial and scalability optimization. “Accompanying support” for industrial use is available when it is difficult for the company to solve the problem by itself. Pre-installed software for Fugaku is available by spack, and please check for the latest information as it is updated from time to time. For more information, please visit https://www.hpci-office.jp/ .
