Fugaku was created by research group Riken and technology company Fujitsu, using technology from Arm, which makes semiconductors and software. Arm designs chips for many of the world's smartphones, including the iPhone, and is rumoured to be coming to Apple's Macs as well.
No supercomputer has ever scored at the top of the three rankings – known as Top500, HPCG, and Graph500 – before, the creators said.
In the Top500 ranking, it achieved a score of 415.53 petaflops. That is compared with the 148.6 petaflop score achieved by its nearest competitor, Summit, which is based in the US and is based on IBM hardware.
At the moment, Fugaku is doing experimental work on Covid-19, including simulating how the virus spreads. Many supercomputers around the world are being put to work on the coronavirus outbreak, allowing researchers to better understand the new virus and how to fight the pandemic.
Aside from that work, Japan hopes to use the computer for its "Society 5.0" technology programme. That could see it used for everything from simulating nuclear blasts to modelling climate change.
"I very much hope that Fugaku will show itself to be highly effective in real-world applications and will help to realize Society 5.0," said Naoki Shinjo, corporate executive officer of Fujitsu, in a statement.
Fugaku was created by research group Riken and technology company Fujitsu, using technology from Arm, which makes semiconductors and software. Arm designs chips for many of the world's smartphones, including the iPhone, and is rumoured to be coming to Apple's Macs as well.