China expands its share of fastest supercomputers although US remains No 1 when it comes to speed

The US retained its top position as the country with the fastest supercomputers in the world but China extended its dominance in overall system numbers, according to the latest ranking of the Top500 fastest supercomputers published Monday.

Summit and Sierra, two IBM-built supercomputers, maintained their top positions for the US, closely followed by China's Sunway TaihuLight supercomputer and Tianhe-2A, said the semi-annual list, which saw the top 10 systems unchanged from the previous ranking published in June.

The number of Top500 systems installed in China reached 227, up from 219 six months ago. Meanwhile, the number of US-based systems remains near its all-time low at 118.

The rising number of Top500 installations in China has contributed to a shrinking gap in aggregate performances between US-made and China-made supercomputers. US systems, which are on average much more powerful, held a 37.8 per cent share of the list’s aggregate performance while China was close behind with a 31.9 per cent performance share. The June 2019 list had the US with a 38.4 per cent aggregate performance share compared to China‘s 29.9 per cent.