As of November 2021, the top 10 fastest supercomputers in the world are:

1. Fugaku (Japan) – Located at the RIKEN Center for Computational Science, this supercomputer tops the list with a speed of 442.0 petaflops.

2. Summit (United States) – Housed at Oak Ridge National Laboratory, Summit reaches a speed of 148.8 petaflops.

3. Sierra (United States) – Located at Lawrence Livermore National Laboratory, Sierra has a speed of 94.6 petaflops.

4. Selene (United States) – Housed at NVIDIA Corporation, Selene reaches a speed of 63.4 petaflops.

5. Frontera (United States) – Located at the Texas Advanced Computing Center, Frontera has a speed of 23.5 petaflops.

6. TaihuLight (China) – Located at the National Supercomputing Center in Wuxi, TaihuLight reaches a speed of 18.4 petaflops.

7. Tianhe-2A (China) – Housed at the National Supercomputer Center in Guangzhou, Tianhe-2A has a speed of 13.8 petaflops.

8. HPC-AI Consortium’s Lassen (United States) – Located at Lawrence Livermore National Laboratory, Lassen reaches a speed of 10.0 petaflops.

9. Piz Daint (Switzerland) – Housed at the Swiss National Supercomputing Centre, Piz Daint has a speed of 9.8 petaflops.

10. Marconi-100 (Italy) – Located at the CINECA Supercomputing Center, Marconi-100 reaches a speed of 8.8 petaflops.

Please note that rankings can change as new supercomputers are developed and older ones are upgraded.