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No. 5: Juqueen (Germany)
After a recent upgrade, Juqueen became Europe's top supercomputer. The 5 petaflop system, housed at the Forschungszentrum Juelich in Germany, is used for open scientific research.
There are 23 systems with petaflop speeds on the latest list -- five years ago, there were none. Roadrunner, the world's first petaflop supercomputer, debuted in June 2008.
The United Kingdom, France and Germany each have about 20 supercomputers on the list.
- Last updated November 12 2012 09:31 AM ET
