Actually 10-petaflop barrier (LINPACK benchmark) was surpassed in November by Japanese K-computer:
http://www.riken.jp/engn/r-world/info/release/press/2011/111...
http://www.riken.jp/engn/r-world/info/release/press/2011/111...
> To reach 10 petaflops, which is just marginally slower than the world’s fastest HPC installation, Japan’s K computer,