Microsoft says a Windows-based supercomputer has broken the petaflop speed barrier, but the achievement isn't being recognized by the group that tracks the world's fastest supercomputers, because the same machine was able to achieve higher speeds using Linux. It's an interesting story that demonstrates Microsoft's improving ability to run high-performance applications, while also giving Linux fans reason to smile.
In the latest ranking, a new supercomputer installation in China, "the Tianjin National Supercomputer Center's Tianhe-1A system benchmarked a performance of 2.67 petaflops (quadrillion floating-point calculations per second), surpassing the former top achiever, the U.S. Department of Energy (DOE) Oak Ridge Leadership Computing Facility's Cray XT5 Jaguar system, which clocked in at 1.75 petaflops in this round."
News of the Chinese system's performance emerged in late October. As a result, the former number one system -- the Cray XT5 "Jaguar" system at the DOE Oak Ridge Leadership Computing Facility in Tennessee -- is now ranked in 2nd place. Jaguar achieved 1.75 petaflop/s running Linpack, the TOP500 benchmark application.
More Info: Top 500 Supercomputers