"Lawrence Livermore and Rensselaer Polytechnic Institute scientists set a new simulation speed record on the Sequoia supercomputer

Constructed by IBM, the 120 rack Sequoia supercomputer has a peak performance of 25 petaflops and is the second fastest supercomputer in the world, with a total speed and capacity equivalent to about one million desktop PCs. A petaflop is a quadrillion floating point operations per second.

In addition to breaking the record for computing speed, the research team set a record for the most highly parallel "discrete event simulation," with 7.86 million simultaneous tasks using 1.97 million cores. Discrete event simulations are used to model irregular systems with behavior that cannot be described by equations, such as communication networks, traffic flows, economic and ecological models, military combat scenarios, and many other complex systems."
https://www.llnl.gov/news/newsreleases/2013/Apr/NR-13-04-06.html