I didn't know what it was, I don't follow supercomputing very closely. I looked it up. From http://en.wikipedia.org/wiki/Exascale_computing [wikipedia.org]
"Exascale computing refers to computing capabilities beyond the currently existing petascale. If achieved, it would represent a thousandfold increase over that scale."
To define Petascale:
"In computing, petascale refers to a computer system capable of reaching performance in excess of one petaflops, i.e. one quadrillion floating point operations per second." http://en.wikipedia.org/wiki/Petascale [wikipedia.org]
A Petascale computer, the Cray XT5 Jaguar can do 1.75 petaflops. To reach an exaflop, it would require almost 6000 installations of this supercomputer.
So yeah, Exaflop is pretty big. http://en.wikipedia.org/wiki/Orders_of_magnitude_(computing) [wikipedia.org]
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