Today is the start of ISC09, and as usual, a new Top500 list kicks off the action. IBM’s Roadrunner hangs on to the top slot, with Cray’s XT5 Jaguar still there in second place. SGI‘s Pleiades system at NASA Ames is pushed down to fourth place, as the new Jugene Bluegene/P system enters at number 3.

The full list, with more details on each of the systems, can be found at http://top500.org/lists/2009/06