Organizers responsible for the Top500 supercomputer rankings list confirmed that IBM’s Blue Gene/L supercomputer still holds the number one position on the Top500 chart. Blue/Gene L is a joint collaboration between International Business Machines and Department of Energy’s National Nuclear Security Administration. The supercomputer managed to receive a performance score of 136.8 teraflops per second with Linpack benchmark, which is designed to measure performance of supercomputers for the Top500 competition. The Top500 list is updated every six months with new results.

The organizers, Hans Meur, University of Mannheim, Germany; Erich Strohmaier and Horst Simon, NER C/Lawrence Berkeley National Laboratory; and Jack Dongarra, University of Tennessee, Knoxville, said IBM also had the most systems in the competition at 259. Hewlett Packard, the second placeholder (total number of systems), had 131 systems present.

The second place winner on the performance charts was another Blue Gene system with total Linpack score of 91.2 teraflops per second.

According to the list, 333 supercomputers used Intel microprocessors (up from 320 in the last six months), 77 supercomputers used IBM’s Power PC microprocessors, 26 used HP’s PA RISC chips and 25 systems used AMD’s processors.

Furthermore, 259 supercomputers were based in the United States, 114 in Europe and 58 in various Asian countries.

IBM’s top place supercomputer is currently located in Department of Energy’s Lawrence Livermore National Laboratory in Livermore, California while the second place Blue Gene is situated at IBM’s Thomas J. Watson Research Center in Yorktown, New York.