New York Blue Gene supercomputer, also known as NewYorkBlue, is an 18 rack Blue Gene/L and a 2 rack Blue Gene/P massively parallel supercomputer based on the IBM system-on-chip technology. It is located in the New York Center for Computational Sciences (NYCCS). The supercomputer is owned by Stony Brook University and is located at Brookhaven National Laboratory in Upton, Long Island, New York. The funds for this machine were provided by the New York state, with the leadership of the NYS Assembly. It began operating on July 15, 2007, when it was the fifth most powerful supercomputer. The renovation of laboratory space was supported by the New York state and U.S. DOE fund. As of June 2010, the Blue Gene/L was ranked 67th in the Top 500 supercomputing rankings. Together with the Computational Center for Nanotechnology Innovations at Rensselaer Polytechnic Institute, NewYorkBlue provides New York state with more computing power available for general research than any state in the nation. Blue Gene/L machine The Blue Gene/L machine consists of 18432 (18 x 1024) dual-processor Compute Nodes (Blue Gene chip) with each Compute Node having two standard 700 MHz PowerPC440 processors (a total of 36864). The two processors (cores) on a chip share a 1 GB of DDR memory. The 18 racks are arranged in six (6) rows with three (3) racks each making up a 48x24x16 3D torus. The first rack on the first row (row 0) is designated as R00, while the third one on the sixth row (row 5) is R52. In addition to the Compute Nodes, there are dedicated I/O nodes. Each I/O node provides the dedicated hardware that serves the operating system tasks to a group of compute nodes. The I/O node with the compute nodes that it serves make up a group that is referred to a pset. In New York Blue, the pset ratio (the ratio of I/O nodes to compute nodes) can be one of the following: 1:16, 1:32, 1:64 and 1:128. New York Blue is subdivided into partitions (a.k.a. blocks). Each partition has a specific size (number of nodes), type (Mesh or Torus), and pset ratio (one of the ratios mentioned above). Partitions can be predefined or created by users dynamically according to their job needs. The pset ratio varies throughout the machine, having one of the four pset ratios mentioned above. There are 512 compute nodes on a midplane. Blue Gene/P