The Journal of Supercomputing is an archival technical journal publishing theoretical practical tutorial and survey papers on all aspects of supercomputing. The papers published generally fall into areas such as technology architecture and systems algorithms languages and programs performance measures and methods and applications. The tutorial and survey papers are intended for workers and students in the fields associated with and employing advanced computer systems. Letters to the Editor are also published especially in areas relating to policy succinct statements of paradoxes intuitively puzzling results partial results and real needs. The theoretical and practical papers in specific areas are advanced in-depth treatments describing new developments and new ideas. Each such paper contains an introduction summarizing prior directly pertinent work that is useful for the reader to understand in order to appreciate the advances being described.