Affiliations: Barcelona Supercomputing Center – Centro Nacional de Supercomputación, Barcelona, Spain | Computer Architecture Department, Universitat Politècnica de Catalunya, Barcelona, Spain | Universidad de Antioquia, Medellín, Colombia | Consejo Superior de Investigaciones Científicas, Madrid, Spain
Note: [] Corresponding author: Rosa M. Badia, Barcelona Supercomputing Center – Centro Nacional de Supercomputación, Building Nexus II, Jordi Girona 29, 08034 Barcelona, Spain. Tel.: +34 934034075; Fax: +34 934037721; E-mail: [email protected].
Abstract: Cell Superscalar's (CellSs) main goal is to provide a simple, flexible and easy programming approach for the Cell Broadband Engine (Cell/B.E.) that automatically exploits the inherent concurrency of the applications at a task level. The CellSs environment is based on a source-to-source compiler that translates annotated C or Fortran code and a runtime library tailored for the Cell/B.E. that takes care of the concurrent execution of the application. The first efforts for task scheduling in CellSs derived from very simple heuristics. This paper presents new scheduling techniques that have been developed for CellSs for the purpose of improving an application's performance. Additionally, the design of a new scheduling algorithm is detailed and the algorithm evaluated. The CellSs scheduler takes an extension of the memory hierarchy for Cell/B.E. into account, with a cache memory shared between the SPEs. All new scheduling practices have been evaluated showing better behavior of our system.
