We have been developing an advanced general-purpose computational mechanics system, named ADVEN-TURE, which is designed to be able to analyze a model of arbitrary shape with a 10 -100 million degrees of freedom (DOFs) mesh, and additionally to enable parametric and nonparametric shape optimization. Domain-decomposition-based parallel algorithms are implemented in pre-processes (domain decomposition), main processes (system matrix assembling and solutions) and post-process (visualization),

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... tively. The hierarchical domain decomposition method with a pre-conditioned iterative solver (HDDM) is adopted in the main processes as one of the major solution techniques. Module-based architecture of the system with standardized I=O format and libraries are also developed and employed to attain exibility, portability, extensibility and maintainability of the whole system. This paper describes some key technologies employed in the system, and shows some latest results including elastic stress analysis of a precise three-dimensional (3D) model of a nuclear reactor vessel with a 60 million DOF mesh on Hitachi SR2201 (1024 PEs), and nonparametric shape optimization of a support structure for an express way with a one million DOF mesh on a PC cluster (10 PEs).