In large scale computational mechanics system, huge data are transmitted among many modules such as mesh generators, domain decomposers, parallel solvers, visualizers, and optimization modules. If the domain decomposition techniques are used in the parallel solvers, the huge mesh data created by the mesh generator, and various attributes attached on the mesh have to be subdivided into subdomain data by the domain decomposer. The data are huge, flows of the data are complicated, and various kinds of data are handled. Therefore, the input/output (I/O) data formats used in the conventional general-purpose finite element codes are not suitable for the system. A new I/O data format system is presented in this paper, which can efficiently handle the various huge data in the large scale parallel computations.
