Abstract. Parallel iterative linear solvers for unstructured grids in FEM applications, which were developed for the Earth Simulator (ES), have been ported to various types of parallel computers. Performance of flat-MPI and hybrid parallel programming model has been compared for ES, Hitachi SR8000, IBM SP-3 and IBM p5-model 595. Effect of coloring and method for storage of coefficient matrices have been also evaluated in various types of applications. Performance with more than 10 4 processors has been estimated using measured data up to 10 3 processors.
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