Takeshi Iwashita

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We discuss a scheme for hierarchical matrices with adaptive cross approximation on symmetric multipro-cessing clusters. We propose a set of parallel algorithms that are applicable to hierarchical matrices. The proposed algorithms are implemented using the flat-MPI and hybrid MPI+OpenMP programming models. The performance of these implementations is(More)
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This paper introduces an automatic tuning method for the tiling parameters required in an implementation of the three-dimensional FDTD method based on time-space tiling. In this tuning process, an appropriate range for the tile size is first determined by trial experiments using cubic tiles. The tile shape is then optimized by using the Monte Carlo method.(More)
Slowdown and inevitable end in exponential scaling of processor performance, the end of the so-called "Moore's Law" is predicted to occur around 2025--2030 timeframe. Because CMOS semiconductor voltage is also approaching its limits, this means that <i>logic transistor power will become constant</i>, and as a result, the system FLOPS will cease to improve,(More)