エルミート積分法による重力多体問題専用計算機HARP-1  [in Japanese] HARP - 1 : A Special - Purpose Computer for N - body Simulation with the Hermite Integrator  [in Japanese]

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Author(s)

    • 牧野 淳一郎 Makino Junichiro
    • 東京大学教養学部情報図形科学教室 Department of Information Science and Graphics, College of Arts and Sciences, University of Tokyo
    • 泰地 真弘人 Taiji Makoto
    • 東京大学教養学部宇宙地球科学教室 Department of Earth Science and Astronomy, College of Arts and Sciences, University of Tokyo

Abstract

エルミート積分法による重力多体問題専用計算機HARP?1を開発した。エルミート積分法は高精度でかつ一段階法の簡明さをもつ積分法である。エルミート積分法では粒子を時間積分していくさいに粒子の加速度に加えてその時間微分も必要になる。HARP?1はエルミート積分法の中でもっとも計算量の多い粒子の加速度とその時間微分の計算をパイプラインで高速に行なう。HARP?1のパイプラインは24段であり、3クロックごとに1つの粒子間の相互作用を計算する。すなわち、系全体の粒子数をNとすると、1つの粒子の加速度とその時間微分は3N+24クロック後に得られる。HARP?1のピーク演算速度は160Mflopsである。We have designed and built HARP (Hermite Accelerator Pipeline)-1, a special-purpose computer for solving astronomical N-body problems with a high accuracy using the Hermite integrator. The Hermite integrator uses analytically calculated time-derivatives of the acceleration, in addition to the acceleration, to integrate orbits of particles. HARP-1 has a 24-stage pipeline to perform the calculation of the acceleration and its time derivative, which is the most expensive part of the Hermite scheme. The pipeline calculates one gravitational interaction at every three clock cycles. Thus, the acceleration and its time derivative of a particle are calculated in 3N+24 clock cycles, where N is the number of particles. The peek speed of HARP-1 is 160Mflops.

We have designed and built HARP (Hermite Accelerator Pipeline)-1, a special-purpose computer for solving astronomical N-body problems with a high accuracy using the Hermite integrator. The Hermite integrator uses analytically calculated time-derivatives of the acceleration, in addition to the acceleration, to integrate orbits of particles. HARP-1 has a 24-stage pipeline to perform the calculation of the acceleration and its time derivative, which is the most expensive part of the Hermite scheme. The pipeline calculates one gravitational interaction at every three clock cycles. Thus, the acceleration and its time derivative of a particle are calculated in 3N+24 clock cycles, where N is the number of particles. The peek speed of HARP-1 is 160Mflops.

Journal

  • IPSJ SIG Notes

    IPSJ SIG Notes 1993(72(1993-HPC-048)), 49-56, 1993-08-19

    Information Processing Society of Japan (IPSJ)

Codes

  • NII Article ID (NAID)
    110002932105
  • NII NACSIS-CAT ID (NCID)
    AN10463942
  • Text Lang
    JPN
  • Article Type
    Technical Report
  • Data Source
    NII-ELS  IPSJ 
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