Basic HTML version of Foils prepared 14 October 1997

Foil 40 Data Parallel Pipeline Algorithm Grav -- Part I

From Fox Presentation Fall 1995 CPS615 Basic Simulation Track for Computational Science -- Fall Semester 95/96/97. by Nancy McCracken and Geoffrey C. Fox
function Grav(X,M)
C accepts positions of particles X and masses of particles M
C returns accelerations in Grav
  • integer, parameter :: N =number of particles
  • real, parameter :: G = gravitational constant
  • real, dimension (1:3, 1:N) :: X,M,Grav
  • real, dimension (1:3,1:N) :: A, Xc, Mc, Ac, D, R
  • integer k
! A is fixed accelerations - X and M are used for fixed positions and masses
  • A=0.0
  • Ac=0.0 ! circulating accelerations
  • Xc=X ! circulating positions
  • M=G*M ! precalculate mass * gravitational constant
  • Mc=M ! circulating masses

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