Basic HTML version of Foils prepared August 7 98

Foil 17 Gaussian Elimination: HPF Program

From DoD HPF Training -- 5. Parallel Programming in HPF DoD Training and Others -- 1995-98. by Chuck Koelbel -- Rice University
1 REAL a(n,n), tmp(n)
2 !HPF$ DISTRIBUTE a(CYCLIC,CYCLIC)
3 !HPF$ ALIGN tmp(i) WITH a(*,i)
4 DO k = 1, n-1
  • ! Select the pivot
  • ipivot = MAXLOC( ABS(a(k:n,k)) ) + k - 1
  • ! Swap the rows
  • tmp(k:n) = a(ipivot,k:n)
  • a(ipivot,k:n) = a(k,k:n)
  • a(k,k:n) = tmp(k:n)
  • ! Update the submatrix
  • FORALL ( i=k+1:n, j=k+1:n ) &
    • & a(i,j) = a(i,j) - a(i,k)/tmp(k)*tmp(j)
5 END DO
in Table To:

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