Domain Decomposition

• Procedure calls to solve a subproblem inside a loop

REAL*8 A(N,N)

do i=1,100

call SUB(A,i)

enddo

subroutine sub(A,k)

Compute on a column of A

end

Call

k

A

• Subroutine SUB may be written in dirty F77.

• In HPF, the subroutine might be completely rewritten.

• Usually, required communication can be handled in the caller.

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