Answer to Question #198422 in C for Unknown255319

Question

 float f( float x ) ...

 float area( float xmin, float xmax, int N, float *store )

{

 float h = (xmax-xmin)/N; 9

 // Calculate and store f(x) for each x.

 int i;

 for( i=0; i<N; i++ ) store[i] = f(xmin+i*h);

 // Estimate the area.

 float area = 0.0f;

 for( i=0; i<N; i++ ) area += h * store[i];

 return area;

 }

(a) Consider first the loop at line 12, which calculates f(x) over a range of values of x, and

stores the results in an array store[N].

(i) Identify any data dependencies in this loop. Explain your answer.

(ii) On a shared memory CPU architecture and OpenMP, this loop can be parallelised by using a #pragma omp parallel for directive just before the loop. Provide pseudo- code for the actions performed by each thread in the case that there are p = 3 threads.

Answer 1

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