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The “omp sections” Directive
Clauses Supported: “sections” Directive |
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Private(list)
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Lastprivate(list)
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Firstprivate(list)
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Reduction(operator:list)
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Nowait
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Questions |
| What happens if the number of threads and the number of sections are different? More threads than sections? |
Example 1
A Parallel Section Example |
#pragma omp parallel shared(n,a,b,c,d) private(i)
{
#pragma omp sections nowait
{
#pragma omp section
for (i = 0; i < n-1; i++)
b[i] = (a[i] + a[i+1])/2;
#pragma omp section
for (i = 0; i < n; i++)
d[i] = 1.0/c[i];
} /*– End of sections –*/
} /*– End of parallel region –*/ |
- By default, there is a barrier at the end of the “omp sections”. Use of “nowait” clause turns off the barrier
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