[Openmp-dev] OpenMP ordered clause for nested loops

[Himanshu Shukla via Openmp-dev]

Hi ,

I am trying to write an OpenMP code. When I execute this code, from the
output it is clear that only outer dimension is parallelized.


*#pragma omp parallel for schedule(static) ordered(1)*
* for (int j = 1; j < N; j++)*
* {*
*    for (int i = 1; i < N; i++)*
*    {*

*      printf("Iteration j=%d,i=%d, Thread %d\n", j, i,
omp_get_thread_num());*

*    }*
* }*

But when I execute the following code both the dimensions are parallelized.
Why ? As per my understanding , the *#pragma omp parallel for *directive
should only parallelize the outermost dimension and the inner dimension
should run sequentially. Why is ordered clause parameter affecting it ?

*#pragma omp parallel for schedule(static) ordered(1)*
* for (int j = 1; j < N; j++)*
* {*
*    for (int i = 1; i < N; i++)*
*    {*

*      printf("Iteration j=%d,i=%d, Thread %d\n", j, i,
omp_get_thread_num());*

*    }*


* }*
Please advise .
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