Using the following code, answer the following questions

1. #pragma omp parallel
2.{
3. id-omp-get thread num();
4. numThreads- omp_get num threads0
5, printf("Hello from thread %d of %din", id, numThreads);
6.}

a. What is the output of the above program in PI 3 B+? .
b. What does the statement at line 1 mean?
c. How to compile the following code (executable should not be /a out)?
d. What does the statement at line 4 (after the equal sign) mean?

Answer explained

Explanation:

as PI 3 B+ is quadcore processor(i.e. 4 cores)

omp_get_thread_num() is used for getting thread number.(i.e. 0,1,2,3)

omp_get_num_threads() is used for getting number of threads.(i.e. 4)

1. Output should be,

Hello from thread 0 of 4

Hello from thread 1 of 4

Hello from thread 2 of 4

Hello from thread 3 of 4

2. #pragma omp parallel is used to fork(create child) additional threads to carry out the work enclosed in the construct in parallel.

3. We can Compile this code using,

  gcc -o omp_helloc -fopenmp hello.c

4. We can Run this code using,

   ./hello

5.omp_get_num_threads() is used for getting number of threads.(i.e. 4)

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i guess the correct option is letter a.

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