McqMate
Chapters
| 1. |
Which directive must precede the directive: #pragma omp sections (not necessarily immediately)? |
| A. | #pragma omp section |
| B. | #pragma omp parallel |
| C. | None |
| D. | #pragma omp master |
| Answer» A. #pragma omp section | |
| 2. |
When compiling an OpenMP program with gcc, what flag must be included? |
| A. | -fopenmp |
| B. | #pragma omp parallel |
| C. | –o hello |
| D. | ./openmp |
| Answer» A. -fopenmp | |
| 3. |
Within a parallel region, declared variables are by default ________ . |
| A. | Private |
| B. | Local |
| C. | Loco |
| D. | Shared |
| Answer» D. Shared | |
| 4. |
A ______________ construct by itself creates a “single program multiple data” program, i.e., each thread executes the same code. |
| A. | Parallel |
| B. | Section |
| C. | Single |
| D. | Master |
| Answer» A. Parallel | |
| 5. |
_______________ specifies that the iteration of the loop must be executed as they would be in serial program. |
| A. | Nowait |
| B. | Ordered |
| C. | Collapse |
| D. | for loops |
| Answer» B. Ordered | |
| 6. |
___________________ initializes each private copy with the corresponding value from the master thread. |
| A. | Firstprivate |
| B. | lastprivate |
| C. | nowait |
| D. | Private (OpenMP) and reduction. |
| Answer» A. Firstprivate | |
| 7. |
The __________________ of a parallel region extends the lexical extent by the code of functions that are called (directly or indirectly) from within the parallel region. |
| A. | Lexical extent |
| B. | Static extent |
| C. | Dynamic extent |
| D. | None of the above |
| Answer» C. Dynamic extent | |
| 8. |
The ______________ specifies that the iterations of the for loop should be executed in parallel by multiple threads. |
| A. | Sections construct |
| B. | for pragma |
| C. | Single construct |
| D. | Parallel for construct |
| Answer» B. for pragma | |
| 9. |
_______________ Function returns the number of threads that are currently active in the parallel section region. |
| A. | omp_get_num_procs ( ) |
| B. | omp_get_num_threads ( ) |
| C. | omp_get_thread_num ( ) |
| D. | omp_set_num_threads ( ) |
| Answer» B. omp_get_num_threads ( ) | |
| 10. |
The size of the initial chunksize _____________. |
| A. | total_no_of_iterations / max_threads |
| B. | total_no_of_remaining_iterations / max_threads |
| C. | total_no_of_iterations / No_threads |
| D. | total_no_of_remaining_iterations / No_threads |
| Answer» A. total_no_of_iterations / max_threads | |
| 11. |
A ____________ in OpenMP is just some text that modifies a directive. |
| A. | data environment |
| B. | clause |
| C. | task |
| D. | Master thread |
| Answer» B. clause | |
| 12. |
In OpenMP, the collection of threads executing the parallel block the original thread and the new thread is called a ____________ |
| A. | team |
| B. | executable code |
| C. | implicit task |
| D. | parallel constructs |
| Answer» A. team | |
| 13. |
When a thread reaches a _____________ directive, it creates a team of threads and becomes the master of the team. |
| A. | Synchronization |
| B. | Parallel |
| C. | Critical |
| D. | Single |
| Answer» B. Parallel | |
| 14. |
Use the _________ library function to determine if nested parallel regions are enabled. |
| A. | Omp_target() |
| B. | Omp_declare target() |
| C. | Omp_target data() |
| D. | omp_get_nested() |
| Answer» D. omp_get_nested() | |
| 15. |
The ____________ directive ensures that a specific memory location is updated atomically, rather than exposing it to the possibility of multiple, simultaneous writing threads. |
| A. | Parallel |
| B. | For |
| C. | atomic |
| D. | Sections |
| Answer» C. atomic | |
| 16. |
A ___________ construct must be enclosed within a parallel region in order for the directive to execute in parallel. |
| A. | Parallel sections |
| B. | Critical |
| C. | Single |
| D. | work-sharing |
| Answer» D. work-sharing | |
| 17. |
____________ is a form of parallelization across multiple processors in parallel computing environments. |
| A. | Work-Sharing Constructs |
| B. | Data parallelism |
| C. | Functional Parallelism |
| D. | Handling loops |
| Answer» B. Data parallelism | |
| 18. |
In OpenMP, assigning iterations to threads is called ________________ |
| A. | scheduling |
| B. | Static |
| C. | Dynamic |
| D. | Guided |
| Answer» A. scheduling | |
| 19. |
The ____________is implemented more efficiently than a general parallel region containing possibly several loops. |
| A. | Sections |
| B. | Parallel Do/For |
| C. | Parallel sections |
| D. | Critical |
| Answer» B. Parallel Do/For | |
| 20. |
_______________ causes no synchronization overhead and can maintain data locality when data fits in cache. |
| A. | Guided |
| B. | Auto |
| C. | Runtime |
| D. | Static |
| Answer» D. Static | |
| 21. |
How does the difference between the logical view and the reality of parallel architectures affect parallelization? |
| A. | Performance |
| B. | Latency |
| C. | Bandwidth |
| D. | Accuracy |
| Answer» A. Performance | |
| 22. |
How many assembly instructions does the following C instruction take? global_count += 5; |
| A. | 4 instructions |
| B. | 3 instructions |
| C. | 5 instructions |
| D. | 2 instructions |
| Answer» A. 4 instructions | |
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