McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Programming Languages .
Chapters
| 1. |
MPI specifies the functionality of _________________ communication routines. |
| A. | High-level |
| B. | Low-level |
| C. | Intermediate-level |
| D. | Expert-level |
| Answer» A. High-level | |
| 2. |
_________________ generate log files of MPI calls. |
| A. | mpicxx |
| B. | mpilog |
| C. | mpitrace |
| D. | mpianim |
| Answer» B. mpilog | |
| 3. |
A collective communication in which data belonging to a single process is sent to all of the processes in the communicator is called a ________________. |
| A. | Scatter |
| B. | Gather |
| C. | Broadcast |
| D. | Allgather |
| Answer» C. Broadcast | |
| 4. |
__________________ is a nonnegative integer that the destination can use to selectively screen messages. |
| A. | Dest |
| B. | Type |
| C. | Address |
| D. | length |
| Answer» B. Type | |
| 5. |
The routine ________________ combines data from all processes by adding them in this case and returning the result to a single process. |
| A. | MPI _ Reduce |
| B. | MPI_ Bcast |
| C. | MPI_ Finalize |
| D. | MPI_ Comm size |
| Answer» A. MPI _ Reduce | |
| 6. |
The easiest way to create communicators with new groups is with_____________. |
| A. | MPI_Comm_rank |
| B. | MPI_Comm_create |
| C. | MPI_Comm_Split |
| D. | MPI_Comm_group |
| Answer» C. MPI_Comm_Split | |
| 7. |
_______________ is an object that holds information about the received message, including, for example, it’s actually count. |
| A. | buff |
| B. | count |
| C. | tag |
| D. | status |
| Answer» D. status | |
| 8. |
The _______________ operation similarly computes an element-wise reduction of vectors, but this time leaves the result scattered among the processes. |
| A. | Reduce-scatter |
| B. | Reduce (to-one) |
| C. | Allreduce |
| D. | None of the above |
| Answer» A. Reduce-scatter | |
| 9. |
__________________is the principal alternative to shared memory parallel programming. |
| A. | Multiple passing |
| B. | Message passing |
| C. | Message programming |
| D. | None of the above |
| Answer» B. Message passing | |
| 10. |
________________may complete even if less than count elements have been received. |
| A. | MPI_Recv |
| B. | MPI_Send |
| C. | MPI_Get_count |
| D. | MPI_Any_Source |
| Answer» A. MPI_Recv | |
| 11. |
A ___________ is a script whose main purpose is to run some program. In this case, the program is the C compiler. |
| A. | wrapper script |
| B. | communication functions |
| C. | wrapper simplifies |
| D. | type definitions |
| Answer» A. wrapper script | |
| 12. |
________________ returns in its second argument the number of processes in the communicator. |
| A. | MPI_Init |
| B. | MPI_Comm_size |
| C. | MPI_Finalize |
| D. | MPI_Comm_rank |
| Answer» B. MPI_Comm_size | |
| 13. |
_____________ always blocks until a matching message has been received. |
| A. | MPI_TAG |
| B. | MPI_ SOURCE |
| C. | MPI Recv |
| D. | MPI_ERROR |
| Answer» C. MPI Recv | |
| 14. |
Communication functions that involve all the processes in a communicator are called ___________ |
| A. | MPI_Get_count |
| B. | collective communications |
| C. | buffer the message |
| D. | nonovertaking |
| Answer» B. collective communications | |
| 15. |
MPI_Send and MPI_Recv are called _____________ communications. |
| A. | Collective Communication |
| B. | Tree-Structured Communication |
| C. | point-to-point |
| D. | Collective Computation |
| Answer» C. point-to-point | |
| 16. |
The processes exchange partial results instead of using oneway communications. Such a communication pattern is sometimes called a ___________. |
| A. | butterfly |
| B. | broadcast |
| C. | Data Movement |
| D. | Synchronization |
| Answer» A. butterfly | |
| 17. |
A collective communication in which data belonging to a single process is sent to all of the processes in the communicator is called a _________. |
| A. | broadcast |
| B. | reductions |
| C. | Scatter |
| D. | Gather |
| Answer» A. broadcast | |
| 18. |
In MPI, a ______________ can be used to represent any collection of data items in memory by storing both the types of the items and their relative locations in memory. |
| A. | Allgather |
| B. | derived datatype |
| C. | displacement |
| D. | beginning |
| Answer» B. derived datatype | |
| 19. |
MPI provides a function, ____________ that returns the number of seconds that have elapsed since some time in the past. |
| A. | MPI_Wtime |
| B. | MPI_Barrier |
| C. | MPI_Scatter |
| D. | MPI_Comm |
| Answer» A. MPI_Wtime | |
| 20. |
Programs that can maintain a constant efficiency without increasing the problem size are sometimes said to be _______________. |
| A. | weakly scalable |
| B. | strongly scalable |
| C. | send_buf |
| D. | recv_buf |
| Answer» B. strongly scalable | |
| 21. |
Parallelism can be used to increase the (parallel) size of the problem is applicable in ___________________. |
| A. | Amdahl's Law |
| B. | Gustafson-Barsis's Law |
| C. | Newton's Law |
| D. | Pascal's Law |
| Answer» B. Gustafson-Barsis's Law | |
| 22. |
Synchronization is one of the common issues in parallel programming. The issues related to synchronization include the followings, EXCEPT: |
| A. | Deadlock |
| B. | Livelock |
| C. | Fairness |
| D. | Correctness |
| Answer» D. Correctness | |
| 23. |
Considering to use weak or strong scaling is part of ______________ in addressing the challenges of distributed memory programming. |
| A. | Splitting the problem |
| B. | Speeding up computations |
| C. | Speeding up communication |
| D. | Speeding up hardware |
| Answer» B. Speeding up computations | |
| 24. |
Which of the followings is the BEST description of Message Passing Interface (MPI)? |
| A. | A specification of a shared memory library |
| B. | MPI uses objects called communicators and groups to define which collection of processes may communicate with each other |
| C. | Only communicators and not groups are accessible to the programmer only by a "handle" |
| D. | A communicator is an ordered set of processes |
| Answer» B. MPI uses objects called communicators and groups to define which collection of processes may communicate with each other | |
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