Data Clauses in OpenACC¶

1. Which OpenACC clause allocates memory on the device, copies data from the host at the start, and then back to the host upon exiting the region?

• A. copyin
• B. copyout
• C. copy
• D. present

Main Data Clauses¶

2. True or False: The create clause in OpenACC allocates memory on the device without any data transfer from the host.

3. Which clause would you use if the data is already allocated on the device from a parent data region, avoiding redundant allocation and transfer?

• A. copyout
• B. create
• C. deviceptr
• D. present

4. In OpenACC, the deviceptr clause is mainly used for which of the following?

• A. Device pointers allocated outside OpenACC
• B. Allocating memory for host-only variables
• C. Handling nested loops
• D. Caching frequently accessed data

Structured vs. Unstructured Data Regions¶

5. True or False: An unstructured data region in OpenACC allows data to remain on the device across multiple functions until it is explicitly deallocated.

Cache Clause¶

6. What is the primary purpose of the cache clause in OpenACC?

• A. To allocate memory on the GPU without transferring data
• B. To keep frequently accessed data on the device for faster access
• C. To assume data is already on the device
• D. To combine multiple nested loops