Sycl Academy LogoSycl Academy Logo
listShow Lessons List
  1. What is SYCL
  2. Enqueueing a Kernel
  3. Managing Data
  4. Handling Errors
  5. Device Discovery
  6. Data Parallelism
  7. Introduction to USM
  8. Using USM
  9. Asynchronous Execution
  10. Data and Dependencies
  11. In Order Queue
  12. Advanced Data Flow
  13. Multiple Devices
  14. ND Range Kernels
  15. Image Convolution
  16. Coalesced Global Memory
  17. Vectors
  18. Local Memory Tiling
  19. Further Optimisations
  20. Matrix Transpose
  21. More SYCL Features
  22. Functors
Lesson
Source
Solution
GitHub Iconedit

Advanced Data Flow

In this exercise you will learn how to use temporary data and avoid unnecessary copies to and from the device.

1.) Temporary data with buffer/accessor model

Using what you've learnt so far write a SYCL application that has two kernels, where the first kernel reads in from an input and writes to an intermediate data and the second reads that intermediate data and writes to an output.

Feel free to have the kernel functions perform any computation you like, and feel free to use any method of synchronization and copy back you like.

To ensure the input buffer doesn't copy back to the original pointer call set_final_data on it with nullptr.

To ensure the intermediate buffer doesn't copy to or from the device, create it as uninitialized.

To ensure the output buffer is copied back create is as uninitialized and then call set_final_data on it with the address of the output memory.

2.) Temporary data with USM model

Now do the same but using the USM model.

Again, feel free to have the kernel functions perform any computation you like, and feel free to use any method of synchronization and copy back you like.

Note that when using the USM model since it's an explicit model to avoid unnecessary copies you can simply not perform those copies.

Build and execution hints

For DevCloud via JupiterLab follow these instructions.

For DPC++: instructions.

For AdaptiveCpp: instructions.