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IconShow 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. Image Convolution
  15. Coalesced Global Memory
  16. Vectors
  17. Local Memory Tiling
  18. Further Optimisations
  19. Matrix Transpose
  20. More SYCL Features
  21. Functors
Lesson
Source
Solution
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Vectors

In this exercise you will learn how to cache global memory into local memory in tiles according to work-groups in order to compare the performance difference.

1.) Use local memory

Allocate local memory for the kernel function by creating a local accessor.

The local accessor is created by specifying a range which is the number of elements to allocate.

Note that local memory is allocated per work-group and each work-group can only access it's own local memory.

2.) Cache global memory access in local memory

Cache the global memory required for each work-group in local memory by reading from global accessor and then writing to the local accessor.

Remember to use the local id to know where in local memory to store the data, this can be queried by calling the nd_item member function get_local_id.

Compare the performance with local memory and without local memory.

Build and execution hints

For DevCloud via JupiterLab follow these instructions.

For DPC++: instructions.

For AdaptiveCpp: instructions.