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SYCL Academy

Exercise 18: Local Memory Tiling

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, you can do this by creating an accessor with the access::target::local access target template parameter.

The local accessor is create 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

ComputeCpp

cmake -DSYCL_ACADEMY_USE_COMPUTECPP=ON -DSYCL_IMPLEMENTATION_INSTALL_ROOT=/insert/path/to/computecpp ..
make exercise_18_local_memory_tiling_source
./Code_Exercises/Exercise_18_Local_Memory_Tiling/exercise_18_local_memory_tiling_source

DPC++

clang++ -fsycl -I../../External/Catch2/single_include -I../../Utilities/include/ -I../../External/stb solution.cpp