In this exercise, you must implement an interop_task to let a SYCL application call cuBLAS . This application will perform a vector/matrix multiplication using the cublasSgemv routine in cuBLAS . A CUDA version of the application is provided, demonstrating how to call cublasSgemv .

These instructions assume that example docker image is being used. This image simplifies accessing these examples as the environment is set up correctly. For details on how to get started with the example docker image, refer to the root README file.

Requires CMake 3.17 to configure (makes use of FindCUDAToolkit for simplicity) This exercise must be compiled and executed with the DPC++ compiler. It is expected that you have read at least example-02 before attempting this exercise.

$ mkdir build && cd build
$ cmake ../ -DSYCL_ROOT=${SYCL_ROOT_DIR} -DCMAKE_CXX_COMPILER=${SYCL_ROOT_DIR}/bin/clang++
$ make -j 8

Two source codes are provided. sgemv.cu is the original CUDA code calling CUBLAS library to perform the vector/matrix multiplication. sycl_sgemv.cpp is the unfinished SYCL variant that you must complete. Running the sycl_sgemv.cpp executable at this stage will result in a runtime error.

Both implementations set up the same input data and expect the same output.

Familiarise yourself with the host_task by reading through the SYCL source in example-02.