The example shows how to interop with CUBLAS from a SYCL for CUDA application. The example uses Codeplay's extension interop_task to call the SGEMM routine in CUBLAS. Parameters are extracted using the interop handler conversion.

Requires CMake 3.17 to configure (makes use of FindCUDAToolkit for simplicity) Example is meant to be build and executed with DPC++ compiler.

Create a build directory and run the following command:

CXX=/path/to/dpc++/bin/clang++ cmake build/

If NVIDIA CUDA is installed in your system, CMake should be able to generate the configuration files.

Then run

make

to build the example

Two source codes are provided. sgemm.cu is the original CUDA code calling CUBLAS library to perform the matrix multiplication. sycl_sgemm.cpp is the sycl variant that calls CUBLAS underneath.

Both implementations perform the multiplication of square matrices A and B, where A is a matrix full of ones, and B is an identity matrix. The expected output on C is a matrix full of ones.