starpu-max/doc/vector_scal_opencl.texi

#include <starpu.h>
#include <starpu_opencl.h>

extern struct starpu_opencl_program programs;

void scal_opencl_func(void *buffers[], void *_args)
@{
    float *factor = _args;
    int id, devid, err;
    cl_kernel kernel;
    cl_command_queue queue;

    /* length of the vector */
    unsigned n = STARPU_VECTOR_GET_NX(buffers[0]);
    /* local copy of the vector pointer */
    float *val = (float *)STARPU_VECTOR_GET_PTR(buffers[0]);

    id = starpu_worker_get_id();
    devid = starpu_worker_get_devid(id);

    err = starpu_opencl_load_kernel(&kernel, &queue, &programs, "vector_mult_opencl", devid);
    if (err != CL_SUCCESS) STARPU_OPENCL_REPORT_ERROR(err);

    err = clSetKernelArg(kernel, 0, sizeof(cl_mem), &val);
    err |= clSetKernelArg(kernel, 1, sizeof(n), &n);
    err |= clSetKernelArg(kernel, 2, sizeof(*factor), factor);
    if (err) STARPU_OPENCL_REPORT_ERROR(err);

    @{
        size_t global=n;
        size_t local=n;
        err = clEnqueueNDRangeKernel(queue, kernel, 1, NULL, &global, &local, 0, NULL, NULL);
        if (err != CL_SUCCESS) STARPU_OPENCL_REPORT_ERROR(err);
    @}

    clFinish(queue);

    starpu_opencl_release_kernel(kernel);
@}