c - OpenCL 无法为常量数组设置内核参数

Question

我正在尝试设置我的内核的参数，当我尝试设置 arg-0 这是边界时，我不断收到 CL_INVALID_ARG_SIZE。奇怪的是，如果我只注释掉第一个 clSetKernelArgs，所有其他似乎都有效。我认为这可能是常量数组的问题，除了它适用于 rand_seeds。

success = clSetKernelArg(solver_kernel, 0, sizeof(cl_float) * 10, bounds);
    if(success != CL_SUCCESS)
    {
        printf("%d\n", success);
        exit(1);
    }
    success = clSetKernelArg(solver_kernel, 1, sizeof(cl_float) * 2, seeds);
    if(success != CL_SUCCESS)
    {
        printf("%d\n", success);
        exit(1);
    }
    success = clSetKernelArg(solver_kernel, 2, sizeof(cl_int), &trials);
    if(success != CL_SUCCESS)
    {
        printf("%d\n", success);
        exit(1);
    }
    success = clSetKernelArg(solver_kernel, 3, sizeof(cl_int), &start_temp);
    if(success != CL_SUCCESS)
    {
        printf("%d\n", success);
        exit(1);
    }

这是我的内核头文件

  __kernel void solver_kernel
    (
        __constant float bounds[10],
        __constant int rand_seeds[2],
        int trials,
        int start_temp
    )

Answer 1

来自OpenCL specification :

The memory object specified as argument value must be a buffer object (or NULL) if the argument is declared to be a pointer of a built-in or user defined type with the __global or __constant qualifier.

所以你必须先创建一个缓冲区并将其设置为你的内核参数。应该是这样的

cl_mem bounds_buffer = clCreateBuffer(context, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR, sizeof(cl_float) * 10, bounds, &success); 
success = clSetKernelArg(solver_kernel, 0, sizeof(cl_mem), bounds_buffer);

你需要为 rand_seeds 参数做同样的事情，即使你在这一行没有得到错误(可能是因为 sizeof(cl_float) * 2 == sizeof(cl_mem) 偶然，这仍然会产生不正确的结果)。