Function deviceL2CacheSize

src/library/common/devinfo-cache.c:122–484

    "}                                                              \n";

cl_ulong
deviceL2CacheSize(
    cl_device_id device,
    cl_int *error)
{
    const size_t MAX_CACHE_SIZE = 1024 * 1024;
    const size_t MIN_CACHE_SIZE =    1 * 1024;
    const size_t STEP           =    4 * 1024;

    /* Bigger number of rounds increases time measurement precision,
     * but slows the test down.
     */
    const unsigned int ROUNDS = 32;

    /* Repeat each kernel run sereval times for higher reliability. */
    const unsigned int RELIABILITY_ROUNDS = 5;

    cl_int err;

    cl_uint maxComputeUnits;
    cl_bool imageSupport;

    cl_platform_id platform;
    cl_context_properties props[3] = { CL_CONTEXT_PLATFORM, 0, 0 };
    cl_context ctx;
    cl_command_queue queue;
    cl_program program;
    cl_kernel kernel;
    cl_event event;

    cl_float *in;
    size_t width, height;
    const cl_image_format format = { CL_RGBA, CL_FLOAT };
    cl_mem imgIn;
    size_t origin[3], region[3];

    cl_float4 out;
    cl_mem bufOut;

    size_t global_work_size, local_work_size;
    cl_ulong start, end, avg;
    cl_long *times;
    cl_double d, max;

    size_t steps;
    size_t i, t;

    /* Collect device properties. */
    err = clGetDeviceInfo(device, CL_DEVICE_MAX_COMPUTE_UNITS,
        sizeof(cl_uint), &maxComputeUnits, NULL);
    if (err != CL_SUCCESS) {
        if (error != NULL) {
            *error = err;
        }
        return 0;
    }
    err = clGetDeviceInfo(device, CL_DEVICE_IMAGE_SUPPORT,
        sizeof(cl_bool), &imageSupport, NULL);