Overhead generated by calling clCreateBuffer

Hi everyone,

I'm using OpenCL on an Exynos 8890 Octacore CPU with ARM Mali-T880 MP12 GPU (Samsung S7 edge). And it is taking a high overhead when creating a buffer from the call clCreateBuffer. I'd like to know more about this issue. Is anything related with the driver that takes all this time? Why it takes a long time to create the buffer?

Below are described the example used and the sizes with their respective time. Observe that I'm creating two buffer each one with size of N*N elements of type float.

    #define DATA_TYPE float

    int N = 8192;  

    t_start = rtclock();

#ifdef OFFLOAD

    a_mem_obj = clCreateBuffer(clGPUContext, CL_MEM_READ_ONLY, sizeof(DATA_TYPE) * N * N, NULL, &errcode);

    b_mem_obj = clCreateBuffer(clGPUContext, CL_MEM_READ_WRITE, sizeof(DATA_TYPE) * N * N, NULL, &errcode);

#else

    a_mem_obj = clCreateBuffer(clGPUContext, CL_MEM_READ_ONLY | CL_MEM_ALLOC_HOST_PTR,  sizeof(DATA_TYPE) * N * N, NULL, &errcode);

    b_mem_obj = clCreateBuffer(clGPUContext, CL_MEM_READ_WRITE | CL_MEM_ALLOC_HOST_PTR, sizeof(DATA_TYPE) * N * N, NULL, &errcode);

#endif

    t_end = rtclock();

    printf("Total time of clCreateBuffer %lf \n" , t_end - t_start);

PD. Executing the same program on an Intel GPU doesn't take a long time when compared with the time taken by Mali GPU.

Thanks!!!