MAX_NUM_CLFILE     87 magick/opencl.h   cl_kernel kernels[MAX_NUM_CLFILE];
MAX_NUM_CLFILE     88 magick/opencl.h   cl_program programs[MAX_NUM_CLFILE]; //one program object maps one kernel source file
MAX_NUM_CLFILE     89 magick/opencl.h   char kernel_filename[MAX_NUM_CLFILE][256];   //the max len of kernel file name is 256