ret = cl.clReleaseMemObject(devSrcB);
checkError("on clReleaseMemObject", ret);
ret = cl.clReleaseMemObject(devDst);
checkError("on clReleaseMemObject", ret);
ret = cl.clReleaseProgram(program);
checkError("on clReleaseProgram", ret);
ret = cl.clReleaseKernel(kernel);
checkError("on clReleaseKernel", ret);