Even Easier Introduction to CUDA - not printing after memory initialization - memory

Question

I'm following the Even Easier Introduction to CUDA tutorial. I have literally copied and pasted the complete code. add.cu compiles, however, when I run it, it doesn't print anything. I put in some more print statements and narrowed it down:
printf("Hi\n");
for (int i = 0; i < N; i++) {
x[i] = 1.0f;
y[i] = 2.0f;
}
printf("Bye");
It prints "Hi", but never prints "Bye". So something seems to be wrong with the memory initialization. What is going wrong here?

Answer 1

I solved the problem myself. Basically, my device drivers were screwed up. To check if you have the same problem, run Command Prompt as administrator and run nvidia-smi. If you have the same problem, it will give you an error saying it failed to communicate because your device drivers are not up to date or wrong or something of the sort.
Download the latest nvidia driver for your computer (I found mine on Dell Drivers & Downlods) and install it. Now, when you run nvidia-smi as admin on command prompt, it should give you a whole bunch of details about your setup (driver version, Cuda version, etc) like this:
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 441.14 Driver Version: 441.14 CUDA Version: 10.2 |
|-------------------------------+----------------------+----------------------+
| GPU Name TCC/WDDM | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 105... WDDM | 00000000:01:00.0 Off | N/A |
| N/A 30C P8 N/A / N/A | 78MiB / 4096MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| No running processes found |
+-----------------------------------------------------------------------------+
You should now be able to compile and run Cuda scripts with unified memory.