Description of problem:

atopgpu fails to start because pynvml is not installed. python3-py3nvml is installed as a dependencie though.


Version-Release number of selected component (if applicable):

atop-2.6.0-6.el8.x86_64

How reproducible:

Always

Steps to Reproduce:

# yum install atop

# systemctl start atopgpu.service
Job for atopgpu.service failed because the control process exited with error code.
See "systemctl status atopgpu.service" and "journalctl -xe" for details.

# # systemctl status atopgpu.service
● atopgpu.service - Atop GPU stats daemon
   Loaded: loaded (/usr/lib/systemd/system/atopgpu.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Mon 2021-10-18 11:05:20 CEST; 1s ago
     Docs: man:atopgpud(8)
  Process: 191751 ExecStart=/usr/sbin/atopgpud (code=exited, status=1/FAILURE)
 Main PID: 191751 (code=exited, status=1/FAILURE)

Oct 18 11:05:20 maestro-3002 systemd[1]: Starting Atop GPU stats daemon...
Oct 18 11:05:20 maestro-3002 atopgpud[191751]: atopgpud ERROR: Python module 'pynvml' not installed!
Oct 18 11:05:20 maestro-3002 systemd[1]: atopgpu.service: Main process exited, code=exited, status=1/FAILURE
Oct 18 11:05:20 maestro-3002 systemd[1]: atopgpu.service: Failed with result 'exit-code'.
Oct 18 11:05:20 maestro-3002 systemd[1]: Failed to start Atop GPU stats daemon.

pynvml is not available:

# python3 -c "import pynvml"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'pynvml'

But python3-py3nvml
# python3 -c "import py3nvml"

My guess is that py3nvml is not a drop-in replacement for nvidia-ml-py. Atop upstream mentions nvidia-ml-py as a dependencie, not py3nvml. 

I've tried to modified the import naively with:

#import pynvml
import py3nvml.py3nvml as pynvml

But it is not that simple (from journalctl -u atopgpu):

systemd[1]: Starting Atop GPU stats daemon...
atopgpud[192025]: atopgpud INFO: Number of GPUs: 4
systemd[1]: Started Atop GPU stats daemon.
atopgpud[192024]: Traceback (most recent call last):
atopgpud[192024]:   File "/usr/sbin/atopgpud", line 583, in <module>
atopgpud[192024]:     main()
atopgpud[192024]:   File "/usr/sbin/atopgpud", line 288, in main
atopgpud[192024]:     gpulist.append( GpuProp(i) ) 
atopgpud[192024]:   File "/usr/sbin/atopgpud", line 74, in __init__
atopgpud[192024]:     self.stats.devname     = pynvml.nvmlDeviceGetName(gpuhandle).decode(
atopgpud[192024]: AttributeError: 'str' object has no attribute 'decode'

Using nvidia-ml-py-11.470.66 and installing it using "python3 setup.py install --prefix=/usr", everything works.