Unable to reinstance jtop after service restart

[jabesq]

Describe the bug If the jetson_stats.service restart, then it is impossible to recreate a new instance of jtop object in python apps, except by restarting everythin

To Reproduce Steps to reproduce the behavior:

1. in python console, open a jtop instance

   >>> with jtop() as jetson:
    ...

2. Restart jetson_stats.service
3. In the same python console, open a new jtop instance

   >>> with jtop() as jetson:
    ...
   Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "PATH/lib/python3.9/site-packages/jtop/jtop.py", line 1081, in __enter__
   self.start()
   File "PATH/lib/python3.9/site-packages/jtop/jtop.py", line 956, in start
   init = self._get_configuration()
   File "PATH/lib/python3.9/site-packages/jtop/jtop.py", line 905, in _get_configuration
   self._controller.put({'interval': self._interval})
   File "<string>", line 2, in put
   File "PATH/lib/python3.9/multiprocessing/managers.py", line 809, in _callmethod
   conn.send((self._id, methodname, args, kwds))
   File "/PATH/lib/python3.9/multiprocessing/connection.py", line 211, in send
   self._send_bytes(_ForkingPickler.dumps(obj))
   File "PATH/python3.9/multiprocessing/connection.py", line 416, in _send_bytes
   self._send(header + buf)
   File PATH/lib/python3.9/multiprocessing/connection.py", line 373, in _send
   n = write(self._handle, buf)
   BrokenPipeError: [Errno 32] Broken pipe

Expected behavior Ability to continue jtop API after service restart

Additional context Add any other context about the problem here.

Board

• SOC: Family: tegra194 - ID:25
• ID: [e.g. 10]
• Board(s): P1001-000
• Code Name: galen-industrial

Jetpack

• Jetpack 4.6 [L4T 32.6.1]

Jetson-Stats

• Version: 3.1.1

[rbonghi]

Hi @jabesq ,

I know I reply really late to this issue. As you notice, if you restart the service, you need to restart all jtop clients as well. I didn't notice any workaround to fix this bug.

jtop use the SyncManager to communicate https://docs.python.org/3.9/library/multiprocessing.html#multiprocessing.managers.SyncManager

When the service crash crash also the pipe and all terminals crash. IF you know a workaround to fix it, let me know. I close this issue, but feel free to reopen it