Caugh exceptions during exiting

[germa89]

I have been seeing (using logging) that we tend to fall into some caugh exceptions when trying to exiting.

Here is the logging while exiting:

DEBUG - pymapdl_global -  launcher - get_start_instance - PYMAPDL_START_INSTANCE is unset. Using default value True.
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - exit - Exiting MAPDL
DEBUG - GRPC_127.0.0.1:50052 -  mesh_grpc - _reset_cache - Resetting cache
INFO - GRPC_127.0.0.1:50052 -  mapdl_core - run - PARAMETER  = /home/ubuntu/tmp/tmp/mapdl
DEBUG - GRPC_127.0.0.1:50052 -  mesh_grpc - _reset_cache - Resetting cache
INFO - GRPC_127.0.0.1:50052 -  mapdl_core - run - PARAMETER  = /home/ubuntu/tmp/tmp/mapdl
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _close_process - Closing processes
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_server - Killing MAPDL server
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _ctrl - Issuing CtrlRequest "EXIT" with option "".
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_process - Killing process using subprocess.Popen.terminate
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Killing MAPDL process: 9416
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Process 9416 couldn't be killed in 2 seconds
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Killing MAPDL process: 9415
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Process 9415 couldn't be killed in 2 seconds
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Killing MAPDL process: 9414
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - connectivity_callback - Channel connectivity changed to: ChannelConnectivity.IDLE
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Process 9414 killed properly.
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Killing MAPDL process: 9409
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Process 9409 killed properly.
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Killing MAPDL process: 9195
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Process 9195 killed properly.
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Killing MAPDL process: 9193
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Process 9193 couldn't be killed in 2 seconds
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _ctrl - Issuing CtrlRequest "VERSION" with option "".
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - connectivity_callback - Channel connectivity changed to: ChannelConnectivity.CONNECTING
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - connectivity_callback - Channel connectivity changed to: ChannelConnectivity.TRANSIENT_FAILURE
DEBUG - GRPC_127.0.0.1:50052 -  errors - wrapper - Re-connection attempt 1 after waiting 0.150 seconds
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _ctrl - Issuing CtrlRequest "VERSION" with option "".
DEBUG - GRPC_127.0.0.1:50052 -  errors - wrapper - Re-connection attempt 2 after waiting 0.450 seconds
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _ctrl - Issuing CtrlRequest "VERSION" with option "".
DEBUG - GRPC_127.0.0.1:50052 -  errors - wrapper - Re-connection attempt 3 after waiting 1.350 seconds
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _ctrl - Issuing CtrlRequest "VERSION" with option "".
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - is_alive - MAPDL instance is not alive because the channel is not 'IDLE' o 'READY'.
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _close_process - Closing processes
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_server - Killing MAPDL server
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _ctrl - Issuing CtrlRequest "EXIT" with option "".
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_process - Killing process using subprocess.Popen.terminate
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Killing MAPDL process: 9416
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Process 9416 killed properly.
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Killing MAPDL process: 9415
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Process 9415 killed properly.
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Killing MAPDL process: 9193
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _kill_child_process - Process 9193 killed properly.
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - is_alive - MAPDL instance is not alive because the channel is not 'IDLE' o 'READY'.
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - is_alive - MAPDL instance is not alive because retrieving version failed with:
Error:
MAPDL server connection terminated unexpectedly while running:
  VERSION
called by:
  _ctrl

Suggestions:
  MAPDL *might* have died because it executed a not-allowed command or ran out of memory.
  Check the MAPDL command output for more details.
  Open an issue on GitHub if you need assistance: https://github.com/ansys/pymapdl/issues
Error:
  failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:50052: Failed to connect to remote host: connect: Connection refused (111)
Full error:
<_InactiveRpcError of RPC that terminated with:
	status = StatusCode.UNAVAILABLE
	details = "failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:50052: Failed to connect to remote host: connect: Connection refused (111)"
	debug_error_string = "UNKNOWN:Error received from peer  {grpc_message:"failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:50052: Failed to connect to remote host: connect: Connection refused (111)", grpc_status:14, created_time:"2024-10-04T12:51:34.988171862+00:00"}"
>
DEBUG - GRPC_127.0.0.1:50052 -  mapdl_grpc - _remove_lock_file - Removing lock file after exit.

Caugh exceptions are expensive, so we should avoid them as much as possible.