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Running drunc

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Pawel Plesniak edited this page Sep 9, 2024 · 17 revisions

This will outline the drunc running prerequisites and operations

Set up the virtual environment

Once you have set up drunc with or without DUNE-DAQ, in the working directory root run

source env.sh

to make sure all the environment variables are correctly set. This only necessary if you are returning to a work directory.

Running drunc

This can currently be done either with drunc-unified-shell, which is recommended for first time/casual users, or with a process-manager-shell and controller-shell, which is recommended for expert developers.

All of the drunc shells support tab completion.

With drunc-unified-shell

Spawning the shell and process_manager

In your terminal window run drunc-unified-shell as

drunc-unified-shell <process_manager_configuration> <DAQ_configuration_file> <session_name>

For which <process_manager_configuration> can be

  • The name of a configuration file defined in drunc/src/drunc/data/process_manager/
  • The path to name of a custom configuration file, relative or absolute
  • <DAQ_configuration_file> - the name of the DAQ system configuration file, typically defined in appmodel
  • <session_name> - the name of the session defined in <DAQ_configuration_file>

Interacting with process_manager

At this point the process_manager has been spawned, and you can interface it directly through the current shell. You can now spawn the DAQ processes as

drunc-unified-shell > boot

An example of the expected output is provided here. You can then check the running processes with ps as

drunc-unified-shell > ps
                                                      Processes running                                                       
┏━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━━━━┓
┃ session      ┃ friendly name             ┃ user     ┃ host      ┃ uuid                                 ┃ alive ┃ exit-code ┃
┡━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━━━━┩
│ test-session │ root-controller           │ pplesnia │ localhost │ cb986b26-221c-4819-bc9b-20825b11bee9 │ True  │ 0         │
│ test-session │   local-connection-server │ pplesnia │ localhost │ 0994f364-8d1f-4ccc-98f1-1872f8722b0f │ True  │ 0         │
│ test-session │   ru-controller           │ pplesnia │ localhost │ 2715c09e-d568-4e86-80a2-bb7827fd46fc │ True  │ 0         │
│ test-session │     ru-01                 │ pplesnia │ localhost │ d93f7922-377e-463f-8b26-523b73fb7d6b │ True  │ 0         │
│ test-session │   df-controller           │ pplesnia │ localhost │ d91c71f7-3c41-4a7e-aab0-7fb98d99c071 │ True  │ 0         │
| ...          | ...                       | ...      | ...       | ...                                  | ...   | ...       |
└──────────────┴───────────────────────────┴──────────┴───────────┴──────────────────────────────────────┴───────┴───────────┘

The full expected output is shown here.

We have started a couple of processes - the standard DAQ applications organized into segments each with a controller, and a root-controller that will control all the segments. The logs and work directory is the ${PWD} where you executed the drunc-unified-shell. From here you can use the process_manger commands

  • ps - list all the processes
  • kill - kill specific processes
  • flush - remove dead processes
  • restart - restart processes
  • logs - show the logs of specific processes
  • terminate - kill all the processes

There are many more functionalities to the shell, head over to the process manager documentation to see how to interact with it.

Interacting with root-controller

Next, let's send commands to the root-controller. These commands will be propagated by it to other applications using gRPC. To see which segments a controller controls, you can use ls:

drunc-unified-shell > ls
['ru-controller', 'df-controller', 'trg-controller', 'hsi-controller']

The set of commands that you can send to the root-controller are

  • describe - shows available endpoint commands (not this currently describes what the controller endpoint can do internally not through the shell)
  • ls - lists all running segments
  • status - lists the FSM state, substate, error status, and included parameters of the segments
  • connect - remaps the root controller
  • take_control - updates the user in charge (actor)
  • surrender_control - releases the current actor
  • who_am_i - prints your username
  • who_is_in_charge - prints who is in charge of the root controller
  • include - includes self in the current session
  • exclude - excludes self from the current session

FSM transitions can be executed directly from the shell with the commands:

  • conf - configure the applications by ingesting the parameters from the configuration file to the applications
  • start - start a run, allocating a run number. Initializes queues and connections
  • enable_triggers - start generating TPs, TDs are not propagated to the DFO
  • disable_triggers - stop collecting generated TPs to file
  • drain_dataflow - stop propagating TDs to the TRBs.
  • stop_trigger_sources - stop generating TPs
  • stop - stop app communication
  • scrap - remove all the configuration parameters from the applications

Operating a DAQ with drunc

Let's take the DAQ for a spin:

drunc-unified-shell > conf
drunc-unified-shell > start 12345 # start the run 12345
drunc-unified-shell > enable-triggers
[...we wait for a bit of time, to get a file...]
drunc-unified-shell > disable-triggers
drunc-unified-shell > drain-dataflow
drunc-unified-shell > stop-trigger-sources
drunc-unified-shell > stop
drunc-unified-shell > scrap

Several things to note:

  • There is a profusion of logging that happens. This is coming from the asynchronous logging from the controller. If someone tries to connect at the same time or to execute a command you will see it appearing on your shell too (you can try it yourself in a different shell). Unfortunately CLIs do not lend itself very well with this, and one needs a better UI for the logs to be rendered better and to not distract.
  • The describe command describes the endpoint NOT the shell. This means that there are some commands that are not directly available in the shell (for example get_children_status). However if you do status is the shell, you will get the children statuses because the shell calls get_children_status under the hood.

You can now head to the controller documentation for more information.

Shutting down

drunc-unified-shell > kill --session test-session
drunc-unified-shell > quit

or

drunc-unified-shell > terminate
drunc-unified-shell > quit
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