Experimental Physics and
Industrial Control System

>If I disable UI Responsiveness Monitor by setting  ui_monitor_period=0 in file >core/ui/src/main/resources/phoebus_ui_preferences.properties
>while building css-phoebus, will it cause any trouble while using it?

Setting  ui_monitor_period=0 is exactly the way to disable the UI responsiveness monitor.
There are no downsides to doing that, except that if you do run into a UI freeze-up, you won't get a stack trace that might allow us to fix the underlying issue.

To set  ui_monitor_period=0, however, you should not edit the file core/ui/src/main/resources/phoebus_ui_preferences.properties and recompile.

Instead, set the preference value as described on https://control-system-studio.readthedocs.io/en/latest/preferences.html.
For example, put this into your local "my_settings.ini" file:

org.phoebus.ui/ui_monitor_period=0

and then start phoebus with "-settings /path/to/my_settings.ini"


> I am asking this because running css-phoebus on a remote system through SSH and X11 forwarding is affecting UI performance.

That is about the worst possible scenario ;-)
X-via-ssh used to be a very convenient way to run UI apps remotely, but it's also slow, and modern apps where a button is no longer just a flat rectangle but some rounded rect with shaded background etc., all those drawing commands tend to be slow via X/ssh. VNC or similar commercial tools like Thinlinc tend to offer much better performance.
Still, sometimes X-via-ssh is the only option you might have, and then setting the ui_monitor_period to zero makes sense.

Thanks,
Kay