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Volanta Plugin & Performance Issues

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Volanta Plugin & Performance Issues

Postby Avionyx » Mon Jan 22, 2024 11:54 am

Hi All,

Recording this here in case it's useful to others.

I've noticed, and had confirmed from other setups, that the latest version of the Volanta plugin can cause stuttering when used in FG 2020.3 onwards.
Behaviour noticed is that Volanta.nas is taking a long time to finish. Also the same set of alerts happen only during the execution of that .nas file:

Code: Select all
  661.59 [ALRT]:event      Subsystem events total  39.48s overrun 2032.00ms
  661.59 [ALRT]:event        +2032  (+2e+03ms).maketimer-[000001C03BFD0860]-X:/FlightGear 2020.4/data/Nasal/volanta.nas:15  total  46.68s
  662.15 [ALRT]:event      Subsystem events total  39.48s overrun   8.00ms
  662.15 [ALRT]:event        +8     (+8ms).settimer-X:/FlightGear 2020.4/data/Nasal/local_weather/weather_tile_management.nas:1213  total  0.041s
  666.00 [ALRT]:event      Subsystem events total  39.49s overrun   8.00ms
  666.00 [ALRT]:event        +8     (+8ms).settimer-X:/FlightGear 2020.4/data/Nasal/local_weather/local_weather.nas:1054  total  0.189s
  669.89 [ALRT]:event      Subsystem events total  39.50s overrun   8.00ms
  669.89 [ALRT]:event        +8     (+8ms).settimer-X:/FlightGear 2020.4/data/Nasal/local_weather/local_weather.nas:1054  total  0.197s
  673.74 [ALRT]:event      Subsystem events total  39.52s overrun   9.00ms
  673.74 [ALRT]:event        +8     (+9ms).settimer-X:/FlightGear 2020.4/data/Nasal/fuel.nas:70  total  0.032s


As a result FG will freeze for 10-20 seconds every 15-30 seconds of "running" time. No impact at all on system resources but FG just seems to stop.

Using in game debug sees a worst frame delay down to "events" of a 33310ms (average) delay and then pop back to average of 70FPS before it happens again 15-30 seconds later.

As it seems to be entirely related to the Volanta plugin I've raised it with the ORBX team via their support and they have helpfully replied that they are happy to look into it and will get back to me. I'll keep the thread up to date if there's any resolution but in the meantime if anyone is experiencing stutters and has the Volanta plugin installed it might be worth temporarily removing it to see if it resolves the issues.

Alex
Avionyx
 
Posts: 530
Joined: Mon Jan 11, 2010 4:07 pm
Location: EGMD
Callsign: G-AVYX
Version: 2020.4
OS: Manjaro

Re: Volanta Plugin & Performance Issues

Postby sryu1 » Mon Jan 22, 2024 12:00 pm

Hi Alex,

If I'm not mistaken, that happens when FG is running but volanta is tracking so FG searches for volanta to send its data to but it couldn't find a running volanta instance...
Take a look here: https://wiki.flightgear.org/Volanta#Fli ... ew_Seconds

Let me know if this fixed the problem :)
sryu1
 
Posts: 9
Joined: Wed Jun 08, 2022 11:43 am

Re: Volanta Plugin & Performance Issues

Postby Avionyx » Mon Jan 22, 2024 2:00 pm

Well worth a try, I had actually tested it with Volanta running but it wasn't picking up data - I wasn't overly bothered because I had just assumed it part of the issue and I'd be removing it anyway.
Actually it may be worth putting the effort into.
I'll give that a go and let you know.

Alex
Avionyx
 
Posts: 530
Joined: Mon Jan 11, 2010 4:07 pm
Location: EGMD
Callsign: G-AVYX
Version: 2020.4
OS: Manjaro


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