llRequestAgentData DATA_ONLINE reports agent still online after they log off

My agent tracker is good about reporting when people log on, but take several minutes to notice when people have logged off. Is that a known behavior of llRequestAgentData, not being accurate up to the second when people log off?

there's a 0.1 second delay for llRequestAgentData, you also need to account for how often you're checking, lag, etc. i notice when my friends log out, i can still see their avatar for up to a minute, and llSensor still picks them up. and i'm in a very low lag sim. there's even been instances when they crash, i didn't realize they were gone until they log back in. i get the pop-up saying they logged in, but never got the one saying they logged out

I check for about 20 avatars. The check repeats 60 seconds after the last avatar is checked, so not very frequently (by my sense of "frequent". I check for one avatar at a time, I do not issue multiple requests all at once.

When a person logs out the status is reported as ONLINE ("1" for a few minutes more (several cycles of my 60 second delay timer). It is almost as if there is some lag in the database used by llRequestAgentData

Yeah, that's the behavior I've seen, too.

so your cycles runs like this?

check avatar
wait 60 seconds
check next avatar
wait 60 seconds
check next avatar
etc.

right?

if so, then each avatar is only being checked every 20 minutes

I think we've probably all had the experience of crashing but not knowing it, too. You can be disconnected from the system as far as everyone else is aware, yet your screen stays alive, you see life going on normally in SL, and you think you're still there. It's only when you try to move that you discover you're really logged out. Quite obviously, SL has multiple ways of defining "log in" and "log out," and they don't always agree with each other.

Cycle is check avatar, check avatar, check avatar, wait 60, repeat.

I'm starting to feel reassured if someone else sees this too, and it is not just the way I use the call.

The presence server is an asynchronous system, updates of avatars logging on and off aren't done immediately in real-time, there can be delays. It's all in the name of efficiency of the grid, you have to realized there can be hundreds, maybe thousands of people logging on and off at any given time. So use it as a guideline, not hard up-to-the-second status of if the avatar is online or not.

Thanks Darien. I suspected it was exactly that. I just wasn't sure how much of a delay others were seeing.

Case closed then.