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Yes, I know, you wanted to do this some day too. So I did it for you. Just run (and then stop) the Main VI from the attached set (Saved in LabVIEW 2016 32-bit). I suspect (and hope) the numbers will be quite a surprise and even a shock, especially for the fans of one particular method and some very aggressively promoted frameworks which use that method. Fastest update of indicator from subVI.zip

Of the messaging things plain queues should be the fastest message-oriented option because everything else (I think) is built on top. Notifiers, channels, etc use queues. All these options are pretty quick. >Last I remember reading, user event queues rely on some of the same underlying bits, but the UI-oriented and pub-sub nature of the code makes them a bit slower. Still generally fast enough for anything anyone ever uses them for. >>User events are completely nondeterministic (every option in this category is nondeterministic technically, but user events behave like garbage if you stress them). Property nodes obviously require locking the UI thread and suck, but control indices are sufficiently fast for most anything. If you eliminate the update-oriented part -- just sharing scalar values in other words -- then the fastest would be a global (requires a lock for write but I think the read side doesn't), then a DVR in read-only mode, then a standard DVR or FGV implementation (both need to lock a mutex). These are all faster than the message oriented variations, obviously, but thats because you get less than half the functionality.

One possible option with a bad hardware driver is to make your actor an independent exe, using the NetworkMessenger for communication Then you can kill the entire exe and restart cleanly. I've never done that, though.

Hi Max, Recovering from a stuck hardware actor is often impossible, as it is some dll call that is stuck and LabVIEW cannot abort the call. Nor can the dll be reloaded without restarting the entire application. However one still needs to recognise and report the problem. I use the "Timeout Watchdog" recently added to the library. The main actor uses that on the handling of some message that periodically comes from the hardware actor. Now, another unreliable actor is one that handles potentially large blocks of memory. An out-of-memory error will abort the actor, invalidating it's address, and you can use an "Address Watchdog" to notify Main. In that case you probably can restart the actor and recover.