It's impossible, but it happens.
LV2013, Win7
OK, I'm working on a project which has a container window ("MegaMonitor").
On the window is a single TAB control with 12 pages.
On each page are 6 SubPanels, nothing else.
There is a single VI called the "Block" VI.
I put one instance of that VI into each of those 72 SubPanels, and the whole thing should run.
There is a TCP data stream coming in at 10 Hz, that gets decimated into various history arrays. Each Subpanel chooses a way to view a certain set of channels from that datastream.
The problem is, sometimes the process works just fine and dandy, The window opens up and starts running in 3-4 seconds, it shuts down in less than 1 second.
Sometimes it's like walking thru sludge - it takes 20-30 seconds to open up and run, it takes 60 or more seconds to shut down and recover.
I don't know what will make it work fast or slow - a restart TENDS to make it work fast the first time after, but not always.
Here is the launching code, in the container window:
I've tried CALL and FORGET, and CALL and COLLECT methods, rather than the RUN VI method - no real difference in behavior.
I've tried AUTO DISPOSE REF bothe TRUE and FALSE - no difference.
I need to know when the process has shutdown. The BLOCK Vi, as the first thing it does, puts a value into a STOP queue, and as the last thing it does, it takes a value OUT.
So the CONTAINER window can look for an empty queue to determine that it's done.
Here is that Shutdown Code:
There is an EVENT which triggers shutdown of the window - each block sees that event and shuts down:
After the event is heard, we log a debug message:
We save a few things in a PREFS structure:
We log another debug message:
And, as the last thing we do, we de-queue an item from the STOP queue:
The "SAVE A FEW THINGS" part is pretty simple - just store a structure into an array:
The SEND DEBUG thing just formats a string and sends via UDP to a receiver elsewhere. The sludge behavior happens whether debugging is turned on or not.
Stay Tuned for the impossible part...
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks
Solved!
Go to Solution.
So, here is a debugging log, with comments interspersed:
287115 - MM Unit 0 Block 3 Queue Event.
287115 - MM Unit 0 Block 1 Queue Event.
--- The QUEUE event is normal operation - Here we get a STOP event.
287189 - MM Unit 0 Block 1: About to Close
287234 - MM Unit 0 Block 6: About to Close
287235 - MM Unit 0 Block 10: About to Close
287236 - MM Unit 0 Block 4: About to Close
287236 - MM Unit 0 Block 14: About to Close
287237 - MM Unit 0 Block 12: About to Close
287238 - MM Unit 0 Block 16: About to Close
287238 - MM Unit 0 Block 18: About to Close
287239 - MM Unit 0 Block 19: About to Close
287240 - MM Unit 0 Block 26: About to Close
287240 - MM Unit 0 Block 23: About to Close
287241 - MM Unit 0 Block 28: About to Close
287241 - MM Unit 0 Block 7: About to Close
287242 - MM Unit 0 Block 5: About to Close
287242 - MM Unit 0 Block 11: About to Close
287243 - MM Unit 0 Block 8: About to Close
287244 - MM Unit 0 Block 15: About to Close
287245 - MM Unit 0 Block 20: About to Close
287245 - MM Unit 0 Block 24: About to Close
287246 - MM Unit 0 Block 3: About to Close
287246 - MM Unit 0 Block 0: About to Close
287247 - MM Unit 0 Block 27: About to Close
287247 - MM Unit 0 Block 25: About to Close
287247 - MM Unit 0 Block 31: About to Close
287248 - MM Unit 0 Block 53: About to Close
287267 - MM Unit 0 Block 30: About to Close
287267 - MM Unit 0 Block 32: About to Close
287268 - MM Unit 0 Block 41: About to Close
287268 - MM Unit 0 Block 36: About to Close
287269 - MM Unit 0 Block 35: About to Close
287269 - MM Unit 0 Block 13: About to Close
287269 - MM Unit 0 Block 37: About to Close
287269 - MM Unit 0 Block 22: About to Close
287269 - MM Unit 0 Block 9: About to Close
287269 - MM Unit 0 Block 34: About to Close
287269 - MM Unit 0 Block 57: About to Close
287269 - MM Unit 0 Block 21: About to Close
287269 - MM Unit 0 Block 33: About to Close
287270 - MM Unit 0 Block 2: About to Close
287270 - MM Unit 0 Block 43: About to Close
287270 - MM Unit 0 Block 45: About to Close
287270 - MM Unit 0 Block 46: About to Close
287271 - MM Unit 0 Block 48: About to Close
287271 - MM Unit 0 Block 49: About to Close
287271 - MM Unit 0 Block 50: About to Close
287271 - MM Unit 0 Block 64: About to Close
287271 - MM Unit 0 Block 51: About to Close
287271 - MM Unit 0 Block 29: About to Close
287271 - MM Unit 0 Block 54: About to Close
287290 - MM Unit 0 Block 47: About to Close
287290 - MM Unit 0 Block 55: About to Close
287291 - MM Unit 0 Block 44: About to Close
287291 - MM Unit 0 Block 42: About to Close
287291 - MM Unit 0 Block 40: About to Close
287291 - MM Unit 0 Block 39: About to Close
287292 - MM Unit 0 Block 38: About to Close
287292 - MM Unit 0 Block 56: About to Close
287292 - MM Unit 0 Block 58: About to Close
287292 - MM Unit 0 Block 17: About to Close
287292 - MM Unit 0 Block 59: About to Close
287292 - MM Unit 0 Block 60: About to Close
287292 - MM Unit 0 Block 71: About to Close
287292 - MM Unit 0 Block 70: About to Close
287293 - MM Unit 0 Block 68: About to Close
287293 - MM Unit 0 Block 66: About to Close
287293 - MM Unit 0 Block 52: About to Close
287293 - MM Unit 0 Block 62: About to Close
287293 - MM Unit 0 Block 67: About to Close
287293 - MM Unit 0 Block 63: About to Close
287293 - MM Unit 0 Block 69: About to Close
287293 - MM Unit 0 Block 65: About to Close
287294 - MM Unit 0 Block 61: About to Close
--- OK, all 72 blocks got the event and are preparing to stop. They start closing:
287294 - MM Unit 0 Block 1: Closed
287294 - MM Unit 0 Block 6: Closed
287294 - MM Unit 0 Block 10: Closed
287294 - MM Unit 0 Block 4: Closed
287295 - MM Unit 0 Block 16: Closed
287295 - MM Unit 0 Block 14: Closed
Here, the container window chimes in, it's waiting for an empty queue. The population is still 72, but it's only been 1 mSec since they started closing, so no big deal.
287295 - Queue population: 72
And 39 more blocks are closing:
287295 - MM Unit 0 Block 12: Closed
287295 - MM Unit 0 Block 18: Closed
287295 - MM Unit 0 Block 19: Closed
287295 - MM Unit 0 Block 26: Closed
287295 - MM Unit 0 Block 23: Closed
287296 - MM Unit 0 Block 28: Closed
287296 - MM Unit 0 Block 5: Closed
287296 - MM Unit 0 Block 7: Closed
287296 - MM Unit 0 Block 11: Closed
287296 - MM Unit 0 Block 8: Closed
287296 - MM Unit 0 Block 20: Closed
287296 - MM Unit 0 Block 15: Closed
287296 - MM Unit 0 Block 24: Closed
287296 - MM Unit 0 Block 3: Closed
287297 - MM Unit 0 Block 0: Closed
287297 - MM Unit 0 Block 27: Closed
287297 - MM Unit 0 Block 25: Closed
287297 - MM Unit 0 Block 31: Closed
287297 - MM Unit 0 Block 53: Closed
287297 - MM Unit 0 Block 30: Closed
287297 - MM Unit 0 Block 32: Closed
287297 - MM Unit 0 Block 36: Closed
287297 - MM Unit 0 Block 35: Closed
287297 - MM Unit 0 Block 41: Closed
287297 - MM Unit 0 Block 13: Closed
287297 - MM Unit 0 Block 37: Closed
287297 - MM Unit 0 Block 22: Closed
287297 - MM Unit 0 Block 9: Closed
287298 - MM Unit 0 Block 34: Closed
287298 - MM Unit 0 Block 57: Closed
287298 - MM Unit 0 Block 21: Closed
287298 - MM Unit 0 Block 33: Closed
287298 - MM Unit 0 Block 2: Closed
Now, here, for some reason, LabVIEW stops doing what I ask it and goes into a corner and pouts:
287557 - Queue population: 33
287689 - Queue population: 33
287821 - Queue population: 33
287953 - Queue population: 33
288085 - Queue population: 33
288217 - Queue population: 33
288349 - Queue population: 33
288481 - Queue population: 33
288613 - Queue population: 33
288745 - Queue population: 33
288877 - Queue population: 33
289009 - Queue population: 33
289141 - Queue population: 33
289273 - Queue population: 33
289405 - Queue population: 33
289537 - Queue population: 33
289669 - Queue population: 33
289801 - Queue population: 33
Here it finally gets around to closing one more:
289861 - MM Unit 0 Block 43: Closed
And now, it's back to pouting:
289933 - Queue population: 32
290061 - Queue population: 32
290189 - Queue population: 32
290317 - Queue population: 32
290445 - Queue population: 32
290573 - Queue population: 32
290701 - Queue population: 32
290829 - Queue population: 32
290957 - Queue population: 32
291085 - Queue population: 32
291213 - Queue population: 32
291341 - Queue population: 32
291469 - Queue population: 32
291597 - Queue population: 32
291725 - Queue population: 32
291853 - Queue population: 32
291981 - Queue population: 32
292109 - Queue population: 32
292237 - Queue population: 32
292365 - Queue population: 32
292493 - Queue population: 32
292621 - Queue population: 32
292749 - Queue population: 32
292877 - Queue population: 32
293005 - Queue population: 32
293133 - Queue population: 32
293261 - Queue population: 32
293389 - Queue population: 32
293517 - Queue population: 32
293645 - Queue population: 32
293773 - Queue population: 32
293901 - Queue population: 32
294029 - Queue population: 32
294157 - Queue population: 32
294285 - Queue population: 32
294413 - Queue population: 32
294541 - Queue population: 32
294669 - Queue population: 32
294797 - Queue population: 32
294925 - Queue population: 32
It apparently did absolutely nothing toward closing the VIs for about 5 seconds.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks
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