Unexpected delay when dynamically called VI closes

LV10.0 / WXP
A VI is called dynamically by Run VI Method (Wait Until Done = FALSE, Auto Dispose Ref = TRUE).
Queues are used to exchange data with the main VI.
When this VI closes ("stop" message from the main VI), LabVIEW hangs for about 25 seconds (!) with one of the CPUs of the dual core machine at 100%.
Has anyone else encountered this strange behaviour ? Any ideas ?
Many thanks in advance
Solved!
Go to Solution.

Norbert B a écrit :
Can you give us a small picture of the way you are calling and releasing the subVIs?
As mentionned in my first message : Run VI Method (Wait Until Done = FALSE, Auto Dispose Ref = TRUE) is used to call the VIs.
Release : after reception of a "close" message (queue), the dynamic VIs terminate their execution
If called with Auto Dispose Ref = FALSE, the freeze appears when Close Reference is executed in the calling VI (after reception of a "I'm closing" message from the dynamic called VI).
If loading the VI takes only a short time but unloading takes long, it seems to me that those subVIs allocate many new handles/memory spaces during runtime. Is that the case?
As mentionned in a previous message : The memory usage changes from about 687 to 676 MB when the four
instances are closed. The number of handles decreases from about 272k to
61k.
This sounds like the whole application freezes for the time being. Is it a single loop architecture?
No. It is a rather big application with several VIs running independently and exchanging data through queues.
In addition: You call those subVIs dynamical with reentrant execution (at least some of them). So they should run in parallel.
Yes, they run in parallel.
Did you configure different preferred execution systems for your different subVIs?
Yes, I have tried several combinations and also changed the Priority. I also tried to replace the While Loop of the VI which communicates with the PLC by a Timed Loop in order to specify the processor. Unfortunately all my trials ended without any succes.
Did you check for reference leaks using the Execution Trace Toolkit?
Yes. There are none.
Norbert
Thank you very much for your help

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Unexpected delay when dynamically called VI closes

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