Open VI reference for VITs and VIs

Hi
I have a VIT and I get the reference using the Open VI reference. When I change (rename) this back to a VI, and get the reference for it, its much faster. Does the open VI reference takes longer for VITs than VIs in obtaining a reference?
Another question is the same VIT, takes lesser time to get the reference using the Open VI reference in LabVIEW 8.5.1. It takes longer in LV8.6. Why is this happening?
Thanks
Vaa San.

The two main differences between a VI and a VIT are that VITs are never run, but are templates that generate a VI instance immediately that has all the properties, attributes and limitations of a VI. A VI on the other hand has only one instance (unless you make it reentrant)
· A VI generated by a VIT is debuggable just like a VI in that you can trace the execution along the wires. In general, a VIT creates a copy of the VI in memory when you open a reference to it. Creating that copy takes time, which affects performance when doing recursion. That copy is then a standard VI in every sense, except it is not a file. Also, if you don't close these references, they will take up space in your RAM. Reentrant VIs can currently only do real recursion in 8.5 and if they are part of a class. If you open a VIT, you don't open the actual file, but a clone. This way you can open it multiple times. Each time you open it, you get a clone. This is especially useful when you open the VIT with VI Server. VIT's are useful to make an interface window once, and use it multiple times in your program. If the code should run multiple times, but doesn't have a user interface, use reentrant VI’s instead. As far as having the project open, a VI will reload all instances related to the project therefore causing the Vi to load slower. Best Regards,
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National Instruments

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my code calls some subVIs by reference by using "Open VI Reference" and "Call by Reference" VIs. Now, "Open VI Reference" expects a path to the VI:
When the SubVIs sit in the same folder as the calling VI, it is easy to simply supply the name of the SubVI. However, I would like to call a SubVI that is part of a project library sitting somewhere else on the disk. I could give the relative path, but this make the code pretty inflexible and if the relative path changes all the paths would need to be ammended. Ideally, I want to utilize the fact that I am using a project library. The help for Open VI Reference states that
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That should work, but you have to pay attention to something that's stated both in the help and in the error - if you use a string, the only way for LV to know what to access is if that something is already "in memory" (sometimes also referred to as "being loaded"). In the case of standard libraries, that means the VI itself or one of its callers has to be loaded. In the case of classes and XControls, loading the library (as in having it in an open project) should be enough to also load all of its members.
Hm, thanks, I am not advanced enough to know about classes and XControls, but I will check it out. My VIs are part of a library but obviously don't get loaded because, as you said, all their calls are dynamic.
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Hm, this actually gives me an idea! I could add an enable input to all these dynamically called VIs so that the logic runs only when enable is ON; otherwise the VI is called but does nothing. Then I call the VI first statically with enable=OFF just to load it in memory and then proceed with my dynamic call. A little ad-hoc, but should work and serve my purposes, I think.
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