Passing data within an application

[SercoSteveB]

Wires, Feedback Nodes, Shift registers and Global Variables are all ways to pass data within an application. 

In terms of VI Execution Speed, please order them from 'most' to 'least' efficient.

a) Wires, Feedback Node, Global Variable, Shift Register, .

b) Wires, Shift Register, Feedback Node, Global Variable.

c) Wires, Global Variable, Feedback Node, Shift Register.

d) Wires, Feedback Node, Shift Register, Global Variable.

[crossrulz]

I would go with B.

There were a few versions where the FN was a little slower than the SR, but I'm pretty sure NI fixed that issue.

[MrStevenUND]

For sure B or D.  Global is the worst. 

I'm thinking B as well, though I have no real good reason.

[VSC]

though i tried it out first i myself as well have no explanation. I have- to agree to B.

[sumapatil]

Ans is B

  But i don't have good reason

[RAMESHB]

Answer is B

              because Wires, Shift Register, Feedback Node, Global Variable here Global Variable is used to call another vi i think it is not use passing the data

[MrStevenUND]

How do "Functional Globals" fit in to the mix?  I've read FG's are better about memory usage, but what about speed?

My guess is Functional Globals would take longer than Globals.  The information of a FG is stored in the shift register of a subvi, where as the Global is in itself a VI. 

[crossrulz]

I would agree that FGVs are also slower.  You have case structures, subVI overhead, and reading/writing to the shift register or feedback node.  Though, I have also been told that reading a global variable is very similar in speed to a constant.  NI has done a lot to improve performance in the last couple of years.

[SercoSteveB]

Answer: B D.  Nice one. crossrulz, MrStevenUND, VSC, sumapatil & RAMESHB. 

Check out Passing Data within an Application of VI Execution Speed

[crossrulz]

According to that document, the answer is D.

[SercoSteveB]

Good spot.

[adiveppa]

Ans is D

[mini09]

Nice question and discussion known an unknown process in LabVIEW... thanks Steve... Agreeed with the explanation and answer..

[ashwinilele]

  Ans is B.

Then I read all discussion then I changed my ans to D