Does Labview allocate twice the memory for arrays passed to a subvi?

[jisaacs]

When I pass an array of 1 million points to a sub-vi does labview create a copy of this data in another place in memory?

[Mads]

Yes. SubVIs keep their own copies. This is one of the reasons why rules like modulizing the code into sub-VIs are best not followed when you work with *really* large data sets; then it's best to keep the code as "flat" as possible.

I think there has been a large thread here about this earlier where Greg McKaskle explained this in detail.