I am calling the SubVI called "Addition.Vi" from the Main VI two times. In first case i haven't checked the property Reentrant and i am executing the main program. So only one instance will be created and the SubVi's will be executed sequentially. In second case i checked the property Reentrant in SubVI. So multiple instance will be created and the subVI's will execute simultaneously. Here my question is is there any difference in memory usage for both the cases?