You can release memory used by a subVI by calling the Request Deallocation primitive, but that should be used only in extreme cases where you have very large amounts of data which is processed only inside the subVI.
Most of the time, you don't need to do any memory management if you're careful and avoid memory allocation.
Some things to look out for:
- Resizing arrays or strings inside loops. This is bad because it causes constant memory allocation.
- Using local or global variables. These cause a copy of the data to be made.
- Using different data types (e.g. DBL in one place and I32 in another. If the data is coerced, you get a memory allocation.
Do you have a specific problem?
To learn more about LabVIEW, I suggest you try searching this site and google for LabVIEW tutorials. Here, here, here, here, here and here are a few you can start with and here are some tutorial videos. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read the LabVIEW style guide and the LabVIEW user manual (Help>>Search the LabVIEW Bookshelf).
___________________
Try to take over the world!
