App performance caching and multithreading

[randyzwitch]

Hi @Thiemo_Seys -

For your first issue with missing ReportContext, please see the following post:

How to run a subprocess programs using thread inside streamlit?

Hey @ITMSEC17, welcome to Streamlit! Yeah, this isn’t well-documented in Streamlit. If you want to perform Streamlit calls from within threads you create, you need to attach a Streamlit “ReportContext” to those threads. (This is a bit of state that lets Streamlit know which user session the thread belongs to.) Here’s how to attach a ReportContext to your thread. You should do this after creating the thread, and before starting it. from streamlit.ReportThread import add_report_ctx # Your thre…

In terms of rebuilding the UI elements, I would suggest moving those outside of your function calls, which should minimize any remounting.

Best,
Randy