st-cache-data guides, questions and discussions

Article0 replies3,793 followingPosted 14 Jan 2026, 08:22 UTC43.4K views1,949 votes

Streamlit cache misdiagnosis: when st.cache_data and st.cache_resource misbehave

A diagnostic guide for Streamlit caching problems: wrong decorator choice, unhashable arguments, and per‑process sharing causing data leaks or reload loops.

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Question1 answer1 comment1,495 followingPosted 25 Nov 2022, 10:06 UTC48K views1,016 votes

owner commented

st.cache_data: ttl expiry or manual .clear() for data that updates on a schedule?

I have a Streamlit app (modern st.cache_data / st.cache_resource API) where a cached function reads a dataset that is refreshed by an external job at known times, roughly every few hours. The cache key (function name, arguments, code hash) does not change when the underlying data changes, so without intervention users keep seeing the stale result. I'm weighi

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Question1 answer1,701 followingPosted 23 Aug 2021, 15:09 UTC120.9K views2,243 votes

owner answered

@st.cache_data memory growth across reruns: choosing eviction settings to keep RSS stable

Goal I am designing a Streamlit app (version 1.18 or later) that uses @st.cache_data to cache large DataFrames returned from a data-loading function. Widget interactions rerun the script with varying filter parameters, so each distinct parameter combination creates a new cache entry. The goal is to keep the server process memory footprint bounded over long u

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Streamlit cache misdiagnosis: when st.cache_data and st.cache_resource misbehave

st.cache_data: ttl expiry or manual .clear() for data that updates on a schedule?

@st.cache_data memory growth across reruns: choosing eviction settings to keep RSS stable