When does Dash release memory?

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I wrote a python Dash app and made it available within my organization using OpenShift. I’m not really knowledgeable about OpenShift but it seems to be running correctly, including when multiple users are involved.

My problem is with memory management. Each time a user initiates a new session, the memory used by Dash app increases by ~200MB when I look on OpenShift. When the user closes the browser tab, the consumed memory does not go down (not even after weeks). Essentially the amount of memory the Dash app consumes keeps growing.

I am probably missing something, but how do I get Dash to clear memory after the user closes the browser tab or after some time passes since the last action? The dcc.Store objects in my code have "storage_type = ‘memory’ ". But from what I understand the dcc.Store keeps all the stored data on the client side in the browser, so this should not increase the memory on the server.

I deployed my app with

app.run_server(debug=True, dev_tools_hot_reload=False, port=8080, host=“0.0.0.0”)

in case this matters.

Any help would be really appreciated! Right now I keep manually restarting the app to clear the memory but this is not practical at all. Thank you! enter image description here

openshift plotly-dash python
1 Answers

How much memory are you allocating to the container? Also, does the memory continually go up? Or once it reaches a certain level does it plateau? Are you tracking any GC behavior in Python?

I'm not an expert on Python memory management, and know nothing about Dash, but Python does manage its own memory heap and has a garbage collector. Thus it is completely normal behavior for Python to never deallocate memory, Python is essentially reserving the memory for potential future use. Once it needs memory it will garbage collect the unreferenced objects.

As long as you aren't running out of memory or seeing undesirable GC behavior, the best thing to do is just set reasonable memory requests/limits for the container and let the Python GC manage the memory it has been allocated.

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