I have inherited a dash app which calls a calculation intensive back-end. In order isolate user states and to provide intermediate results, I plan to have the following set-up: -Execute calculation heavy process after button click -Gradually write results of the process into an SQLite db (User ID …

There is a a lot of missing information so it’s not possible to tell you what the best approach will be for your problem. Can you add in more such how much data you’re processing, what type of system it’s running on (cores, mem, cloud provider), what type of calculations you are running. What module…

Hi, first of all thanks for the quick reply! Some background: The bottleneck is really complexity more than space (heavy financial sim). It uses python & C and has optional multiprocessing implemented. So not much gain in terms of back-end optimizations to be made. It is currently meant to be a “…

Got what you’re trying to accomplish. This doesn’t sound like a prototype to me. Prototype is the least possible thing you can do to get to proof of concept. If you need a POC then drop all the bells and whistles, you really don’t need callbacks and interactivity. If you want to put a few in to show…

Just as a reply to my own comment, to further clear things up: I see 2 possible solutions: Have the server run 2 parallel python sessions. One for the dash app & gunicorn workers, one for the model calculation. A button press sends the model parameters to the model process (I don’t know how ye…

It’s pretty common to send a job to a queue (celery) and spawn a sub-process to run the job in the background. I’m sure you can find information on how to do this with Flask. Yes possible but this is going to get complicated. You wouldn’t want to couple processing the data, depositing it to a d…

You’ll probably find the new loading states API , which is still in pre-release, helpful here. As for the the long running task side of things, there’s examples of people using libraries like Celery if you search in the forums (I think) for this kind of thing. But this is less a Dash-specific issue,…

Ooh, this project from the Dash Show and Tell thread looks like it could be helpful: [image] Boilerplate Heroku Dash App for Long Processes (show and tell) Dash Python Hi. We’re working on a generic solution for Dash apps that run relatively long processes (30s to 2 mins…

Running calculation-heavy process in background?

Dash Python

nedned December 29, 2018, 3:11am 8

Ooh, this project from the Dash Show and Tell thread looks like it could be helpful:

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Running calculation-heavy process in background?

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