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mynameisedgar_

•Created by mynameisedgar_ on 12/10/2023 in #✋｜help

Code not executed as expected

Hey Guys, I am using pythons dash package to build a website. My application is somewhat compute intensive. That is why I want to compute the results when the server starts, so that the website can use the cached results and is more responsive. But the code for the pre-computation is not being executed. Right now the website consists of a single app.py file that contains the dash code. At the top of my program I call:

app = dash.Dash(__name__, external_stylesheets=[dbc.themes.DARKLY, dbc.icons.FONT_AWESOME])
server = app.server

app = dash.Dash(__name__, external_stylesheets=[dbc.themes.DARKLY, dbc.icons.FONT_AWESOME])
server = app.server

Then comes my function definition precompute_and_save_figures() and below that all of the dash definitions for the website. At the bottom I have my name equals main check and start the application:

if __name__ == "__main__":
    logging.info("Starting server")
    start = time.time()
    precompute_and_save_figures()
    end = time.time()
    logging.info(f"Precomputation took {end - start} seconds")
    app.run()

if __name__ == "__main__":
    logging.info("Starting server")
    start = time.time()
    precompute_and_save_figures()
    end = time.time()
    logging.info(f"Precomputation took {end - start} seconds")
    app.run()

Locally, on my Windows PC this works just fine and it computes all of the results I need. So I think it has something to do with the Procfile and how the Code is being executed. The Procfile looks like this:

web: gunicorn app:server --workers 2

web: gunicorn app:server --workers 2

When I deploy this I think it should at least print out the logging statements in the Deploy Logs. But that isn't the case. I also know it did not do the computation beforehand since the application is very slow. How can I fix this? I appreciate your help! Edit: I think I should also mention that the precompute_and_save_figures() function uses multiprocessing so it needs to be ecapsulated in a name == main block.

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