Google AppEngine Exceeded hard memory limit of

2023-11-27
it
#wtangy, #nhl, #gae, #google, #gcs, #grafana, #google app engine, #python, #gunicorn, #wasthereannhlgamelastnight
fi

Have you seen these error messages before?

10:22:23.481686Z Exceeded hard memory limit of 384 MiB with 400 MiB after servicing 3 requests total. Consider setting a larger instance class in app.yaml.
10:18:23.473577Z Exceeded hard memory limit of 384 MiB with 393 MiB after servicing 7 requests total. Consider setting a larger instance class in app.yaml.

I saw these with:

Google's AppEngine and a Python Flask webservice.
Wanting to stick with Free Tier (and dynamic instance F1).

I should not have used the default gunicorn settings of 4 workers, but rather follow their guidance and use 2!

Massive speedup seen, from always >300ms and frequently over 5 seconds to respond, it's now down to just a few milliseconds. Probably because the instance was I guess using all the memory. But when memory really was exceeded the app was killed and restarted resulting in even higher latency.

There is IT in Helsinki

Google AppEngine Exceeded hard memory limit of

before (the Y axis is in seconds)

after