uWSGI hangs sometimes

[j-manu]

Description

uWSGI worker hangs sometimes after respawning. See WID 4 below with RSS 0 and VSZ 0.

Steps to Reproduce

Unfortunately, couldn't replicate reliably by load testing.

Additional details

Self hosted KPI version 2.021.45b
Sentry not enabled

This seems similar to kobotoolbox/kobocat#377 & DataDog/dd-trace-py#491

Why not set lazy-apps = true in uwsgi.ini ?

[noliveleger]

Hello @j-manu,
We were able to reproduce the problem with low settings and lots of requests.
According to our tests, it does seem to fix the problem with lazy-apps = true. Unfortunately, it also increases the resources footprint. Especially, when you have a lots of workers.
We'll continue to investigate.

[j-manu]

@noliveleger What do you mean by "low settings"?

[noliveleger]

With kobo-install:

Number of uWSGI workers to start?
[1]:
Maximum uWSGI workers?
[2]:
Maximum number of requests per worker?
[256]:
Stop spawning workers if uWSGI memory use exceeds this many MB:
[128]: