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[SOLVED] Postgres using a lot of CPU since update (retrolemmy.com)

submitted 4 months ago* (last edited 4 months ago) by DosDude@retrolemmy.com to c/lemmy_support@lemmy.ml

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EDIT: It seems to have been fixed thanks to @graycube@lemmy.world. Running analyze verbose; in postgres.

After updating to 0.19.5 from 0.19.3 my postgres is often using up 500%+ of CPU according to docker stats and often going to 100% CPU on most cores according to htop. Also noticed in the uptime monitor:

htop shows one of the 5 postgres processes constantly on UPDATE. I think this might be part of the problem.

I'm not comfortable with postgres and am honestly completely in the dark how or where to mitigate or even pinpoint this issue.

Any help would be appreciated.

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[–] nutomic@lemmy.ml 4 points 4 months ago (1 children)

You can use pg_stat_statements to find slow queries. Try sorting by top total_exec_time.

[–] DosDude@retrolemmy.com 2 points 4 months ago (1 children)

ERROR:  extension "pg_stats_statements" is not available

Even though it's added in the customPostgresql.conf shared_preload_libraries = 'auto_explain,pg_stat_statements'

[–] static09@lemmy.world 4 points 4 months ago (1 children)

I know you already found a solution, but fwiw, it seems you have a typo in calling the extension. You have "stats" plural instead of "stat" singular.

[–] DosDude@retrolemmy.com 2 points 4 months ago

Well that would do it. Thanks for pointing out!