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.

      • graycube@lemmy.world
        9·
        5 months ago

        Sometimes after upgrades, even minor ones, I find it useful to run analyze on all of the tables. I usually do analyze verbose; so I can see which tables are getting analyzed. This will assess every table so the query planner can make better decisions about how to resolve queries. If the query planner is making bad decisions I/O and CPU will be high and query performance will be poor.

        • DosDude👾OPA
          5·
          5 months ago

          Thanks. I ran it. Hopefully it’ll make a difference.

          Edit: It looks like this did the trick. I’ll keep monitoring to see if it sticks. Thanks again!

    • DosDude👾OPA
      2·
      5 months ago
      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·
        5 months ago

        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.

    • mlg@lemmy.worldEnglish
      3·
      5 months ago

      commit “fixed stuff”

      2.8k blob of crypto mining code

      Would be hilarious

    • DosDude👾OPA
      2·
      5 months ago

      I have. And I tried to tweak it with no avail. But it was working within acceptable levels before the update.

      • taaz@biglemmowski.winEnglish
        2·
        5 months ago

        hmm, how many connections are used SELECT count(*) FROM pg_stat_activity; ?
        I am not a master postgres admin but my intuition has been that the amount of connections is a big factor in how pg behaves with cpu and mem.

        • DosDude👾OPA
          1·
          5 months ago
          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'

            • DosDude👾OPA
              2·
              5 months ago

              I added pg_stat_statements, and ran it. This was the result:

              # SELECT count(*) FROM pg_stat_activity;
 count
-------
    11
(1 row)
              • taaz@biglemmowski.winEnglish
                3·
                5 months ago

                do you also have pict-rs connected to this postgres instance? that is surprisingly low number to me, I would have expected anywhere between 20-50 active connections (I use 50 for lemmy and 20 for pict-rs, configured in their respective conf files)