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  1. MariaDB Server
  2. MDEV-29097

10.8.3 seems to be using a lot more swap memory, always increasing (every time mariabackup runs daily)

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Not a Bug
    • Affects Version/s: 10.8.3
    • Fix Version/s: N/A
    • Component/s: Server
    • Labels:
      None

      Description

      I don't remember having this issue with 10.5, as although it was using a good amount of swap memory, I never had to do an emergency database restart because of it.

      Since a few days ago, I had been receiving alerts about too much swap being used on the server, and it's been getting worse. I had to restart MariaDB yesterday, because it was getting full.

      Before the restart, this was the usage:

      Resident RAM:
      mariadbd – 89387556 (85.25 GB)

      Swap:
      mariadbd – 26975616 (25.73 GB)

      And by the way, my server's sysctl has this config:

      vm.swappiness=1
      (which means to only use Swap if absolutely necessary; while =0 would disable it)

      My innodb_buffer_pool_size is 80G.

      Are you aware of any reason so much Swap would be used by MariaDB?

      There was plenty of resident free RAM that could be used instead.
      I understand that some Swap can be used, but I don't understand why so much Swap, instead of resident RAM.

      Since the restart yesterday, it's already using 2GB swap, and increasing.

      Thank you.

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            People

            Assignee:
            danblack Daniel Black
            Reporter:
            nunop Nuno
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              Dates

              Created:
              Updated:
              Resolved:

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