pmm-ras produces high CPU load

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  Unknown User September 27, 2018 16:45

  For those as confused as I was when researching the process pmm_ras process this a related thread is here in the forum -

  https://talk.plesk.com/threads/pmm-ras-wont-stop-until-its-killed.321434/

  Indicates this process is actually linked to Plesk migration manager.

  I'd recommend checking /var/log/plesk/PMM/migration.log to see what it's up-to, in my case the CPU load wasnt super high, but had been runnign for a while and that's what was suspect - however since this is linked to the backup process helps explain that this is most likely normal behaviour - in my case CPU wasnt as high as illustrated here but it was one of the top processes for many hours.

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  Alexandr Redikultsev September 28, 2018 00:16

  Hello!

  Thank you for sharing you experience.

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  ioweb.gr September 28, 2018 06:29

  I've had my share of this problem as well. While backup compression was active I had extremely high CPU that would prevent sites from loading. After switching it off I ended up with high I/O usage at periods which would slow them down. I'm on a powerful VPS however the CPU and DISK usage was very high. Even on a dedicated server the performance drop is noticeable while pmm-ras is running. I was told by support to monitor this thread here.

  I've added a suggestion in plesk uservoice regarding backup priorities which should help.

  https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/35027743-better-backup-priority-settings-to-include-nice-an

  I'm hoping more people will vote on that

  Currently I've had to use 3 separate cron jobs to lower the cpu and I/O priority of backups

  • pmm-ras 
  • pigz
  • tar

   

   

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  b_p October 15, 2020 01:44 (Edited October 15, 2020 01:45)

  Sorry, but the advice regarding hardware upgrades does not help with traditional hosting providers. Also, given the fact that only the Plesk version has changed (nothing else), it is rather Plesk that should be fixed! And btw, it would help if the cause is explained a bit more in detail... Any other workaround?

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  Anton Maslov October 16, 2020 23:09

  Since version 18.0.26 it is possible to define priority for the backup processes, please try to adjust settings under Tools & Settings > Backup Manager (under “Tools & Resources”), click “Settings.

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  b_p October 30, 2020 01:40

  Anton Maslov sad thing: I already did so and the problem appears even though the lowest possible priorities are already selected.

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