High CPU Ruby Zammad


I am getting 100% CPU when running Zammad causing the server to be very slow.

Note that no other application is running beside Zammad.



If you are a Zammad Support or hosted customer and experience a technical issue, please refer to: support@zammad.com using your zammad-hostname / or company contract.

  • Used Zammad version:
  • Used Zammad installation source: (source, package, …)
  • Operating system:
  • Browser + version:

Expected behavior:

Actual behavior:

Steps to reproduce the behavior:

Please fill in the required information in the template you just skipped (e.g. Zammad-Version).
Also let us know what hardware specs you’re running Zammad on, meaning:

  • CPU cores (and speed)
  • guruanteed RAM of your server Zammad runs on/in
  • Storage (type e.g. SSD, HDD)

Another very useful information is what you’re doing in the moment the high cpu usuage appears (e.g. fetching many mails).

A production.log would be helpful as well.

CPU:24 cores

the CPU consumption is high even if there is no activity on Zammad

Please fill in the quoted information and provide a production log, other wise we can’t help you.

  • Used Zammad version: 2.6.x
  • Used Zammad installation source: (source, package, …): Source package
  • Operating system: CentOS 7
  • Browser + version: Chome Version 72.0.3626.119

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