Memory usage in Zammad

Technical assistance
7

Hi @slavian87 - how many concurrent users (agents and customers) work in your Zammad simultaneously at peak time?

Our recommendation for 10 concurrent users and a smooth user experience is:

  • 6 CPUs
  • 12 GB RAM (because of the hungry ES)
  • Put /opt/zammad/tmp into a RAM-Disk (2-3 GB, keep an eye on it and extend if required)

For the application server:
https://docs.zammad.org/en/latest/appendix-configure-env-vars.html ->

zammad config:set WEB_CONCURRENCY=3
systemctl restart zammad

One scheduler instance is sufficient

To reduce the memory load of the Ruby processes you can set the Ruby specific ENV vars (as described above):

export RUBY_GC_MALLOC_LIMIT=1077216 RUBY_GC_MALLOC_LIMIT_MAX=2177216 RUBY_GC_OLDMALLOC_LIMIT=3000100 RUBY_GC_OLDMALLOC_LIMIT_MAX=4000100