checkmk performance tuning

usually your checkmk site is becoming bigger and bigger .. this could lead to error messagen and performance issues if there are many services and hosts to be monitored

> use global fetcher and checker settings to optimize execution of checks. The
> settings can be found under Setup > General > Global settings:

> Use spearate fetchers and checkers should be on!

- fetchers:
they make the network communication, for example the snmp query or the query for the checkmk agent.
This query takes some time and uses about 30MB per process
Rule: increase that number, if you have enough free memory left on the server

- checker:
the checker processes are processing the collected data from the fetchers. A checker needs at least 90MB. Use only so many checkers as your machine has cores!
Rule: Use only so many checkers as your machine has cores!


### further reading
- https://docs.checkmk.com/latest/en/cmc_differences.html

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