--limit-memory-soft <limit>

Maximum allowed virtual memory per worker. If the limit is exceeded, the worker is killed and recycled at the end of the current request.

Defaults to 2048MB.

--limit-memory-hard <limit>

Hard limit on virtual memory, any worker exceeding the limit will be immediately killed without waiting for the end of the current request processing.

Did you see these resources:

https://www.odoo.com/documentation/11.0/reference/cmdline.html#reference-cmdline

https://www.odoo.com/documentation/11.0/setup/deploy.html#id5