Ship in production

How run your websocket server in production ?

app/console gos:websocket:server --env=prod

Example with supervisord and other things will come

So why my memory increase all time ?

In development mode it's normal. (Don't bench memory leaks in this env, never) append your command with --env=prod
Are you using fingers_crossed handler with monolog ? If yes, switch to stream. That's fingers_crossed expected behavior. It stores log entries in memory until event of action_level occurs.
Dependencies of this bundle can have some troubles :( (But I can't do nothing, and if it's the case, downgrade or freeze impacted dependency)
It's your fault :) Dig in you own code.

app/console gos:websocket:server --profile --env=prod

And trigger all the things.