Gunicorn - WSGI server — Gunicorn 20.1.0 documentation

읽을 거리

• gunicorn deep dive https://medium.com/the-computer-engineer-weekly-code-challenge/ive-been-working-as-a-software-developer-for-almost-two-years-now-dealing-with-big-frameworks-5b35d0784943

Design

WSGI

Server Model

• pre-fork worker model 기반

  

  • pre-fork
    • master **process will do the WSGI initialization, then he will fork the workers.
    • is much less resource intensive (memory consumption, total startup time, time-to-spawn new worker)
  • http://zarnovican.github.io/2016/02/15/uwsgi-graceful-reload/
  • gunicorn 코드상에서 pre-fork

  def spawn_worker(self):
  	self.worker_age += 1
  	worker = self.worker_class(self.worker_age, self.pid, self.LISTENERS,
  	                           self.app, self.timeout / 2.0,
  	                           self.cfg, self.log)
  	self.cfg.pre_fork(self, worker)
  	pid = os.fork()
    ...
  

Master

• a central master process that manages a set of worker processes.
• master never knows anything about individual clients
• is a simple loop that listens for various process signals and reacts accordingly.

Sync Workers

• handles a single request at a time.