Gunicorn states the following:
Gunicorn is based on the pre-fork worker model. This means that there is a central master process that manages a set of worker processes. The master never knows anything about individual clients. All requests and responses are handled completely by worker processes.
(http://docs.gunicorn.org/en/stable/design.html)
Yet, I cannot grasp the extent of this definition. I'd love to see a diagram, chart or anything that would visualise this concept/model.
Lets assume we have a folder that consists of a single file: wsgi.py
def app(environ, start_response):
data = b"Hello, World!\n"
start_response("200 OK", [
("Content-Type", "text/plain"),
("Content-Length", str(len(data)))
])
And run gunicorn with the following arguments:
gunicorn -w 2 wsgi:app
Thus:
If two workers are active and therefore each accepting a connection, does each process has its own wsgi.py instance ?
OR
If they share a common database or I/O operations, is it synchronised ?
P.S: I'd love to see references to articles concerning this topic !
