Meinheld is a high performance asynchronous WSGI Web Server (based on picoev)

$ pip install -U meinheld

$ python setup.py install

$ pip install -U gunicorn

from meinheld import server

def hello_world(environ, start_response):
    status = b'200 OK'
    res = b"Hello world!"
    response_headers = [('Content-type', 'text/plain'), ('Content-Length', str(len(res)))]
    start_response(status, response_headers)
    return [res]

server.listen(("0.0.0.0", 8000))
server.run(hello_world)

$ gunicorn --workers=2 --worker-class="egg:meinheld#gunicorn_worker" gunicorn_test:app

from meinheld import server
from meinheld import middleware

def app(environ, start_response):
    ...

    #get Continuation
    c = environ.get(middleware.CONTINUATION_KEY, None)

    ...

    if condtion:
        waiters.append(c)
        #suspend
        c.suspend()
    else:
        for c in waiters:
            # resume suspend function
            c.resume()

    ...


server.listen(("0.0.0.0", 8000))
server.run(middleware.ContinuationMiddleware(hello_world))

from flask import Flask, render_template, request
from meinheld import server, middleware

SECRET_KEY = 'development key'
DEBUG=True

app = Flask(__name__)
app.config.from_object(__name__)


participants = set()


@app.route('/')
def index():
    return render_template('websocket_chat.html')

@app.route('/chat')
def chat():
    print request.environ
    ws = request.environ.get('wsgi.websocket')
    participants.add(ws)
    try:
        while True:
            print "ws.wait()..."
            m = ws.wait()
            print "recv msg %s" % m
            if m is None:
                break
            for p in participants:
                print "send message %s" % m
                p.send(m)
    finally:
        participants.remove(ws)
    return ""


if __name__ == "__main__":
    server.listen(("0.0.0.0", 8000))
    server.run(middleware.WebSocketMiddleware(app))

from meinheld import patch
patch.patch_all()