Non-blocking concurrent wsgi server

I am trying to be able to respond incoming web requests simultaneously, while processing of a request includes quite long IO call. I'm going to use gevent, as it's supposed to be "non-blocking" The problem I found is that requests are processed sequentially even though I have a lot of gevent threads. For some reason requests get served by single green thread. I have nginx (with default config which isn't relevant here I think), also I have uwsgi and simple wsgi app that emulates IO-blocking call as gevent.sleep(). Here they are: uwsgi.ini ``` [uwsgi] chdir = /srv/website home = /srv/website/env module = wsgi:app socket = /tmp/uwsgi_mead.sock #daemonize = /data/work/zx900/mob-effect.mead/logs/uwsgi.log processes = 1 gevent = 100 gevent-monkey-patch ``` wsgi.py ``` import gevent import time from flask import Flask app = Flask(__name__) @app.route("/") def hello(): t0 = time.time() gevent.sleep(10.0) t1 = time.time() return "{1} - {0} = {2}".format(t0, t1, t1 - t0) ``` then I simultaneously (almost) open two tabs in my browser, and here is what I get as result: ``` 1392297388.98 - 1392297378.98 = 10.0021491051 # first tab, processing finished at 1392297378.98 1392297398.99 - 1392297388.99 = 10.0081849098 # second tab, processing started at 1392297398.99 ``` As you can see, first call blocked execution of the view. What did I wrong?