How to test Max Open Websocket Limit on Tornado server (Python)

I am trying to get the Maximum number of open connections to a websockets server. I have simple code in Python. which give me 28K open connection, but I think there might be something wrong in the server or client code.

Server.py

#!/usr/bin/env python

import tornado.httpserver
import tornado.websocket
import tornado.ioloop
import tornado.web

class WSHandler(tornado.websocket.WebSocketHandler):
    clients = []

    def open(self):
        self.clients.append(self)
        print 'new connection'
        self.write_message("Hello World")

    def on_message(self, message):
        print 'message received %s' % message

    def on_close(self):
        #self.clients.remove(self)
        pass
        #print 'closed connection'

application = tornado.web.Application([
    (r'/ws', WSHandler),
])


if __name__ == "__main__":
    http_server = tornado.httpserver.HTTPServer(application,no_keep_alive=False)
    http_server.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

      

        
        
        
      

    

Customer

#!/usr/bin/env python

"""
Connect websockets in concurrency, 
each connection should be open until last connection made and 
server did not response 
"""

import sys
import gevent
from gevent import monkey
from websocket import create_connection



#------------
# Functions 
#------------
def send_hello(n):
    my_count = 0
    while True:
        ws = create_connection(ws_link)
        ws.send("Hello World")
        recv = ws.recv()
        if recv:
           print "-----------------------"
           print "I'm Connection : %r" % n
           print "Sending 'Hello World'"
           print "Received : %s" % recv
           my_count = my_count + 1 
           #ws.close()  # Do not close the connections,
                     # Let see how much server can handle.. 
           print "I've sent %r messeges to server" % my_count
           print "-----------------------"


if __name__ == '__main__':
    if len(sys.argv) != 3:
        print "\nUsage:\n\t %r <ws_link> <number_of_connection>\n" % sys.argv[0]
        sys.exit(1) 
    ws_link, number_of_connections = sys.argv[1:]
    # patches stdlib to cooperate with other greenlets
    #monkey.patch_thread()
    try:
       monkey.patch_all()
       jobs = [ gevent.spawn(send_hello,i) for i in range(int(number_of_connections)) ]
       gevent.wait(jobs)
    except Exception as e:
       print "Error : %r" % e
       sys.exit(1)