Tibor Arpas wrote:
> I'm quite new to python and I ran into a performance problem with
> wsgiref.simple_server. I'm running this little program.
>
> from wsgiref import simple_server
>
> def app(environ, start_response):
> start_response('200 OK', [('content-type', 'text/html')])
> return ['*'*50000]
>
> httpd = simple_server.make_server('',8080,app)
> try:
> httpd.serve_forever()
> except KeyboardInterrupt:
> pass
>
>
> I get many hundreds of responses/second on my local computer, which is
> fine.
> But when I access this server through our VPN it performs very bad.
>
> I get 0.33 requests/second as compared to 7 responses/second when
> accessing 50kB static file served by IIS.
>
> I also tried the same little program using paste.httpserver and that
> version works fast as expected.
>
> I cannot really understand this behavior. My only thought is that the
> wsgiref version is sending the data in many chunks, and therefore the
> latency of the VPN comes into play. But I don't really know how to
> test this.
One possible answer is that wsgiref doesn't disable the Nagle algorithm
[1].
Try changing WSGIServer.server_bind to read:
def server_bind(self):
"""Override server_bind to store the server name."""
import socket
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY,
1)
HTTPServer.server_bind(self)
self.setup_environ()
Robert Brewer
[EMAIL PROTECTED]
[1] http://en.wikipedia.org/wiki/Nagle's_algorithm
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