[Web-SIG] Fwd: wsgiref.simple_server slow on slow network

[Robert Brewer]

A tcpdump would be more helpful at this point, but I'm not sure the ML
is the right place for that.


Robert Brewer
fumanchu at aminus.org


> -----Original Message-----
> From: web-sig-bounces+fumanchu=aminus.org at python.org [mailto:web-sig-
> bounces+fumanchu=aminus.org at python.org] On Behalf Of Tibor Arpas
> Sent: Tuesday, July 22, 2008 8:51 AM
> To: Jean-Paul Calderone
> Cc: web-sig at python.org
> Subject: Re: [Web-SIG] Fwd: wsgiref.simple_server slow on slow network
> 
> Mhm.. No, That doesn't seem to be THE reason. Paste is HTTP/1.0 too.
> See the detailed server-client communication below.  BTW the VPN is
> not that slow. It's 4Mb/s with pings of 5-7 ms. Thanks guys for the
> suggestions, I appreciate it. If you run out of them, the most
> effective way would probably be to strip down the script even further
> and use the underlying lower level libraries directly. I'll try to get
> back to it later once I have more time...
> 
> Benchmarking 10.0.0.230 (be patient)...INFO: POST header ==
> ---
> GET / HTTP/1.0
> Host: 10.0.0.230:8079
> User-Agent: ApacheBench/2.3
> Accept: */*
> 
> 
> ---
> LOG: header received:
> HTTP/1.0 200 OK
> Server: PasteWSGIServer/0.5 Python/2.5.1
> Date: Tue, 22 Jul 2008 15:36:53 GMT
> content-type: text/html
> Content-Length: 1
> 
> *
> LOG: Response code = 200
> ..done
> 
> ===================================================================
> Benchmarking 10.0.0.230 (be patient)...INFO: POST header ==
> ---
> GET / HTTP/1.0
> Host: 10.0.0.230:8078
> User-Agent: ApacheBench/2.3
> Accept: */*
> 
> 
> ---
> LOG: header received:
> HTTP/1.0 200 OK
> 
> LOG: header received:
> HTTP/1.0 200 OK
> Date: Tue, 22 Jul 2008 15:33:57 GMT
> Server: WSGIServer/0.1 Python/2.5.1
> content-type: text/html
> Content-Length: 1
> 
> *
> LOG: Response code = 200
> ..done
> 
> 
> On Tue, Jul 22, 2008 at 3:54 PM, Jean-Paul Calderone
> <exarkun at divmod.com> wrote:
> > On Tue, 22 Jul 2008 09:58:06 +0200, Tibor Arpas <tibor at infinit.sk>
> wrote:
> >>
> >> I added the Content-Length and no difference. Important thing I
> >> noticed is that I get the same request/response rate with only ONE
> >> byte of content. So it looks like a constant delay of 3 seconds per
> >> request..
> >
> > wsgiref seems to run an HTTP 1.0 server without persistent
> connections.
> > Perhaps paste is running an HTTP server with persistent connections.
> > High latency will tank performance of TCP connections.
> >
> > Jean-Paul
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