XML-RPC(using SimpleXMLRPCServer) slow on the first call

Rafal Gulinski rafalgulinski at gmail.com
Thu Nov 5 17:17:23 CET 2009

On 14 Paź, 04:52, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Mon, 12 Oct 2009 18:58:45 -0300, Mahi Haile  
> <begin.middle.... at gmail.com> escribió:
> > Hello all,I have an xml-rpc server running on a machine in the same LAN  
> > as
> > the client. Both the server and the client are in Python.
> > When I have a series of xmlrepc calls from the client to the server, the
> > first call usually takes much longer than it should - orders of  
> > magnitude.
> > The latency is usually sub-10ms on the other calls, but the first call  
> > takes
> > up to 10 seconds or so. This are very simple functions, with almost no
> > computation.
> > Do you have any ideas?
> I doubt this is a Python problem. I'd look into the network: DNS  
> resolution, IPv6 (Windows XP has some timeout issues with IPv6 enabled).
> --
> Gabriel Genellina


I had quite similar issue and it was caused by some DNS settings. I
solved it by changing host name to host ip (f.e. for 'localhost' it
was ''). I hope it will help you.


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