Hi,
This is not a python-specific problem. See
http://en.wikipedia.org/wiki/Nagle's_algorithm
-Mike
On 17-Apr-08, at 3:08 AM, Robert Hölzl wrote:
hello,
I tried to implement a simple python XMLRPC service on a win32
environment (client/server code inserted below).
The profiler of the client told me, that a simple function call
needs about 200ms (even if I run it in a loop, the time needed per
call stays the same).
After analysing the problem with etherreal I found out, that the
XMLRPC request is transmitted via two TCP packets. One containing
the HTTP header and one containting the data. But the acknowledge to
the first TCP packet is delayed by 200ms.
I tried around on the server side and found out that if the server
reads exactly all bytes transfered in the first TCP frame (via
socket.recv()), the next socket.recv(), even if reading only one
byte, needs about 200 ms. But if I read one byte less than
transfered in the first TCP frame and then reading 2 bytes
(socket.recv(2)) there is no delay, although the same total amount
of data was read.
After some googling I found the website http://support.microsoft.com/?scid=kb%3Ben-us%3B823764&x=12&y=15
, which proposed a workaround (modifing the registryentry for the
tcp/ip driver) that did work. But modifing the clients registry
settings is no option for us.
Is there anybody who nows how to solve the problem? Or is it even a
problem if the python socket implementation?
By the way: I testet Win2000 SP4 and WinXP SP2 with Python 2.3.3 and
Python 2.5.1 each.
CLIENT:
----------
import xmlrpclib
import profile
server = xmlrpclib.ServerProxy("http://server:80";)
profile.run('server.test(1,2)')
SERVER:
----------
import SimpleXMLRPCServer
def test(a,b): return a+b
server = SimpleXMLRPCServer.SimpleXMLRPCServer( ('', 80) )
server.register_function(test)
server.serve_forever()
--
Mit freundlichen Grüßen,
Best Regards,
Robert Hölzl
BALTECH AG
Firmensitz: Lilienthalstrasse 27, D-85399 Hallbergmoos
Registergericht: Amtsgericht München, HRB 115215
Vorstand: Jürgen Rösch (Vorsitzender), Martina M. Schuster
Aufsichtsratsvorsitzende: Eva Zeising
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