Re: [libmicrohttpd] Performance problem under Windows

[Martin Bisson]

Thanks for your answer.

On 09/02/2011 8:55 AM, Christian Grothoff wrote:
> Even 12ms is still a bit high -- could that be your Python script? ;-).

I don't think so, it is pretty straight forward...  But it might be!  I 
attached it to this e-mail just in case...

The 12ms server is something like a AMD-K6, 450 Mhz CPU, pretty old 
machine...  So I would gladly put the blame on that old thing! :)


> > I find the "little more than 1 second per request" a little suspicious.
> > I looked at the code in daemon.c and both the select() and the poll()
> > calls use a 1 second timeout...  I was wondering if there might be a
> > problem with that under Windows...?  Or is the 1 second per request an
> > expected latency for libmicrohttpd with client&  server on the same
> > computer?
> Well, I don't know how the 1s timeout in select relates to your performance
> issue (have you tried changing it to 10s and seeing if performance goes down
> accordingly), but what I can say is that MHD has no expected latency -- it
> should be "instant" (as far as your OS/hardware can deliver).
>
> Now, 0.4.5 is of course ancient and various issues have been introduced and
> fixed since (see ChangeLog), so I don't know if you're possibly hitting one of
> those.
>
> > Has anyone had this problem under Windows or can anyone point me to
> > solution path?
> I'd first try updating to the 0.9.x-series.  Nils Durner should know if a W32-
> binary exists for those already...
I guess my next step is to try to rebuild a more recent version of 
libmicrohttpd.  I didn't because I didn't have the proper setup under 
Windows.  I'm using Visual Studio 2010 for my application, so I created 
the import lib for the pre-built version of 0.4.5, but I guess I going 
to try to get a Cygwin build environment, with the proper dependencies 
(gcrypt & cie...?).

I'll see if this works, if not I guess I'll try to lower the timeout in 
select/poll.  I'm not familiar with debugging/stepping into code 
compiled with different compilers, but I guess I'll have to take a look 
into that!

If you can give me any pointers on what I'm going to attempt, please let 
me know.

Thanks again for your answer,

Mart

request.py
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