[mod_python] Win32 threading issue

> are you using a multithreaded version of the python 
> interpreter?  If so,
> then that might be the cause of your problem.   Somewhere in 
> the mod_python
> documentation I read that apache would get confused if you used a
> multithreaded version of python.  Check that and please let 
> us (or at least
> me) know.

I think this is true for *nix, but on windows,
you *must* use a multithreaded python.

I'll try to have a look at your issue, but I've very
few time available these days.

-sbi

> -----Original Message-----
> From: mod_python-admin at modpython.org
> [mailto:mod_python-admin at modpython.org]On Behalf Of Marc Fiuczynski
> Sent: 07 May, 2001 11:42
> To: 'Chris Trengove'; mod_python at modpython.org
> Subject: RE: [mod_python] Win32 threading issue
> 
> 
> A random shot in the dark...
> 
> are you using a multithreaded version of the python 
> interpreter?  If so,
> then that might be the cause of your problem.   Somewhere in 
> the mod_python
> documentation I read that apache would get confused if you used a
> multithreaded version of python.  Check that and please let 
> us (or at least
> me) know.
> 
> In terms of throughput, you might also try writing a script 
> using "wget" to
> measure the number of requests per second you can run (not 
> sure what the
> windows equivalent is, or whether you can get it to work with cygwin).
> 
> Cheers,
> Marc
> 
> 
> > -----Original Message-----
> > From: Chris Trengove [mailto:trengove at econdata.com.au]
> > Sent: Saturday, May 05, 2001 10:08 PM
> > To: mod_python at modpython.org
> > Subject: [mod_python] Win32 threading issue
> > 
> > 
> > I have been testing the following script on Apache with 
> > mod_python (Apache
> > 1.13.17, mod_python 2.7.2, Windows 2000). I have been 
> > interested in testing
> > the possible throughput of this (and more useful scripts), so I have
> > another Python script which continually loads this "page".
> > 
> > from mod_python import apache
> > import thread
> > 
> > def handler(req):
> >     req.content_type = "text/plain"
> >     req.send_http_header()
> >     req.write("%d\n" % thread.get_ident())
> >     return apache.OK
> > 
> > When I run more than one copy of the driver script (in 
> > multiple consoles),
> > I get behavior indicative of some threading problems. 
> > Specifically, some
> > connections get "lost", the Apache error log reports various 
> > instances of
> > "IOError: Write failed...", and I occassionally get an access 
> > violation
> > inside Apache. Similarly, if I only run one copy of the 
> > driver script, and
> > just keep hitting the refresh button in a browser, the browser
> > occassionally returns TWO numbers, and sometimes reports an error in
> > retrieving the data. Note that I have tested my driver 
> > program retrieving a
> > simple text file, and everything works as expected, so it 
> > does not appear
> > to be a problem with Apache. (The problem also goes away if I set
> > ThreadPerChild to 1 in the Apache configuration.)
> > 
> > I have also found that, if I comment out the req.write() 
> > statement in the
> > handler, then there are no problems. From my examination of the
> > implementation of the request object, I see that req_write() 
> > contains calls
> > to Py_BEGIN_ALLOW_THREADS / Py_END_ALLOW_THREADS, whereas
> > req_send_http_header() contains no such calls. This suggests 
> > to me that
> > some thread switching is occurring inside req_write() which 
> > is messing with
> > the state of the interpreter.
> > 
> > I would be most grateful if anyone has any information to 
> > offer on this.
> > 
> > Chris Trengove
> > 
> > _______________________________________________
> > Mod_python mailing list
> > Mod_python at modpython.org
> > http://www.modpython.org/mailman/listinfo/mod_python
> > 
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