[Web-SIG] how to test hunging socket ?
William Dode
wilk at flibuste.net
Fri Jan 30 22:48:04 CET 2009
On 30-01-2009, Ian Bicking wrote:
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> If you use the Paste HTTP server and Python 2.5 with ctypes installed, you
> can install the watchthreads app:
> http://svn.pythonpaste.org/Paste/trunk/paste/debug/watchthreads.py
>
> that will let you see the hung threads, and get a traceback of their curren=
> t
> position.
Fine, i should definitely give it a try.
If my app is not thread safe but respond in a decent time, can i benefit
from a multithread server (for a socket problem) if i use a lock for
every page like that :
I use webob...
lock = Lock()
def my_application(environ, start_response):
req = webob.Request(environ)
res = webob.Response()
res.content_type = 'text/html'
try:
lock.acquire()
# my app...
res.write('ok')
finally:
lock.release()
return res(environ, start_response)
>
> On Fri, Jan 30, 2009 at 1:52 PM, William Dode <wilk at flibuste.net> wrote:
>
>> Hi,
>>
>> I've a problem with a web app wich freeze periodicaly. I monitored my
>> app and the hang doesn't seem to occur in it. So i think the problem is
>> before, or after, a problem of socket i imagine... It append with
>> wsgiref.simple_server and mod_wsgi. My app is not totaly thread safe so
>> i didn't try a lot of servers...
>> When it freeze, i have to restart the app manualy. With mod_wsgi it
>> freeze the whole server. It doesn't append very often so it's difficult
>> for me to reproduce the problem.
>>
>> So my question is, how can i simulate hunging socket ? or how can i see
>> where the app freeze exactly ?
>>
>> In python-paste server i read the ian tried to handle some case of
>> hunging socket...
>>
>> thx, and sorry for my english...
>>
>> --
>> William Dod=C3=A9 - http://flibuste.net
>> Informaticien Ind=C3=A9pendant
>>
>> _______________________________________________
>> Web-SIG mailing list
>> Web-SIG at python.org
>> Web SIG: http://www.python.org/sigs/web-sig
>> Unsubscribe:
>> http://mail.python.org/mailman/options/web-sig/ianb%40colorstudy.com
>>
>
>
>
> --=20
> Ian Bicking | http://blog.ianbicking.org
>
> --0016364ee12abeaed40461b91b05
> Content-Type: text/html; charset=UTF-8
> Content-Transfer-Encoding: quoted-printable
>
> If you use the Paste HTTP server and Python 2.5 with ctypes installed, you =
> can install the watchthreads app: <a href=3D"http://svn.pythonpaste.org/Pas=
> te/trunk/paste/debug/watchthreads.py">http://svn.pythonpaste.org/Paste/trun=
> k/paste/debug/watchthreads.py</a><br>
><br>that will let you see the hung threads, and get a traceback of their cu=
> rrent position.<br><br><div class=3D"gmail_quote">On Fri, Jan 30, 2009 at 1=
>:52 PM, William Dode <span dir=3D"ltr"><<a href=3D"mailto:wilk at flibuste.=
> net">wilk at flibuste.net</a>></span> wrote:<br>
><blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
> 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi,<br>
><br>
> I've a problem with a web app wich freeze periodicaly. I monitored my<b=
> r>
> app and the hang doesn't seem to occur in it. So i think the problem is=
><br>
> before, or after, a problem of socket i imagine... It append with<br>
> wsgiref.simple_server and mod_wsgi. My app is not totaly thread safe so<br>
> i didn't try a lot of servers...<br>
> When it freeze, i have to restart the app manualy. With mod_wsgi it<br>
> freeze the whole server. It doesn't append very often so it's diffi=
> cult<br>
> for me to reproduce the problem.<br>
><br>
> So my question is, how can i simulate hunging socket ? or how can i see<br>
> where the app freeze exactly ?<br>
><br>
> In python-paste server i read the ian tried to handle some case of<br>
> hunging socket...<br>
><br>
> thx, and sorry for my english...<br>
><br>
> --<br>
> William Dod=C3=A9 - <a href=3D"http://flibuste.net" target=3D"_blank">http:=
> //flibuste.net</a><br>
> Informaticien Ind=C3=A9pendant<br>
><br>
> _______________________________________________<br>
> Web-SIG mailing list<br>
><a href=3D"mailto:Web-SIG at python.org">Web-SIG at python.org</a><br>
> Web SIG: <a href=3D"http://www.python.org/sigs/web-sig" target=3D"_blank">h=
> ttp://www.python.org/sigs/web-sig</a><br>
> Unsubscribe: <a href=3D"http://mail.python.org/mailman/options/web-sig/ianb=
> %40colorstudy.com" target=3D"_blank">http://mail.python.org/mailman/options=
> /web-sig/ianb%40colorstudy.com</a><br>
></blockquote></div><br><br clear=3D"all"><br>-- <br>Ian Bicking | &nb=
> sp;<a href=3D"http://blog.ianbicking.org">http://blog.ianbicking.org</a><br=
>>
>
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--
William Dodé - http://flibuste.net
Informaticien Indépendant
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