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Nicolas Lehuen
nicolas at lehuen.com
Wed Feb 15 13:27:46 EST 2006
Marc, What did your custom Session code do ? Can you post it, so that we try and see what could cause the problem ? Regards, Nicolas 2006/2/15, Marc D. Murray <marcdm at phronein.com>: > Thank you all for Your tips and responses. > > > Is this server live on the internet or in a stand alone lab? > > Is it possible that there maybe a new virus attaching your machine > > when it connected to the net > It's live on the 'net. But I hope it's not a virus on Debian. Cuz I have > no anti-virus on any of my Debian Boxes :) > > > > And what do you get in error logs? Does it crash while processing your > > code or on directly in Apache? > > > > Where did you see DBNoMemory and who reported it? What drivers do you > > use and how do you handle db connections? > The DB Errors were from the bsddb.DBEnv runninng out of connections. > Not sure why this would happen as it was supposedly designed for many > connections. > But I'm currently using a global bsddb.DBEnv connection to a folder that > holds many *.bdb files. These are opened stuffed into a queue. The are > closed if older than 2 hrs. > I don't get these errors anymore. > > > > How does Apache behave WRT memory ? There are known memory leaks in > > mod_python version prior to 3.2.7, so > Each apache process hovers between 3.2 and 4.7 % (readin from top). I > ran some tests on my local server using /usr/sbin/ab, but it never went > down. Not even when requests set to 50000. > > > I would advise you to upgrade to 3.2.7 if you can > Now this is something I've been thinking of. I'll look into it later > tonite. > > > > > MaxRequestsPerChild 500 > > > > Make that 10000 or so. This low a number is only required if your > > system is leaking lots of resources (which mod_python does not do). > Now I'm confused. Does it leak or not? How do I test for that? > > > I've changed the config in the following way : > - AddHandler python-program py > + SetHandler mod_python > - PythonOption SessionDbm=blahblah > + lines to SetHandler = Default for *.(jpg|gif|png|html|txt) > > -MultiViews > KeepAlive On > KeepAliveTimout 300 > MaxKeepAlive 100 > > MaxRequestsPerChild 1000 > > This seems to solve the problem with errors I saw in the logs stating > [No Available Variant] > > Occationally, I see a 404 error in the logs pointing to the wrong > web-root. Actually it points to the only site on the server running > under mod_jk. Is there some sort of contention between the two? > > Actually, while writing this email I was checking the server and it > seems that I've solved the problem. > > I had a custom session object, that inherited from DBMSession. This was > done to implement some other actions at cleanup time. I commented out > the lines relating to the custom session, and replaced it with the > regular mod_python.Session. Seems to be working ok so far. > > I suspect it was either this or the MultiViews that was causing my > probs. > > Let's watch it and see what happens. > > Regards, > > Marc DM. > > On Wed, 2006-02-15 at 09:06 -0500, Marc D. Murray wrote: > > I just 'completed' an application (website) using mod_python. > > - I'm using the mod_python.publisher handler > > - Each page is a function in a module. > > - Apache config has MultiViews enabled > > - Apache/2.0.54 (Debian GNU/Linux) mod_python/3.1.3 Python/2.3.5 > > PHP/4.3.10-16 mod_ssl/2.0.54 OpenSSL/0r > > > > However, I'm having a problem where the server (Apache) goes down every > > 3 - 4 hours. > > > > At first, I was getting a DBNoMemory error every half hour. Then I > > started caching database look-ups using memcached. > > > > Site was still going down. Now, every hour or two, instead of 40 min. > > > > So now, I'm caching entire pages but it still going down. Every few > > hours. > > > > This is how I'm outputting pages : > > --> request comes in > > --> mod_python.publisher decides which module.function to execute > > --> function checks session variables and loads config from cache or > > *.conf file. > > --> generate cache_key as sitename:req.unparsed_uri:lang > > --> If item in cache, return cached paged > > --> generate page, insert into cache for 4 hrs --> return output. > > > > But I'm still being told by Apache that it has reached MaxClients every > > few hours. > > > > in /etc/apache2/apache.conf I have the following : > > > > KeepAlive Off > > Timeout 10 > > <IfModule prefork.c> > > StartServers 5 > > MinSpareServers 5 > > MaxSpareServers 10 > > MaxClients 80 > > MaxRequestsPerChild 500 > > </IfModule> > > > > Anyone see anything wrong with what's going on here? It's driving me > > crazy with this crashing, and I can't seem to find a solution. > > > > Thanks. > > > > Marc DM. > > > > PS. The server is the same one that used to run the same site in > > mod_mono. Except with mod_mono the server would climb to 32%cpu and stay > > there or climb higher. With mod_python, it never passes 4% Apache Dies. > > Why? > > > > > > _______________________________________________ > > Mod_python mailing list > > Mod_python at modpython.org > > http://mailman.modpython.org/mailman/listinfo/mod_python > > > > _______________________________________________ > Mod_python mailing list > Mod_python at modpython.org > http://mailman.modpython.org/mailman/listinfo/mod_python >
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