Hello Scott, Many many thanks for your guidance. I followed the binary search among modules and was quickly able to pinpoint mod_cband ( http://sourceforge.net/projects/cband/) as the reason of why the number of shared memory segments keeps increasing.
Again, many thanks to you and everyone who helped me out. Regards Chandranshu On Fri, Jun 26, 2009 at 8:36 PM, Scott Gifford <sgiff...@suspectclass.com>wrote: > "Chandranshu ." <chandran...@gmail.com> writes: > > > We changed our script that used to do a graceful restart to also > > record the number of shared memory segments before and after the > > restart. Plotting the number of shm segments vs. the number of times > > the server was restarted gracefully was almost a straight line. > > Hello Chandranshu, > > When you do a graceful server restart, Apache asks the children to > exit when it's convenient and starts up new children. So it would not > surprise me to see a short spike in resource consumption until the old > child processes complete. It would surprise me if it didn't return to > normal after a few minutes, though, and you're seeing the increased > shared memory segments until a server restart, right? And you suspect > it's a leak somewhere? > > A strategy for figuring out what's causing this would be to start off > with a minimal Apache configuration. You could create a new conf file > with all modules disabled listening on another port and look for the > leak there. If you still see it, it must be in the Apache core; > otherwise it's in a module. Keep enabling modules until you start > seeing it, then you know what module it is (you can also enable and > disable groups of modules to do a sort of binary search). If with the > same set of modules as your production server you still don't see a > leak, it must be some code running under your server, and you can use > the same sort of process to bring in different pieces of code until > you see the leak. > > Hope this helps, and good luck! > > ----Scott. > > --------------------------------------------------------------------- > The official User-To-User support forum of the Apache HTTP Server Project. > See <URL:http://httpd.apache.org/userslist.html> for more info. > To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org > " from the digest: users-digest-unsubscr...@httpd.apache.org > For additional commands, e-mail: users-h...@httpd.apache.org > >
