No time to discuss now. Read: http://blog.dscpl.com.au/2009/03/load-spikes-and-excessive-memory-usage.html
In short, don't use embedded/prefork MPM for WSGI application. Graham 2009/10/31 Leo Shklovskii <leo.shklovs...@gmail.com>: > I've got a strange problem that I've been trying to figure out over the past > few days with my mod_wsgi apache suddenly taking up 100% of memory and swap, > effectively > killing the server. > > The setup is: > Ubuntu Jaunty (fully updated) > nginx/0.6.35 serving static and proxying to: > Apache/2.2.11 (Ubuntu) > mod_wsgi > Python 2.6.2 > Django 1.1.1 > > Postgres/PostGIS DB on a different box > > This is running on a slicehost 512 slice. The application is fairly simple > and only gets ~200 real hits a day + the usual bot traffic. > > The workers config is set to: > <IfModule mpm_prefork_module> > StartServers 2 > MinSpareServers 2 > MaxSpareServers 5 > MaxClients 30 > MaxRequestsPerChild 300 > ServerLimit 30 > </IfModule> > > Several times over the past few days, I'll get an alarm that the time to > serve an http request has spiked (usually its .25 seconds) to 5 or 10 > seconds and looking at the munin monitoring reveals that the > swap has been completely filled: > > http://img687.imageshack.us/img687/7505/prod2memoryday.png > > Jumping on the machine and looking at top shows the apache completely > sucking > up all memory. Restarting it fixes the problem but I'd really love to be > able to figure out what's going on. > > There's nothing useful or out of the ordinary in syslog, apache_access and > absolutely nothing in apache_error. > > Has anyone else seen something like this before? or have suggestions on how > to figure out what the issue is? > > My current plan is to try and get a gcore when its in this wedged state and > see if I can figure out something with gdb, but I'm not quite sure how to do > that. > > Any thoughts or ideas from those who have more experience with this would be > very much appreciated! > > -- > --Leo > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "modwsgi" group. To post to this group, send email to modwsgi@googlegroups.com To unsubscribe from this group, send email to modwsgi+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/modwsgi?hl=en -~----------~----~----~----~------~----~------~--~---
