I have a really strange problem with my website. When I try to register an account for the blog, the whole website hangs. It eventually comes back, but it takes forever and you can't access the rest of the site as this happens.
We checked our APACHE processes as this happened and nothing seemed to be bloating. In fact, nothing seems to be wrong at all according to APACHE, but the whole site is inaccessible when this happens.
Some background info that may help:
- Our server is a virtual Rackspace cloud server
- We run APACHE, we're not expert Sys Admins and our settings may not be optimal
- We use W3 Total Cache: memecached, page cache, database cache, APC. Sometimes Varnish
- Something similar has happened in the past. We have an Event Manager plugin (http://wp-events-plugin.com) so that anonymous people can submit events. Once we got up to ~400 events, the server started hanging when people would submit. We eventually got around this by restarting httpd every once in a while. Not sure if this helps but thought it might be relevant.
Any help, clues, thoughts would be super appreciated. I'm very worried this has to do with the Event Manager problem and will become an issue as our season begins to ramp up again.