During peak load, PHP sporadically complains that it is unable to connect to my memcache server. I've taken a close look, and everything appears to be functioning fine, but the connection errors persist.
The memcache server shows a load of 0.5 or so, the traffic leaving the server is about 20MB/s, curr_connections is 1357. My question is, what would an overloaded memcache server look like? CPU, RAM and network connection are all underused (from what I can see), so why under high load is PHP (occasionally) unable to connect? People are also reporting "strange errors" during this time as well (blank pages, 503's), which I assume is from this memcache issue. Any help would be appreciated. Chris The exact PHP error is: [Thu Feb 26 12:57:31 2009] [error] [client xx.xx.xx.xx] PHP Warning: Memcache::pconnect() [<a href='function.Memcache- pconnect'>function.Memcache-pconnect</a>]: Can't connect to xx.xx.xx.xx:11211, Unknown error (0) in /path/to/lib/ lib_memcache.inc.php on line 121, referer: http://xxx/etc.
