I've had a look around on the system at what might be causing the
slowness of the wiki.

The number of used inodes was a bit high, so I ran some
maintenance tools on the wikis to reduce them.

A restart of Apache didn't help much. The processes went straight
to 100% again.

I then ran a log trace of the access log and found that the
wiki us being hit by massive and continuous stream of login attempts
and new account creations. I guess the spammers have us on the
radar again...

The IP addresses vary a lot, but the user agent strings are mostly
the same: "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64;
 Trident/5.0)".

All three wikis are affected, so this may be a botnet.

-- 
Marc-Andre Lemburg
eGenix.com

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