Comment #8 on issue 198 by dorma...@rydia.net: Logs always empty http://code.google.com/p/memcached/issues/detail?id=198
-X was added in the 1.6 beta version, which is unreleased and trails the 1.4 track in some ways.
If you want logging in the current version, you need to start memcached with -vv and pipe to a file, or pipe to a "logger" process to send the data to syslog.
Sorry, it's not ideal :/
