I just stumbled onto an excellent article about how to examine memcached instances using ptrace and peep. It gets really interesting when he starts pulling the peep --ugly output into mysql and pouring over histograms.
All you folks that have asked how to see list all the keys and such in a memcached instance should give this a look see. http://blog.evanweaver.com/articles/2009/04/20/peeping-into-memcached/ -Ray
