$telnet ip_of_memcached_host 11211或$nc ip_of_memcached_host 11211

stats
STAT pid 117
...
STAT limit_maxbytes 67108864
....
STAT evictions 0
END

stats slabs
....
STAT total_malloced 30234456
END

或者使用喜欢的编程语言api for memcached