memcached -VERSION (return code: 0)
memcached -h (return code: 0)
memcached 1.4.33 -p <num> TCP port number to listen on (default: 11211) -U <num> UDP port number to listen on (default: 11211, 0 is off) -s <file> UNIX socket path to listen on (disables network support) -A enable ascii "shutdown" command -a <mask> access mask for UNIX socket, in octal (default: 0700) -l <addr> interface to listen on (default: INADDR_ANY, all addresses) <addr> may be specified as host:port. If you don't specify a port number, the value you specified with -p or -U is used. You may specify multiple addresses separated by comma or by using -l multiple times -d run as a daemon -r maximize core file limit -u <username> assume identity of <username> (only when run as root) -m <num> max memory to use for items in megabytes (default: 64 MB) -M return error on memory exhausted (rather than removing items) -c <num> max simultaneous connections (default: 1024) -k lock down all paged memory. Note that there is a limit on how much memory you may lock. Trying to allocate more than that would fail, so be sure you set the limit correctly for the user you started the daemon with (not for -u <username> user; under sh this is done with 'ulimit -S -l NUM_KB'). -v verbose (print errors/warnings while in event loop) -vv very verbose (also print client commands/reponses) -vvv extremely verbose (also print internal state transitions) -h print this help and exit -i print memcached and libevent license -V print version and exit -P <file> save PID in <file>, only used with -d option -f <factor> chunk size growth factor (default: 1.25) -n <bytes> minimum space allocated for key+value+flags (default: 48) -L Try to use large memory pages (if available). Increasing the memory page size could reduce the number of TLB misses and improve the performance. In order to get large pages from the OS, memcached will allocate the total item-cache in one large chunk. -D <char> Use <char> as the delimiter between key prefixes and IDs. This is used for per-prefix stats reporting. The default is ":" (colon). If this option is specified, stats collection is turned on automatically; if not, then it may be turned on by sending the "stats detail on" command to the server. -t <num> number of threads to use (default: 4) -R Maximum number of requests per event, limits the number of requests process for a given connection to prevent starvation (default: 20) -C Disable use of CAS -b <num> Set the backlog queue limit (default: 1024) -B Binding protocol - one of ascii, binary, or auto (default) -I Override the size of each slab page. Adjusts max item size (default: 1mb, min: 1k, max: 128m) -S Turn on Sasl authentication -F Disable flush_all command -o Comma separated list of extended or experimental options - maxconns_fast: immediately close new connections if over maxconns limit - hashpower: An integer multiplier for how large the hash table should be. Can be grown at runtime if not big enough. Set this based on "STAT hash_power_level" before a restart. - tail_repair_time: Time in seconds that indicates how long to wait before forcefully taking over the LRU tail item whose refcount has leaked. Disabled by default; dangerous option. - hash_algorithm: The hash table algorithm default is jenkins hash. options: jenkins, murmur3 - lru_crawler: Enable LRU Crawler background thread - lru_crawler_sleep: Microseconds to sleep between items default is 100. - lru_crawler_tocrawl: Max items to crawl per slab per run default is 0 (unlimited) - lru_maintainer: Enable new LRU system + background thread - hot_lru_pct: Pct of slab memory to reserve for hot lru. (requires lru_maintainer) - warm_lru_pct: Pct of slab memory to reserve for warm lru. (requires lru_maintainer) - expirezero_does_not_evict: Items set to not expire, will not evict. (requires lru_maintainer) - idle_timeout: Timeout for idle connections - (EXPERIMENTAL) slab_chunk_max: Maximum slab size. Do not change without extreme care. - watcher_logbuf_size: Size in kilobytes of per-watcher write buffer. - worker_logbuf_Size: Size in kilobytes of per-worker-thread buffer read by background thread. Which is then written to watchers. - modern: Enables 'modern' defaults. See release notes (highly recommended!). - track_sizes: Enable dynamic reports for 'stats sizes' command.