Memcached foundation 5

start-up

The following is a memcached Parameters of

[email protected] memcached-1.4.24# /usr/local/bin/memcached -h

memcached 1.4.24

-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

Copy

          a port number, the value you specified with -p or -U is

Copy

          used. You may specify multiple addresses separated by comma

Copy

          or by using -l multiple times

Copy

-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

Copy

          allocate more than that would fail, so be sure you

Copy

          set the limit correctly for the user you started

Copy

          the daemon with (not for -u <username> user;

Copy

          under sh this is done with 'ulimit -S -l NUM_KB').

Copy

-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

Copy

          and improve the performance. In order to get large pages

Copy

          from the OS, memcached will allocate the total item-cache

Copy

          in one large chunk.

Copy

-D <char> Use <char> as the delimiter between key prefixes and IDs.

          This is used for per-prefix stats reporting. The default is

Copy

          ":" (colon). If this option is specified, stats collection

Copy

          is turned on automatically; if not, then it may be turned on

Copy

          by sending the "stats detail on" command to the server.

Copy

-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 

Copy

          starvation (default: 20)

Copy

-C Disable use of CAS

-b 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)

Copy

-F Disable flush_all command

-o Comma separated list of extended or experimental options

          - (EXPERIMENTAL) 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)[email protected] memcached-1.4.24# 

Copy