安裝

一如既往，使用brew直接安裝

$brew info memcached memcached: stable 1.4.24 (bottled) High performance, distributed memory object caching system http://memcached.org/ Conflicts with: mysql-cluster Not installed From: https://github.com/Homebrew/homebrew/blob/master/Library/Formula/memcached.rb ==> Dependencies Required: libevent ? ==> Options --with-saslEnable SASL support -- disables ASCII protocol! --with-sasl-pwdbEnable SASL with memcached's own plain text password db support -- disables ASCII protocol! ==> Caveats To have launchd start memcached at login:ln -sfv /usr/local/opt/memcached/*.plist ~/Library/LaunchAgents Then to load memcached now:launchctl load ~/Library/LaunchAgents/homebrew.mxcl.memcached.plist Or, if you don't want/need launchctl, you can just run:/usr/local/opt/memcached/bin/memcached $ brew install memcached ==> Downloading https://homebrew.bintray.com/bottles/memcached-1.4.24.mavericks.bottle.tar.gz ######################################################################## 100.0% ==> Pouring memcached-1.4.24.mavericks.bottle.tar.gz ==> Caveats To have launchd start memcached at login:ln -sfv /usr/local/opt/memcached/*.plist ~/Library/LaunchAgents Then to load memcached now:launchctl load ~/Library/LaunchAgents/homebrew.mxcl.memcached.plist Or, if you don't want/need launchctl, you can just run:/usr/local/opt/memcached/bin/memcached ==> Summary �� /usr/local/Cellar/memcached/1.4.24: 10 files, 161.1K

測試

使用telnet測試：

啟動memcached:

輸入命令：
memcached -d -p 11211 -u nobody -c 1024 -m 64

直接使用telnet連接到memcached端口，輸入命令即可：

$ telnet localhost 11211Trying 127.0.0.1... Connected to localhost. Escape character is '^]'.

保存數據

輸入命令

set foo 0 0 3 bar

顯示STORED 表示成功。

數據讀取：

輸入命令

get foo

得到輸出：

VALUE foo 0 3 bar END

查看狀態

使用命令stat可以查看檢查memcached狀態

stat

得到輸出

STAT pid 3407 STAT uptime 111 STAT time 1452261936 STAT version 1.4.24 STAT libevent 2.0.22-stable STAT pointer_size 64 STAT rusage_user 0.002362 STAT rusage_system 0.003989 STAT curr_connections 10 STAT total_connections 11 STAT connection_structures 11 STAT reserved_fds 20 STAT cmd_get 1 STAT cmd_set 1 STAT cmd_flush 0 STAT cmd_touch 0 STAT get_hits 1 STAT get_misses 0 STAT delete_misses 0 STAT delete_hits 0 STAT incr_misses 0 STAT incr_hits 0 STAT decr_misses 0 STAT decr_hits 0 STAT cas_misses 0 STAT cas_hits 0 STAT cas_badval 0 STAT touch_hits 0 STAT touch_misses 0 STAT auth_cmds 0 STAT auth_errors 0 STAT bytes_read 42 STAT bytes_written 40 STAT limit_maxbytes 67108864 STAT accepting_conns 1 STAT listen_disabled_num 0 STAT threads 4 STAT conn_yields 0 STAT hash_power_level 16 STAT hash_bytes 524288 STAT hash_is_expanding 0 STAT malloc_fails 0 STAT bytes 71 STAT curr_items 1 STAT total_items 1 STAT expired_unfetched 0 STAT evicted_unfetched 0 STAT evictions 0 STAT reclaimed 0 STAT crawler_reclaimed 0 STAT crawler_items_checked 0 STAT lrutail_reflocked 0 END

結束telnet，輸入telnet退出命令：quit命令退出。

quit Connection closed by foreign host.

命令說明

memcached的簡單啟動命令

$ memcached -p 11211 -m 64m -d -vv

memcached啟動選項如下：

-p 使用的TCP端口，默認為11211 -m 最大內存大小默認為64m -vv 用very verbose模式啟動，調試信息和錯誤輸出到控制臺 -d 作為daemon在后臺啟動

查看memcached的詳細命令：

$ 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 specifya port number, the value you specified with -p or -U isused. You may specify multiple addresses separated by commaor 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 alimit on how much memory you may lock. Trying toallocate more than that would fail, so be sure youset the limit correctly for the user you startedthe 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). Increasingthe memory page size could reduce the number of TLB missesand improve the performance. In order to get large pagesfrom the OS, memcached will allocate the total item-cachein 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 collectionis turned on automatically; if not, then it may be turned onby 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 ofrequests process for a given connection to prevent starvation (default: 20) -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) -F Disable flush_all command -o Comma separated list of extended or experimental options- (EXPERIMENTAL) maxconns_fast: immediately close newconnections if over maxconns limit- hashpower: An integer multiplier for how large the hashtable 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 beforeforcefully taking over the LRU tail item whose refcount has leaked.Disabled by default; dangerous option.- hash_algorithm: The hash table algorithmdefault is jenkins hash. options: jenkins, murmur3- lru_crawler: Enable LRU Crawler background thread- lru_crawler_sleep: Microseconds to sleep between itemsdefault is 100.- lru_crawler_tocrawl: Max items to crawl per slab per rundefault 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)

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