{"id":253,"date":"2013-12-31T22:28:23","date_gmt":"2013-12-31T13:28:23","guid":{"rendered":"http:\/\/tech.akat.info\/?p=253"},"modified":"2014-09-16T01:13:46","modified_gmt":"2014-09-15T16:13:46","slug":"memcached%e3%81%aetelnet%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/tech.akat.info\/?p=253","title":{"rendered":"memcached"},"content":{"rendered":"<h2>\u69cb\u9020<\/h2>\n<p>\u30fb\u30cf\u30c3\u30b7\u30e5\u5f62\u5f0f\u3067\u4efb\u610f\u306e\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58\u3059\u308b\u5206\u6563\u578bkey-value\u30b9\u30c8\u30a2<br \/>\n\u30fb\u30aa\u30f3\u30e1\u30e2\u30ea\u306e\u70ba\u9ad8\u901f\u306b\u52d5\u4f5c\u3057\u3001memcached\u306e\u518d\u8d77\u52d5\u3084OS\u306e\u518d\u8d77\u52d5\u6642\u306b\u30c7\u30fc\u30bf\u304c\u6d88\u3048\u308b<br \/>\n\u30fbLRU\uff08Least Recently Used\uff09\u306b\u57fa\u3065\u3044\u3066\u5229\u7528\u3055\u308c\u306a\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u81ea\u52d5\u7684\u306b\u524a\u9664\u3055\u308c\u308b<br \/>\n\u30fb\u5206\u6563\u306b\u5bfe\u3057\u3066\u306e\u5b9f\u88c5\u306f\u30b5\u30fc\u30d0\u306b\u306f\u5b9f\u88c5\u3055\u308c\u3066\u304a\u3089\u305a\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u3066\u5b9f\u88c5(Consistent Hashing\u53ef\u80fd)<br \/>\n\u30fbmemcached\u306f\u3001\u30c7\u30fc\u30bf\u3092slab\u3068\u3044\u3046\u9818\u57df\u306b\u308f\u3051\u3066\u30e1\u30e2\u30ea\u306e\u78ba\u4fdd\u3001\u7ba1\u7406\u3092\u5b9f\u65bd\u3059\u308b<br \/>\n(\u4ee5\u524d\u306f\u3001\u3059\u3079\u3066\u306e\u30ec\u30b3\u30fc\u30c9\u306b\u5bfe\u3057\u3066malloc\u3068free\u3092\u3057\u3001\u30e1\u30e2\u30ea\u306b\u30d5\u30e9\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u767a\u751f\u3057\u3001\u5927\u304d\u306a\u8ca0\u8377\u3068\u306a\u3063\u3066\u3044\u305f)<br \/>\n\u30fbslab\u306b\u3064\u3044\u3066\u3055\u307e\u3056\u307e\u306a\u5024\u304c\u7528\u610f\u3055\u308c\u3066\u304a\u308a\u3001\u4fdd\u5b58\u3055\u308c\u308b\u30c7\u30fc\u30bf\u306ebyte\u6570\u3088\u308a\u5927\u304d\u3044slab\u304c\u5229\u7528\u3055\u308c\u308b<br \/>\n\u305d\u306e\u305f\u3081\u3001\u540c\u3058byte\u6570\u306e\u30c7\u30fc\u30bf\u3070\u304b\u308a\u3067\u3042\u308b\u3068\u304d\u306f\u3001\u540c\u3058\u5927\u304d\u3055\u306eslab\u306e\u307f\u3092\u7528\u610f\u3059\u308b\u3053\u3068\u304c\u597d\u307e\u3057\u3044\u304c\u3001\u73fe\u72b6\u305d\u306e\u8a2d\u5b9a\u306f\u3067\u304d\u306a\u3044<br \/>\n(\u307b\u307c\u81ea\u52d5\u7684\u306bslab\u306e\u5024\u304c\u6c7a\u5b9a\u3059\u308b)<\/p>\n<h2>\u4f7f\u3044\u65b9<\/h2>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">\r\nroot@akat:\/home\/akat# lv \/usr\/share\/doc\/memcached\/protocol.txt.gz # \u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u8aac\u660e\r\nroot@akat:\/home\/akat# telnet localhost 11211\r\nTrying ::1...\r\nTrying 127.0.0.1...\r\nConnected to localhost.\r\nEscape character is '^]'.\r\nstats # \u7d71\u8a08\u60c5\u5831\u3092\u8868\u793a\r\nSTAT pid 12536\r\nSTAT uptime 123\r\nSTAT time 1388416705\r\nSTAT version 1.4.13\r\nSTAT libevent 2.0.19-stable\r\nSTAT pointer_size 64\r\nSTAT rusage_user 0.004000\r\nSTAT rusage_system 0.008000\r\nSTAT curr_connections 5\r\nSTAT total_connections 7\r\nSTAT connection_structures 6\r\nSTAT reserved_fds 20\r\nSTAT cmd_get 0\r\nSTAT cmd_set 0\r\nSTAT cmd_flush 0\r\nSTAT cmd_touch 0\r\nSTAT get_hits 0\r\nSTAT get_misses 0\r\nSTAT delete_misses 0\r\nSTAT delete_hits 0\r\nSTAT incr_misses 0\r\nSTAT incr_hits 0\r\nSTAT decr_misses 0\r\nSTAT decr_hits 0\r\nSTAT cas_misses 0\r\nSTAT cas_hits 0\r\nSTAT cas_badval 0\r\nSTAT touch_hits 0\r\nSTAT touch_misses 0\r\nSTAT auth_cmds 0\r\nSTAT auth_errors 0\r\nSTAT bytes_read 20\r\nSTAT bytes_written 1021\r\nSTAT limit_maxbytes 67108864\r\nSTAT accepting_conns 1\r\nSTAT listen_disabled_num 0\r\nSTAT threads 4\r\nSTAT conn_yields 0\r\nSTAT hash_power_level 16\r\nSTAT hash_bytes 524288\r\nSTAT hash_is_expanding 0\r\nSTAT expired_unfetched 0\r\nSTAT evicted_unfetched 0\r\nSTAT bytes 0\r\nSTAT curr_items 0 # \u73fe\u5728\u306eitem\u6570\r\nSTAT total_items 0\r\nSTAT evictions 0\r\nSTAT reclaimed 0\r\nEND\r\nset key 0 0 5 # set &lt;key&gt; &lt;flags&gt; &lt;exptime&gt; &lt;bytes&gt; \u3067\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\r\n# &lt;flags&gt;:\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u7279\u6709\u306e32bit\u306e\u5024\u3092\u6307\u5b9a\u3067\u304d\u3001\u30c7\u30fc\u30bf\u306e\u53d6\u5f97\u6642\u306b\u683c\u7d0d\u3057\u305f\u6642\u306e\u5024\u3092\u8fd4\u5374\u3059\u308b\r\n# &lt;exptime&gt;:\u30c7\u30fc\u30bf\u306e\u6709\u52b9\u671f\u9593\u3092\u79d2\u6570\u3067\u6307\u5b9a\u3059\u308b\u3002\u6307\u5b9a\u3057\u305f\u6642\u9593\u7d4c\u904e\u3059\u308b\u3068\u3001\u81ea\u52d5\u7684\u306b\u30ad\u30fc\u304c\u524a\u9664\u3055\u308c\u308b\u30020\u3067\u7121\u671f\u9650\u3067\u3042\u308b\u304c\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u91cf\u3067\u81ea\u52d5\u7684\u306b\u524a\u9664\u3055\u308c\u308b\u3053\u3068\u3082\u3002\r\nvalue\r\nSTORED\r\nget key # get\u3067\u30c7\u30fc\u30bf\u306e\u53d6\u5f97\r\nVALUE key 0 5\r\nvalue\r\nEND\r\nset key1 0 0 6\r\nvalue1\r\nSTORED\r\nappend key1 0 0 6 # \u30c7\u30fc\u30bf\u306e\u5f8c\u65b9\u8ffd\u52a0\r\nappend\r\nSTORED\r\nget key1\r\nVALUE key1 0 12\r\nvalue1append\r\nEND\r\nprepend key1 0 0 7 # \u30c7\u30fc\u30bf\u306e\u524d\u65b9\u8ffd\u52a0\r\nprepend\r\nSTORED\r\nget key1\r\nVALUE key1 0 19\r\nprependvalue1append\r\nEND\r\nstats items # slab\u60c5\u5831\u3092\u53d6\u5f97\r\nSTAT items:1:number 2 # items:x:\u2026\u3068\u306a\u3063\u3066\u304a\u308ax\u304cslab\u756a\u53f7\r\nSTAT items:1:age 3609\r\nSTAT items:1:evicted 0\r\nSTAT items:1:evicted_nonzero 0\r\nSTAT items:1:evicted_time 0\r\nSTAT items:1:outofmemory 0\r\nSTAT items:1:tailrepairs 0\r\nSTAT items:1:reclaimed 0\r\nSTAT items:1:expired_unfetched 0\r\nSTAT items:1:evicted_unfetched 0\r\nEND\r\nstats cachedump 1 10 # slab\u756a\u53f71\u306ekey\u30ea\u30b9\u30c8(10\u500b)\u3092\u53d6\u5f97\r\nITEM key &#x5B;5 b; 1388416582 s]\r\nITEM key1 &#x5B;19 b; 1388416582 s]\r\nEND\r\nadd key 0 0 5 # \u540c\u3058\u30ad\u30fc\u306e\u30c7\u30fc\u30bf\u304c\u30b9\u30c8\u30ec\u30fc\u30b8\u4e0a\u306b\u306a\u3044\u5834\u5408\u306e\u307f\u5024\u3092\u4fdd\u5b58\r\nvalue\r\nNOT_STORED\r\nreplace key 0 0 3 # \u540c\u3058\u30ad\u30fc\u306e\u30c7\u30fc\u30bf\u304c\u3059\u3067\u306b\u30b9\u30c8\u30ec\u30fc\u30b8\u4e0a\u306b\u3042\u3063\u305f\u5834\u5408\u306e\u307f\u5024\u3092\u4fdd\u5b58(set\u306f\u3069\u3093\u306a\u3068\u304d\u3082\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58)\r\nnew\r\nSTORED\r\nget key\r\nVALUE key 0 3\r\nnew\r\nEND\r\n\r\n<\/pre>\n<h2>memcached-tool<\/h2>\n<pre class=\"brush: plain; title: install; notranslate\" title=\"install\">\r\nroot@akat:\/usr\/local\/src# wget -d https:\/\/github.com\/memcached\/memcached\/archive\/master.zip\r\nroot@akat:\/usr\/local\/src# unzip master.zip\r\nroot@akat:\/usr\/local\/src# cd memcached-master\/scripts\/\r\nroot@akat:\/usr\/local\/src\/memcached-master\/scripts# .\/memcached-tool localhost:11211 display # slab\u306e\u5185\u5bb9\u3092\u8868\u793a\u3059\u308b\r\n  #  Item_Size  Max_age   Pages   Count   Full?  Evicted Evict_Time OOM\r\n  1      96B      4957s       1       2      no        0        0    0\r\nroot@akat:\/usr\/local\/src\/memcached-master\/scripts# .\/memcached-tool localhost:11211 dump # \u30c7\u30fc\u30bf\u306edump\r\nDumping memcache contents\r\n  Number of buckets: 1\r\n  Number of items  : 2\r\nDumping bucket 1 - 2 total items\r\nadd key1 0 1388416582 19\r\nprependvalue1append\r\nadd key 0 1388416582 5\r\nvalue\r\n<\/pre>\n<h2>\u305d\u306e\u4ed6<\/h2>\n<p>\u30fbexptime\u306b\u3064\u3044\u3066\u3001get\u3059\u308b\u969b\u306b\u30ec\u30b3\u30fc\u30c9\u306etimestamp\u3092\u898b\u308b\u3053\u3068\u3067\uff0c\u305d\u306e\u30ec\u30b3\u30fc\u30c9\u304cexpire\u3057\u305f\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u3001\u5185\u90e8\u7684\u306bexpire\u306e\u76e3\u8996\u3092\u3057\u3066\u304a\u3089\u305a\u3001\u7121\u99c4\u306a\u30ea\u30bd\u30fc\u30b9\u3092\u6d88\u8cbb\u3057\u306a\u3044<br \/>\n\u30fb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089get_multi\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u975e\u540c\u671f\u3067\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u306b\u884c\u304f\u305f\u3081\u3001get\u306efor\u6587\u3088\u308a\u3082\u65e9\u3044<br \/>\n\u30fbdelete\u30b3\u30de\u30f3\u30c9\u306b\u3064\u3044\u3066\u30011\u3064\u76ee\u306e\u5f15\u6570\u3067key\u3092\u6307\u5b9a\u3059\u308b\u304c\u30012\u3064\u76ee\u306e\u5f15\u6570\u3068\u3057\u3066\u6642\u9593\u3092\u4e0e\u3048\u308b\u3053\u3068\u3067\u4e00\u5b9a\u6642\u9593\u3001\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u3092\u540c\u3058\u30ad\u30fc\u3067\u4fdd\u5b58\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002(add\u3068replace\u3067\u306f\u3053\u306e\u9593\u4fdd\u5b58\u3067\u304d\u306a\u3044\u3002)\u30ad\u30e3\u30c3\u30b7\u30e5\u30c7\u30fc\u30bf\u306e\u4e0d\u6574\u5408\u3092\u9632\u3050<\/p>\n<h2>\u53c2\u8003<\/h2>\n<p>\u69cb\u9020<br \/>\nhttp:\/\/gihyo.jp\/dev\/feature\/01\/memcached<br \/>\n\u30b3\u30de\u30f3\u30c9<br \/>\nhttp:\/\/research.sakura.ad.jp\/2010\/03\/26\/kvs-memcached\/<br \/>\nmemcached-tool<br \/>\nhttp:\/\/taka512.hatenablog.com\/entry\/20110830\/1314698515<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u69cb\u9020 \u30fb\u30cf\u30c3\u30b7\u30e5\u5f62\u5f0f\u3067\u4efb\u610f\u306e\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58\u3059\u308b\u5206\u6563\u578bkey-value\u30b9\u30c8\u30a2 \u30fb\u30aa\u30f3\u30e1\u30e2\u30ea\u306e\u70ba\u9ad8\u901f\u306b\u52d5\u4f5c\u3057\u3001memcached\u306e\u518d\u8d77\u52d5\u3084OS\u306e\u518d\u8d77\u52d5\u6642\u306b\u30c7\u30fc\u30bf\u304c\u6d88\u3048\u308b \u30fbLRU\uff08Least Recently Used\uff09\u306b\u57fa [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[7],"tags":[],"_links":{"self":[{"href":"https:\/\/tech.akat.info\/index.php?rest_route=\/wp\/v2\/posts\/253"}],"collection":[{"href":"https:\/\/tech.akat.info\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tech.akat.info\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tech.akat.info\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tech.akat.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=253"}],"version-history":[{"count":11,"href":"https:\/\/tech.akat.info\/index.php?rest_route=\/wp\/v2\/posts\/253\/revisions"}],"predecessor-version":[{"id":264,"href":"https:\/\/tech.akat.info\/index.php?rest_route=\/wp\/v2\/posts\/253\/revisions\/264"}],"wp:attachment":[{"href":"https:\/\/tech.akat.info\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=253"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tech.akat.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=253"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tech.akat.info\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=253"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}