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Scaling Memcache at Facebook | USENIX
by Michael Piatek Responsiveness is essential for web services. Speed drives user engagement, which drives revenue. To reduce response latency, modern web services are architected to serve as much as possible from in-memory caches. The structure is familiar: a database is split among servers with caches for scaling reads. Over time, caches tends to accumulate more responsibility in the storage sta
memcached ãŠã™ã™ã‚起動オプションã¾ã¨ã‚ - blog.nomadscafe.jp
ã“ã“を書ãç›´ã—ã¦è»¢è¼‰ memcachedã«é–¢ã™ã‚‹è¨˜äº‹ã¯ã€Œç¬¬1回　memcachedã®åŸºæœ¬ï¼šmemcachedを知り尽ãã™ï½œgihyo.jp … 技術評論社ã€ãªã©ä½•å›žã‹æ›¸ã„ã¦ã„ã¾ã™ãŒã€æœ€è¿‘ã®memcachedã§ã®èµ·å‹•ã‚ªãƒ—ションã®ãŠã™ã™ã‚ã‚’ã¾ã¨ã‚ã¦ã¿ã‚ˆã†ã¨æ€ã„ã¾ã™ã€‚ãªãŠã“ã®è¨˜äº‹ã¯Memcached Advent Calendarã§ã¯ã‚ã‚Šã¾ã›ã‚“。 ã¾ã¨ã‚ã‚‹ã¨ã“ã‚“ãªæ„Ÿã˜ã§ã™ã€‚ $ memcached -v -p 11211 -U 0 -u memcached -m 1024 \ -c 100000 -t 4 -C -B ascii ã²ã¨ã¤ãšã¤ç°¡å˜ã«ç´¹ä»‹ã—ã¾ã™ã€‚ -v ãƒã‚°å‡ºåŠ› ãƒã‚°ã‚’ verbose モードã§èµ·å‹•ã—ã¾ã™ã€‚エラーやè¦å‘ŠãŒè¡¨ç¤ºã•ã‚Œã¾ã™ã€‚弊社ã§ã¯memachedã‚’daemontools経由ã§èµ·å‹•ã—ã€ãƒã‚°ã‚’記録ã—ã¦ã„ã¾ã™ã€‚ -v -vオプション㯠-vvã€-vvv 㨠v ã®æ•°ã‚’増やã™äº‹ã§
Cache::Memcached(::Fast) ã®ãƒãƒ¼ãƒ スペースã¯æœ€å¾Œã«åŒºåˆ‡ã‚Šæ–‡å—ã‚’ã„ã‚ŒãŸæ–¹ãŒè‰¯ã„話ã¨ãƒãƒ¼ãƒ スペース毎ã«çµ±è¨ˆã‚’å–る方法 - blog.nomadscafe.jp
Cache::Memcached(::Fast) ã®ã‚ªãƒ—ションã«ã¯ namespace ã¨ã„ã†ã®ãŒã‚ã‚Šã¾ã™ã€‚ https://metacpan.org/module/Cache::Memcached::Fast https://metacpan.org/module/Cache::Memcached Cache::Memcachedã€Cache::Memcached::Fastã€ã©ã¡ã‚‰ã‚‚namespaceã¯ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ä½œæˆæ™‚ã«æŒ‡å®šã—ã¦ã€ã‚ã¨ã‹ã‚‰å¤‰æ›´ã™ã‚‹ã“ã¨ã¯å‡ºæ¥ã¾ã›ã‚“。 my $s = Cache::Memcached::Fast->new({ servers => [qw/127.0.0.1:11211/], namespace => 'myservice' }); namespaceを使ã†ã¨ã€ã²ã¨ã¤ã®memcachedサーãƒã‚’複数ã®ã‚¢ãƒ—リケーションã‹ã‚‰ä½¿ç”¨ã™ã‚‹å ´åˆãªã©ã«ã€ãã‚Œãžã‚Œåˆ¥ã®ãƒ
MySQL5.6ã®æ–°æ©Ÿèƒ½ã€ŒInnoDB Memcached Pluginã€ã®åˆ†é›¢ãƒ¬ãƒ™ãƒ«ã‚’検証ã—ã€ã‚½ãƒ¼ã‚·ãƒ£ãƒ«ã‚²ãƒ¼ãƒ 案件ã«ä½¿ãˆãã†ã‹æ¤œè¨¼ã—ã¦ã¿ã¾ã—ãŸï½œæŠ€è¡“ブãƒã‚°ï½œåŒ—æµ·é“æœå¹Œå¸‚・宮城県仙å°å¸‚ã®VR・ゲーム・システム開発 インフィニットループ
ホーム技術ブãƒã‚° MySQL5.6ã®æ–°æ©Ÿèƒ½ã€ŒInnoDB Memcached Pluginã€ã®åˆ†é›¢ãƒ¬ãƒ™ãƒ«ã‚’検証ã—ã€ã‚½ãƒ¼ã‚·ãƒ£ãƒ«ã‚²ãƒ¼ãƒ 案件ã«ä½¿ãˆãã†ã‹æ¤œè¨¼ã—ã¦ã¿ã¾ã—㟠MySQL5.6ã®æ–°æ©Ÿèƒ½ã€ŒInnoDB Memcached Pluginã€ã®åˆ†é›¢ãƒ¬ãƒ™ãƒ«ã‚’検証ã—ã€ã‚½ãƒ¼ã‚·ãƒ£ãƒ«ã‚²ãƒ¼ãƒ 案件ã«ä½¿ãˆãã†ã‹æ¤œè¨¼ã—ã¦ã¿ã¾ã—㟠matsuiã§ã™ã€‚ 先日6/1ã«è¡Œã‚ã‚ŒãŸç¬¬å››å›žæœå¹ŒMySQL勉強会ã®ä¸ã§ã€MySQL5.6ã®æ–°æ©Ÿèƒ½ã€ŒInnoDB Memcached Pluginã€ã®åˆ†é›¢ãƒ¬ãƒ™ãƒ«ã«ã¤ã„ã¦èª¿ã¹ã¦ã¿ã¾ã—ãŸã®ã§ã€è¨˜äº‹ã«ã—ã¦ã¿ãŸã„ã¨æ€ã„ã¾ã™ã€‚ InnoDB Memcached Pluginã¨ã¯ 「InnoDB Memcached Pluginã€ã¨ã¯ã€MySQL5.6ã‹ã‚‰ä½¿ãˆã‚‹ã‚ˆã†ã«ãªã£ãŸã€SQLを使ã‚ãšMemcachedプãƒãƒˆã‚³ãƒ«ã‚’使ã£ã¦InnoDBã®ãƒ‡ãƒ¼ã‚¿ã«ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹ãŸã‚ã®ã‚‚ã®ã§ã™ã€‚ 主ãªãƒ¡ãƒªãƒƒãƒˆã¯ãã®é«˜
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Etsy Engineering | mctop - a tool for analyzing memcache get traffic
Here at Etsy we (ab)use our memcache infrastructure pretty heavily as a caching layer between our applications and our database tiers. We functionally partition our memcache instances into small pools and overall it works fabulously well. We have however suffered occasionally from what we call "hot keys". What is a "Hot" key? A "hot key" is a single key hashed to an individual memcache instance wi
僕らãŒmemcachedã®ã‚ャッシュã‚ーã«sha1ã‚„md5ã®hash値を使ã†ã‚’é¿ã‘ã‚‹ç†ç”± - blog.nomadscafe.jp
memcachedã®ã‚ャッシュã‚ーã«sha1ã‚„md5ã®hash値を使ã†ã¨tcpdumpや解æžãƒ„ールã§è¦—ãã«ãããªã‚‹ã®ã§ã€cacheã«ã¯å‡ºæ¥ã‚‹ã ã‘ã‚ã‹ã‚Šã‚„ã™ã„åå‰ã‚’ã¤ã‘ã¦ä¸‹ã•ã„。ã¨ã„ã†ãƒãƒŠã‚· 下ã®ã‚ˆã†ãªã‚³ãƒ¼ãƒ‰ã®ã‚ˆã†ã« sub cache { state $cache = Cache::Memcached::Fast->new({ namespace => 'db:', }); } sub key { my ($self,$key) = @_; sha1_hex($key); } sub cached_member { my ($self, $member_id) = @_; my $key = $self->key('member:'.$member_id); my $member = $self->cache->get($key); if ( !$member ) { #DBã‹ã‚‰å–å¾— }
pixivã®ãƒ‡ãƒ¼ã‚¿ã‚¹ãƒˆã‚¢/ã‚ャッシュ戦略 ãã®3 - pixiv engineering blog
HHKB Professional Type-SãŒæ¬²ã—ã„インフラ兼ソフトウェアエンジニアã®bokkoã§ã™ã€‚ 普段ã¯HHKB Proã®æ—¥æœ¬èªžé…列ã‚ーボードを愛用ã—ã¦ã„ã¾ã™ã€‚英語é…列ã¯è‹¦æ‰‹ã§ã™ã€‚ã“ã®ã“ã¨ã‚’åŒåƒšã®ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã«è¨€ã†ã¨ã‚¸ãƒˆç›®ã§è¦‹ã¤ã‚られ・・・ç¨ã¿ã¤ã‘られるã“ã¨è«‹ã‘åˆã„ã§ã™ã€‚ 本連載ã®æœ€å¾Œã¨ãªã‚‹ä»Šå›žã¯pixivã®ãƒ‡ãƒ¼ã‚¿ã‚¹ãƒˆã‚¢/ã‚ャッシュ戦略を支ãˆã‚‹å‘¨è¾ºãƒŸãƒ‰ãƒ«ã‚¦ã‚§ã‚¢ã«ã¤ã„ã¦è§£èª¬ã—ã¦ã„ãã¾ã™ã€‚ memcachedã‹ã‚‰KyotoTycoonã¸ç§»è¡Œã—ãŸéš›ã«ç™ºç”Ÿã—ãŸå•é¡Œ å‰å›žã®è¨˜äº‹ã®æœ€å¾Œã«ã‚‚ã‚ã£ãŸã‚ˆã†ã«pixivã§ã¯APã®æ•°ã ã‘ã‚ã£ãŸmemcachedã¸ã®ãƒªã‚¯ã‚¨ã‚¹ãƒˆã‚’å°‘æ•°ã®KyotoTycoonã«ã¾ã¨ã‚ãŸã“ã¨ã§ä¸€éƒ¨ã®KyotoTycoonサーãƒã¸ã®TCPコãƒã‚¯ã‚·ãƒ§ãƒ³æ•°ãŒçˆ†ç™ºã—ã¦KyotoTycoonサーãƒã®CPUやメモリリソースã«ã¯ä½™è£•ãŒã‚ã‚‹ã®ã«ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã§è©°ã¾ã‚‹ã¨ã„ã†å•é¡ŒãŒèµ·ã“ã‚Šã¾ã—ãŸã€‚ å…ƒ
memcached-1.4.7-rc1ã§mixiã®å¤§è¦æ¨¡éšœå®³ã®åŽŸå› ã¨ãªã£ãŸmemcachedã®ä¸å…·åˆãŒå…¨ã¦è§£æ¶ˆã•ã‚Œã¾ã—㟠- blog.nomadscafe.jp
ã“ã¡ã‚‰ã¨ã“ã¡ã‚‰ã®ã‚¨ãƒ³ãƒˆãƒªãƒ¼ã®ç¶šã memcached 1.4.6ã§mixiã®éšœå®³ã®åŽŸå› ã¨ãªã£ãŸaccept_new_connsãŒã‚¹ãƒ¬ãƒƒãƒ‰ã‚»ãƒ¼ãƒ•ã˜ã‚ƒãªã„件ã¯ä¿®æ£ã•ã‚Œã¦ã„ã‚‹ã¯ãšã ã£ãŸã®ã§ã™ãŒã€æ¤œè¨¼ã—ãŸã¨ã“ã‚別ã®ã‚¹ãƒ¬ãƒƒãƒ‰ç«¶åˆã«ã‚ˆã‚‹ä¸å…·åˆãŒç™ºç”Ÿã—ã€Bugã¯å…¨ã¦è§£æ¶ˆã•ã‚Œã¦ã¯ã„ã¾ã›ã‚“ã§ã—ãŸã€‚ ã“ã®ä»¶ã«ã¤ã„ã¦mixiãŸã‚“ã½ã½Gã®æ£®æœ¬ã•ã‚“ã¨èª¿æŸ»ã—ã¦ã„ãŸã¨ã“ã‚ã€memcachedã®commiterã«twitter上ã§è£œè¶³ã•ã‚Œã€ã¤ãŸãªã„英語ã§å ±å‘Šã‚’ã‚ã’ã¦ã„ãŸã‚‰1.4.7-rc1ã§ä¿®æ£ã•ã‚ŒãŸã®ã§ãã®å ±å‘Šã€‚ memcached 1.4.6ã§ã®ä¸å…·åˆå†ç¾æ–¹æ³• ã¾ãšã€1.4.6ã§ä¸å…·åˆã‚’å†ç¾ã•ã›ã‚‹æ–¹æ³•ã«ã¤ã„ã¦ã€‚mixiã®ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ãƒ–ãƒã‚°ã¨åŒã˜ã‚ˆã†ã«ã€memcachedã¯æ¬¡ã®ã‚ªãƒ—ションã§èµ·å‹•ã—〠$ ./memcached -U 0 -u nobody -p 11222 -t 4 -m 16000 -C -c 1000
memcachedã®accept_new_connsãŒã‚¹ãƒ¬ãƒƒãƒ‰ã‚»ãƒ¼ãƒ•ã˜ã‚ƒãªã„件ãŒmemcached-1.4.6ã§ä¿®æ£ã•ã‚ŒãŸã«ã‚‡ - mixi engineer blog
ã“ã‚“ã«ã¡ã¯ã€ãŸã‚“ã½ã½Gã®æ£®æœ¬ã§ã™ memcached-1.4.6ãŒãƒªãƒªãƒ¼ã‚¹ã•ã‚Œã¾ã—ãŸã€‚ mixi大è¦æ¨¡éšœå®³ã®åŽŸå› ã¨ãªã£ãŸä¸å…·åˆãŒè§£æ¶ˆã•ã‚Œã¦ã„ã‚‹ã¨ã®ã“ã¨ãªã®ã§æ¤œè¨¼ã—ã¦ã¿ã¾ã—ãŸã€‚ å‹•ä½œç¢ºèª éŽåŽ»ã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã§ä¸å…·åˆãŒç™ºç”Ÿã™ã‚‹ã“ã¨ã¨æ–°ã—ã„ãƒãƒ¼ã‚¸ãƒ§ãƒ³(1.4.6)ã§ä¸å…·åˆãŒç™ºç”Ÿã—ãªã„ã“ã¨ã‚’確èªã™ã‚‹ãŸã‚ã« è² è·ãƒ†ã‚¹ãƒˆã‚’è¡Œã„ã¾ã—ãŸã€‚ memcachedã®è¨å®šã¯ memcached -U 0 -u nobody -p 11222 -t 4 -m 16000 -C -c 1000 -v ã¨ã—ã¾ã—ãŸã€‚ -l オプションを指定ã—ã¦ã„ãªã„ã®ã§ eth0, lo ã®äºŒã¤ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯I/Fã«å¯¾ã—ã¦listenã‚’è¡Œã†è¨å®šã§ã™ã€‚ クライアントå´ã®ã‚¹ã‚¯ãƒªãƒ—トã¯å‰å›žã¨åŒæ§˜ã«malaã•ã‚“作ã®ãƒ†ã‚¹ãƒˆã‚¹ã‚¯ãƒªãƒ—トを用ã„ã¾ã—ãŸã€‚ ./memcachedos.pl localhost 11222 5 memcached-1.4.4ã®
memcachedã®incr/decrãŒã‚¹ãƒ¬ãƒƒãƒ‰ã‚»ãƒ¼ãƒ•ã˜ã‚ƒãªã„件ãŒmemcached-1.4.6ã§ä¿®æ£ã•ã‚ŒãŸã«ã‚‡ - blog.nomadscafe.jp
以å‰ã€ã“ã“ã«æ›¸ã„ã¦ã„ãŸã€memcachedã®incrãŒã‚¹ãƒ¬ãƒƒãƒ‰ã‚»ãƒ¼ãƒ•ã§ã¯ãªãã€ç•ªå·ãŒã‚ºãƒ¬ã‚‹ã“ã¨ãŒã‚る件㌠1.4.6 ã§ä¿®æ£ã•ã‚ŒãŸã‚ˆã†ãªã®ã§æ¤œè¨¼ã—ã¦ã¿ãŸã€‚ memcached-1.4.6ã®ãƒ€ã‚¦ãƒ³ãƒãƒ¼ãƒ‰ã¯ã€memcached.org ã‹ã‚‰ リリースノート http://code.google.com/p/memcached/wiki/ReleaseNotes146 検証ã«ä½¿ã†scriptã¯ä»¥ä¸‹ã€‚ use Cache::Memcached::Fast; use Parallel::ForkManager; my $i=0; while(1) { $i++; my $memcached = Cache::Memcached::Fast->new({ servers => [ { address => "localhost:11211", noreply => 0 } ] , compress_t
memcached(プãƒãƒˆã‚³ãƒ«)ã®ãƒ‡ãƒ¼ã‚¿ãƒ¬ãƒ—リケーション - （ã²ï¼‰ãƒ¡ãƒ¢
国内ã ã‘ã§ãªã国外(ãªãœã‹ä¸»ã«ä¸å›½èªž)ã§ã‚‚ã¾ã repcachedã«ã¤ã„ã¦è¨€åŠã—ã¦ã‚‹ã®ã‚’ã¡ã‚‰ã»ã‚‰è¦‹ã‹ã‘ã‚‹ã®ã§ã™ãŒã€repcachedã¯memcached 1.2.8ベースã§ã™ã—(memcached 1.4.5ã«å¯¾å¿œã—ã¦ã‚‹äººã‚‚ã„るよã†ã§ã™ãŒ)ã„ã¾ãªã‚‰Kyoto Tycoon使ãˆã°ã„ã„ã‚“ã˜ã‚ƒãªã„ã‹ã¨æ€ã†ã®ã§ã™ã€‚ Kyoto Tycoonãªã‚‰: memcachedプãƒãƒˆã‚³ãƒ«ãƒ—ラグインを使ãˆã°ã€Kyoto TycoonãŒãã®ã¾ã¾memcachedã®ä»£æ›¿ã«ãªã‚‹ï¼ˆmemcachedプãƒãƒˆã‚³ãƒ«ã‚’喋るクライアントコードã¯ãã®ã¾ã¾ã§ã‚ˆã„） Tokyo Tyrantã¨é•ã£ã¦expireã‚‚OK memcachedã®ä»£æ›¿ãŒç›®çš„ãªã‚‰ã€é€Ÿã„オンメモリDB(StashDBã¨ã‹)ã§OK éžåŒæœŸãƒ¬ãƒ—リケーションもã§ãã‚‹ ホットスタンãƒã‚¤å´ã®ã‚µãƒ¼ãƒãƒªã‚½ãƒ¼ã‚¹ãŒç„¡é§„ã«æ€ã†ãªã‚‰ã€keyã«å¿œã˜ã¦modã¨ã‹ã§ãƒªã‚¯ã‚¨ã‚¹ãƒˆã™ã‚‹ã‚µãƒ¼ãƒã‚’2å°ã®
What's new in memcached (part 2)
Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message What's new in memcached =======================(part two - new feature proposals) Table of Contents ================= 1 Protocol 1.1 Virtual buckets! 1.2 TAP 1.3 New commands 1.3.1 VERBOSITY 1.3.2 TOUCH, GAT and GATQ 1.3.3 SET_VBUCKET, GET_VBUCKET, DEL_VBUCKET 1.3
What's New in Memcached? (part one)
Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message We've done a lot of work since the latest 1.4.x release, but most of it has been invisible to most users. To catch up those who haven't been actively watching development, we're going to ease you into how it affects different segments of users, starting with gener
開発メモ: DBサーãƒã®noreplyオプションã«ã‚ˆã‚‹é«˜é€ŸåŒ–
Kyoto Tycoonã‚„memcachedã«ã¦noreplyオプションを使ã£ã¦ãƒ‘フォーマンスを上ã’る話。 noreplyã®åŠŸç½ª DBã«å¯¾ã™ã‚‹æ›´æ–°æ“作ã¯ãã®æˆå¦ã‚’真å½å€¤ãªã©ã¨ã—ã¦å‘¼å‡ºå´ã«è¿”ã™ã®ãŒé€šå¸¸ã§ã‚ã‚‹ãŒã€ãれをçœç•¥ã™ã‚‹ã“ã¨ã§ãƒ‘フォーマンスを上ã’ã‚‹ã“ã¨ãŒã§ãる。memcachedã§ã¯noreplyオプションã¨ã—ã¦çŸ¥ã‚‰ã‚Œã¦ã„る。KTã®æœ€æ–°ç‰ˆã‹ã‚‰ã¯ã€memcachedプラグインã¨ç‹¬è‡ªãƒã‚¤ãƒŠãƒªãƒ—ãƒãƒˆã‚³ãƒ«ã§ã‚‚noreplyオプションをサãƒãƒ¼ãƒˆã™ã‚‹ã“ã¨ã«ã—ãŸã€‚ noreplyを有効ã«ã™ã‚‹ã¨ãªãœé«˜é€ŸåŒ–ã™ã‚‹ã®ã‹ã€‚クライアントã¯ã‚¯ã‚¨ãƒªã‚’sendã—ãŸã ã‘ã§ã€recvã‚’ã›ãšã«æ¬¡ã®å‡¦ç†ã«ç§»ã‚Œã‚‹ã‹ã‚‰ã 。sendシステムコールã«æ¸¡ã—ãŸãƒ‡ãƒ¼ã‚¿ã¯ã‚«ãƒ¼ãƒãƒ«ãŒéžåŒæœŸã«å‡¦ç†ã™ã‚‹ã®ã§ã€ã‚«ãƒ¼ãƒãƒ«ã¨ã‚¢ãƒ—リケーションã¯ä¸¦åˆ—ã«å‡¦ç†ã‚’進ã‚ã‚‹ã“ã¨ãŒã§ãる。recvã‚’ã—ãŸå ´åˆã«ã¯ãã®æ™‚点ã§ä¸¡è€…ã®å¾…ã¡åˆã‚ã›ãŒç™ºç”Ÿã—ã¦ã—ã¾ã†ã®ã ãŒã€ãれをã—ãª
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GitHub - tumblr/memkeys: a top like tool for inspecting memcache key values in realtime
Google Code Archive - Long-term storage for Google Code Project Hosting.
GitHub - twitter/twemproxy: A fast, light-weight proxy for memcached and redis
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