ruby系統使用memcache緩衝

標籤：緩衝   caching   cache   ruby   rails   

      http://guides.rubyonrails.org/

     仔細讀一下手冊裡的關於cache的相關部分，注意一句話：

 This flag is normally set in the corresponding config/environments/*.rb and caching is disabled by default for development and test, and enabled for production.

預設的開發環境是沒有開啟緩衝的，如果我們要測試緩衝，需要手動開啟，把預設的false改為true。

$vim config/environments/development.rb

config.action_controller.perform_caching = true

準備活動做完了正式開始啦。

(1)首先在Gemfile裡增加對應的gem，增加完運行 $bundle install 安裝一下。

(2)在對應的interface檔案夾裡新增相應的cache語句，從第4行到第七行，中間刪除的語句請忽略～

(3)在config/application.rb裡增加cache儲存的namespace

(4)最後要在config/settings.rb裡增加namespace

＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝

(5)查一下是否有產生對應的key

$ telnet 127.0.0.1 11211

Trying 127.0.0.1...

Connected to 127.0.0.1.

Escape character is ‘^]‘.

stats

STAT pid 1024

STAT uptime 99957

STAT time 1428992525

STAT version 1.4.13

STAT libevent 2.0.16-stable

STAT pointer_size 64

STAT rusage_user 1.024064

STAT rusage_system 0.816051

STAT curr_connections 7

STAT total_connections 9

STAT connection_structures 8

STAT reserved_fds 20

STAT cmd_get 15

STAT cmd_set 2

STAT cmd_flush 0

STAT cmd_touch 0

STAT get_hits 0

STAT get_misses 15

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 1720

STAT bytes_written 633

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 expired_unfetched 0

STAT evicted_unfetched 0

STAT bytes 157

STAT curr_items 1

STAT total_items 2

STAT evictions 0

STAT reclaimed 0

END

ERROR

ERROR

ERROR

stats items

STAT items:4:number 1

STAT items:4:age 936

STAT items:4:evicted 0

STAT items:4:evicted_nonzero 0

STAT items:4:evicted_time 0

STAT items:4:outofmemory 0

STAT items:4:tailrepairs 0

STAT items:4:reclaimed 0

STAT items:4:expired_unfetched 0

STAT items:4:evicted_unfetched 0

END

stats cachedump 4 100

ITEM ott-youku-cms-development:views/ce5f4eac26ac2773a497d1d557255964.json [22 b; 1428992202 s]

END

===============

在log裡查看是第一次請求的時候寫cache，第二次請求唯讀取cache，不用讀表

Started GET "/interface/system_control/xx_blacklists.json" for 127.0.0.1 at 2015-04-14 14:23:19 +0800 

14:23:19 INFO:   Processing by Interface::SystemControlController#xx_blacklists as JSON 

14:23:19 DEBUG: Cache read: views/ce5f4eac26ac2773a497d1d557255964.json ({:expires_in=>600}) 

14:23:19 INFO: Read fragment views/ce5f4eac26ac2773a497d1d557255964.json (0.4ms) 

14:23:19 DEBUG:   SQL (0.1ms)  SELECT COUNT(*) FROM `cms_tv_pidlists` WHERE `cms_tv_pidlists`.`state` = 1 AND (pid = ‘‘ and pid_type = 1) 

14:23:19 DEBUG:   SQL (0.1ms)  SELECT COUNT(*) FROM `cms_client` WHERE `cms_client`.`pid_stat` = 1 AND `cms_client`.`partner_mode` = 12 AND (pid = ‘‘) 

14:23:19 DEBUG:   SQL (0.1ms)  SELECT COUNT(*) FROM `cms_client` WHERE `cms_client`.`pid_stat` = 1 AND `cms_client`.`partner_mode` = 17 AND (pid = ‘‘) 

14:23:19 DEBUG:   SQL (0.1ms)  SELECT COUNT(*) FROM `cms_tv_pidlists` WHERE `cms_tv_pidlists`.`state` = 1 AND (pid = ‘‘ and pid_type = 2) 

14:23:19 DEBUG:   SQL (0.1ms)  SELECT COUNT(*) FROM `cms_tv_blacklists` WHERE `cms_tv_blacklists`.`state` = 1 AND `cms_tv_blacklists`.`blacklist_type` = ‘UA‘ AND (code = ‘‘) 

14:23:19 DEBUG: Cache write: views/ce5f4eac26ac2773a497d1d557255964.json ({:expires_in=>600}) 

14:23:19 INFO: Write fragment views/ce5f4eac26ac2773a497d1d557255964.json (0.4ms) 

14:23:19 INFO: Completed 200 OK in 74ms (Views: 3.0ms | ActiveRecord: 0.5ms) 

14:24:18 INFO: 

Started GET "/interface/system_control/xx_blacklists.json" for 127.0.0.1 at 2015-04-14 14:24:18 +0800 

14:24:18 INFO:   Processing by Interface::SystemControlController#youku_blacklists as JSON 

14:24:18 DEBUG: Cache read: views/ce5f4eac26ac2773a497d1d557255964.json ({:expires_in=>600}) 

14:24:18 INFO: Read fragment views/ce5f4eac26ac2773a497d1d557255964.json (0.4ms) 

14:24:18 INFO: Completed 200 OK in 42ms 

14:24:18 INFO: 

按住 ctrl + ]

telnet> 

輸入quit 就可以推出了

ruby系統使用memcache緩衝