停止刪除數據在php/silverstripe/zend緩存memcache

我最近安裝了memcache（d），但數據似乎只留在緩存一分鐘左右，即使我已經設置過期到三天。我試圖緩存1000個項目，但只有少數似乎堅持！這裏是統計：停止刪除數據在php/silverstripe/zend緩存memcache

STAT pid 31586 
STAT uptime 253023 
STAT time 1480889337 
STAT version 1.4.14 (Ubuntu) 
STAT libevent 2.0.21-stable 
STAT pointer_size 64 
STAT rusage_user 17.270251 
STAT rusage_system 72.982928 
STAT curr_connections 5 
STAT total_connections 9083 
STAT connection_structures 15 
STAT reserved_fds 20 
STAT cmd_get 577101 
STAT cmd_set 217153 
STAT cmd_flush 19612 
STAT cmd_touch 0 
STAT get_hits 382249 
STAT get_misses 194852 
STAT delete_misses 10 
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 544127879 
STAT bytes_written 1028900006 
STAT limit_maxbytes 536870912 
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 434350 
STAT curr_items 163 
STAT total_items 217153 
STAT evictions 0 
STAT reclaimed 111319

和這裏的統計信息中的項目：

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STAT items:3:age 133084 
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我使用

的Ubuntu 14.04
PHP
Silverstripe 3.5.0
Zend_Cache（部分） Silvertripe）
內存緩存版本：1.4.14

下面你可以看到一些統計數據。

server stats

slab stats

這裏是一個有趣的測試，我在PHP運行：

... 
if(isset($_GET['setm'])) { 
    foreach(array('11211', '11212', '11213', '11214') as $port) { 
     echo "<h1>SETTING: $port</h1>"; 
     $memcache = new Memcache; 
     $cacheAvailable = $memcache->connect('127.0.0.1', $port); 
     if($cacheAvailable) { 
      $memcache->set('test_memcache', 'set at: '.date('Y-m-d H:i:s')); 
      echo "SET"; 
     } else { 
      echo "NOT SET"; 
     } 
    } 
} elseif(isset($_GET['getm'])) { 
    foreach(array('11211', '11212', '11213', '11214') as $port) { 
     echo "<h1>GETTING: $port</h1>"; 
     $memcache = new Memcache; 
     $cacheAvailable = $memcache->connect('127.0.0.1', $port); 
     if($cacheAvailable) { 
      $outcome = $memcache->get('test_memcache'); 
      echo $outcome; 
     } else { 
      echo "COULD NOT GET"; 
     } 
    } 
} 
...

首先我運行：SETM ...所有四個緩存，通常設置..有時候其中一個沒有設置！

然後我跑getm：

GETTING: 11211 
GETTING: 11212 
set at: 2016-12-08 16:35:46 
GETTING: 11213 
set at: 2016-12-08 16:35:46 
GETTING: 11214 
set at: 2016-12-08 16:35:46

現在，從大負荷下的網站上的數據立即消失，一分鐘左右後消失在不太繁忙的網站的數據，以及其他數據支左右。

這是怎麼回事？

我真的很感激一些指針，因爲memcache對我來說是新的。

來源

2016-12-04 Nicolaas Thiemen Francken

你是怎麼用SilverStripe配置memcached的？ Afair，您可以在那裏設置緩存時間...另請參閱：https://docs.silverstripe.org/zh/3.4/developer_guides/performance/caching/#memcached – wmk

您想緩存什麼？ – micmania1

如果您顯示最簡單的代碼，可能會更容易看到發生了什麼問題。 – davidsheldon

STAT cmd_flush 19612

SilverStripe CMS有一個內部緩存清理程序（稱爲clean（）），它調用25個地方。這是通過對memcached運行flush_all來實現的，該memcached增加了該計數器並導致整個緩存丟失。

memcached守護進程正在按設計工作：在被SilverStripe異步刷新後，內存正在被回收（請參閱在那裏的項目之下的'回收'stat）。

他們以不這樣做的方式實現memcached。

來源

2016-12-08 09:25:11 dormando

停止刪除數據在php/silverstripe/zend緩存memcache

回答

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