摘要：和還有共享內存都是讀取內存的數據，為了測試一下到底效率誰更勝一籌，我在我的虛擬機下做了一次公平的測試。

redis和memcache還有共享內存都是讀取內存的數據，為了測試一下到底效率誰更勝一籌，我在我的Centos虛擬機下做了一次公平的測試。

測試參數

環境：Centos （配置忽略）、語言：PHP、WebServer：Nginx、測試次數：10000、字符類型及長度：字符串（1024）

準備測試

 
  array ("id" => "4146","attacksdfdsfdsffffdffffdffffddd" => "5.45","atk_class" => "神圣級","wufang" => "4.9","def_class" => "超神級","cefang" => "4.9","mdf_class" => "超神級","hp" => "6.43","hp_class" => "神王級","dodge" => "55","dodge_class" => "SSSS","crit" => "50","crit_class" => "SSS","penetrate" => "55","penetrate_class" => "SSSS","mingzhong" => "51","hit_class" => "SSSS","anti_dizziness" => "0","anti_dizzinesssdfdsfdsfdsfdsfds_class" => "F","anti_critical" => "20","anti_critical_class" => "F","tenacity" => "0","tenacity_class" => "F",
  ),
  2 => 
  array ("id" => "414ddffff7","attack" => "5.45","atk_class" => "神圣級","wufang" => "4.95","def_class" => "超神級","cefang" => "4.95","mdf_class" => "超神級","hp" => "6.43","hp_class" => "神王級","dodge" => "55","dodge_class" => "SSSS","crit" => "50","crit_class" => "SSS","penetrate" => "55","penetrate_class" => "SSSS","mingzhong" => "51","hit_class" => "SSSS","anti_dizziness" => "0","anti_dizziness_clsdfdsfdsfdsfdsfdsass" => "F","anti_critical" => "20","anti_critical_class" => "F","tenacity" => "0","tenacity_class" => "F",
  ));

$str = json_encode($arr);
echo strlen($str);          //輸出1024

對redis進行10000次寫入測試

connect("127.0.0.1",6379);
$redis->auth("310c8cabcdefghf2d8abcdefd44496ac80");
$start = microtime(true) ;

for($i = 0; $i<10000; $i++) {
    $redis->set("key", $str);
}
echo microtime(true) - $start;    //執行5次，大概平均結果為  1.7016470432281 秒

對共享內存(shm)進行10000次寫入測試

對redis進行10000次讀測試
connect("127.0.0.1",6379);
$redis->auth("310c8cabcdefghf2d8abcdefd44496ac80");
$start = microtime(true) ;

for($i = 0; $i<10000; $i++) {
    $redis->get("key");
}
echo microtime(true) - $start;     //執行5次，大概平均結果為 2.1236310005188 秒
對共享內存(shm)進行10000次讀測試

結果清單
Redis     讀：2.1秒             寫：1.7秒
Shm       讀：0.0021秒      寫：0.0025 秒
可見，效果差別懸殊。