Centos下10000次循环测试php对Redis和共享内存(shm)读写效率

redis和memcache还有共享内存都是读取内存的数据，为了测试一下到底效率谁更胜一筹，我在我的Centos虚拟机下做了一次公平的测试。

测试参数

环境：Centos （配置忽略）、语言：PHP、WebServer：Nginx、测试次数：10000、字符类型及长度：字符串（1024）

准备测试

<?php
//测试数据
$arr = array( 1 => 
  array ('id' => '4146','attacksdfdsfdsddddddddddd' => '5.45','atk_class' => '神圣级','wufang' => '4.9','def_class' => '超神级','cefang' => '4.9','mdf_class' => '超神级','hp' => '6.43','hp_class' => '神王级','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' => '神圣级','wufang' => '4.95','def_class' => '超神级','cefang' => '4.95','mdf_class' => '超神级','hp' => '6.43','hp_class' => '神王级','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);          //输出1024

对redis进行10000次写入测试

<?php
$redis = new Redis();
$redis->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;    //执行5次，大概平均结果为  1.7016470432281 秒

对共享内存(shm)进行10000次写入测试

<?php
$key = 0x4337b123;  
$size = 1024;  
$shmid = @shmop_open($key, 'c', 0644, $size);  
$start = microtime(true);
for($i = 0; $i<10000; $i++) {
    shmop_write($shmid, $str, 0); 
}
@shmop_close($shmid);
echo microtime(true) - $start;  //执行5次，大概平均结果为 0.0025370121002197 秒

对redis进行10000次读测试

<?php
$redis = new Redis();
$redis->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;     //执行5次，大概平均结果为 2.1236310005188 秒

对共享内存(shm)进行10000次读测试

<?php
$key = 0x4337b123;  
$size = 1024;  
$shmid = @shmop_open($key, 'c', 0644, $size);  
$start = microtime(true);
for($i = 0; $i<10000; $i++) {
    shmop_read($shmid, 0,1024);
}
@shmop_close($shmid);
echo microtime(true) - $start;     //执行5次，大概平均结果为 0.0021078586578369 秒

结果清单

Redis 读：2.1秒 写：1.7秒

Shm 读：0.0021秒 写：0.0025 秒

可见，效果差别悬殊。