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
测试数据
<?php
//测试数据
$arr = array( =>
array ('id' => '','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' => '','dodge_class' => 'SSSS','crit' => '','crit_class' => 'SSS','penetrate' => '','penetrate_class' => 'SSSS','mingzhong' => '','hit_class' => 'SSSS','anti_dizziness' => '','anti_dizzinesssdfdsfdsfdsfdsfds_class' => 'F','anti_critical' => '','anti_critical_class' => 'F','tenacity' => '','tenacity_class' => 'F',
),
=>
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' => '','dodge_class' => 'SSSS','crit' => '','crit_class' => 'SSS','penetrate' => '','penetrate_class' => 'SSSS','mingzhong' => '','hit_class' => 'SSSS','anti_dizziness' => '','anti_dizziness_clsdfdsfdsfdsfdsfdsass' => 'F','anti_critical' => '','anti_critical_class' => 'F','tenacity' => '','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',);
$redis->auth('310c8cabcdefghf2d8abcdefd44496ac80');
$start = microtime(true) ; for($i = ; $i<; $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 = ;
$shmid = @shmop_open($key, 'c', , $size);
$start = microtime(true);
for($i = ; $i<; $i++) {
shmop_write($shmid, $str, );
}
@shmop_close($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',);
$redis->auth('310c8cabcdefghf2d8abcdefd44496ac80');
$start = microtime(true) ; for($i = ; $i<; $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 = ;
$shmid = @shmop_open($key, 'c', , $size);
$start = microtime(true);
for($i = ; $i<; $i++) {
shmop_read($shmid, ,);
}
@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。