这篇文章主要介绍了关于centos下循环测试php对redis和共享内存(shm)读写的效率，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下
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
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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
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
对redis进行10000次读测试
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
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。
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