redis memcache 性能比较

redis和memcache非常像的，都是key,value的方式，将数据存放内存中。最近在学习redis，在网上看了一些这方面的资料，有三种观点：

1,redis读写内存比memcache快

2,memcache读写内存比redis快

3,memcache读写内存比redis快，但是redis整体性能优于memcache

所以我做了一下测试。关于redis和memcache的安装，请参考

1，redis的测试文件

PHP
function get_data (){
   MysqL_connect("localhost","root","") or die("Could not connect: " . MysqL_error());
   MysqL_select_db("ugc");

   $result = MysqL_query("SELECT task_id FROM ugc_tasks");
   $return = array();
   while ($row = MysqL_fetch_array($result,MysqL_ASSOC)) {
      $return[] = $row;
   }

   MysqL_free_result($result);
   return $return;
}

$redis = new redis();
$redis->connect('127.0.0.1',6379);

if ($redis->exists('test')) {
   $value = $redis->get("test");
}else{
   $value = get_data();
   $redis->set('test',json_encode($value));
}

print_r(json_decode($value));
?>

2，redis的测试结果

第一次
root@ubuntu:/home/zhangying/download/webbench-1.5# webbench -c 10000 -t 30 http://localhost/PHP-redis/test_redis.PHP
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004,GPL Open Source Software.

Benchmarking: GET http://localhost/PHP-redis/test_redis.PHP
10000 clients,running 30 sec.

Speed=48324 pages/min,40318471 bytes/sec.
Requests: 22599 susceed,1563 Failed.

telnet 127.0.0.1 6379 telnet登录一下，把test对应的值清除掉，保重测试的公平性
del test

第二次
root@ubuntu:/home/zhangying/download/webbench-1.5# webbench -c 10000 -t 30 http://localhost/PHP-redis/test_redis.PHP
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004,running 30 sec.

Speed=53570 pages/min,41217689 bytes/sec.
Requests: 23106 susceed,3679 Failed.

telnet 127.0.0.1 6379
del test

第三次
root@ubuntu:/home/zhangying/download/webbench-1.5# webbench -c 10000 -t 30 http://localhost/PHP-redis/test_redis.PHP
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004,running 30 sec.

Speed=49450 pages/min,39694073 bytes/sec.
Requests: 22301 susceed,2424 Failed.

telnet 127.0.0.1 6379
del test

3,memcache测试文件

PHP
function get_data (){
   MysqL_connect("localhost",MysqL_ASSOC)) {
       $return[] = $row;
   }

   MysqL_free_result($result);
   return $return;
}

$mem = new Memcache;
$mem->connect("127.0.0.1",11211) or die ("Could not connect");
$value = $mem->get('test1');
if (empty($value)) {
   $value = json_encode(get_data());
   $mem->set('test1',$value,600);
}

print_r(json_decode($value));
?>

4，memcache测试结果

第一次

root@ubuntu:/home/zhangying/download/webbench-1.5# webbench -c 10000 -t 30 http://localhost/PHP-redis/test_memcache.PHP
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004,GPL Open Source Software.

Benchmarking: GET http://localhost/PHP-redis/test_memcache.PHP
10000 clients,running 30 sec.

Speed=61632 pages/min,52228667 bytes/sec.
Requests: 29205 susceed,1611 Failed.

telnet 127.0.0.1 11211 telnet登录一下，把test1对应的值清除掉，保重测试的公平性
delete test1

第二次

Speed=64160 pages/min,52601449 bytes/sec.
Requests: 29426 susceed,2654 Failed.

telnet 127.0.0.1 11211
delete test1

第三次

Speed=65190 pages/min,52506614 bytes/sec.
Requests: 29348 susceed,3247 Failed.

telnet 127.0.0.1 11211
delete test1

从上面比较结果，可以看出，memcache比redis快的。redis对key,value的管理，更灵活。有很多人把redis归于nosql的范围，细细想，还真是那么一回事。redis还可以把内在中的数据，放到磁盘中，这一点上，redis更像memcachedb。关于使用哪一种，看个人喜好而定了。

原文链接：https://www.f2er.com/redis/447326.html

redis memcache 性能比较

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