From:?http://blog.51yip.com/cache/1318.html

redis和memcache非常像的，都是key,value的方式，將數據存放內存中。最近在學習redis，在網上看了一些這方面的資料，有三種觀點：

1,redis讀寫內存比memcache快

2,memcache讀寫內存比redis快

3,memcache讀寫內存比redis快，但是redis整體性能優于memcache

所以我做了一下測試。關于redis和memcache的安裝，請參考

linux redis 安裝配置, 以及redis php擴展

linux memcache 安裝

1，redis的測試文件

查看復制打印?

<?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的測試結果

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登錄一下，把test對應的值清除掉，保重測試的公平性
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, GPL Open Source Software.

Benchmarking: GET http://localhost/php-redis/test_redis.php
10000 clients, 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, GPL Open Source Software.

Benchmarking: GET http://localhost/php-redis/test_redis.php
10000 clients, 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測試文件

查看復制打印?

<?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;??

}??

??

$mem?=?new?Memcache;??

$mem->connect("127.0.0.1",11211)?or?die?("Could?not?connect");??

$value?=?$mem->get('test1');??

if?(emptyempty($value))?{??

???$value?=?json_encode(get_data());??

???$mem->set('test1',$value,0,?600);??

}??

??

print_r(json_decode($value));??

?>??

4，memcache測試結果

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登錄一下，把test1對應的值清除掉，保重測試的公平性
delete test1

第二次

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

telnet 127.0.0.1 11211
delete test1

第三次

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

telnet 127.0.0.1 11211
delete test1

從上面比較結果，可以看出，memcache比redis快的。redis對key,value的管理，更靈活。有很多人把redis歸于nosql的范圍，細細想，還真是那么一回事。redis還可以把內在中的數據，放到磁盤中，這一點上，redis更像memcachedb。關于使用哪一種，看個人喜好而定了。

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