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linux redis 安装配置, 以及redis php扩展
linux memcache 安装
1，redis的测试文件
1.<?php
2.function get_data (){
3. mysql_connect("localhost", "root", "") or die("Could not connect: " . mysql_error());
4. mysql_select_db("ugc");
5.
6. $result = mysql_query("SELECT task_id FROM ugc_tasks");
7. $return = array();
8. while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
9. $return[] = $row;
10. }
11.
12. mysql_free_result($result);
13. return $return;
14.}
15.
16.$redis = new redis();
17.$redis->connect('127.0.0.1', 6379);
18.
19.if ($redis->exists('test')) {
20. $value = $redis->get("test");
21.}else{
22. $value = get_data();
23. $redis->set('test',json_encode($value));
24.}
25.
26.print_r(json_decode($value));
27.?>
<?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, 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测试文件
1.<?php
2.function get_data (){
3. mysql_connect("localhost", "root", "") or die("Could not connect: " . mysql_error());
4. mysql_select_db("ugc");
5.
6. $result = mysql_query("SELECT task_id FROM ugc_tasks");
7. $return = array();
8. while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
9. $return[] = $row;
10. }
11.
12. mysql_free_result($result);
13. return $return;
14.}
15.
16.$mem = new Memcache;
17.$mem->connect("127.0.0.1",11211) or die ("Could not connect");
18.$value = $mem->get('test1');
19.if (emptyempty($value)) {
20. $value = json_encode(get_data());
21. $mem->set('test1',$value,0, 600);
22.}
23.
24.print_r(json_decode($value));
25.?>
<?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 = $mem->get('test1');
if (empty($value)) {
$value = json_encode(get_data());
$mem->set('test1',$value,0, 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
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
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。
