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配合memcache监控程序，测试memcache分布式，文章参考了网上某位牛人的文章。

测试crc32 fnv standard consistent 组合情况下的item分布情况及添加新服务器对现有item命中率的影响。

先开memcached服务器

#!/bin/bash
##############################
# MyZ 2009-07-12
# File:memcached_12.sh
##############################
port=11212
for (( i=11212; i<11224; i++ ))
do
 /usr/local/bin/memcached -u root -p $i -m 10 &
done

./memcached.sh

结论
使用memcache这种客户端下的方法保证分配均匀的基础下，存货率做高的是crc32+ consistent。

测试结果

//crc32 standard
192.168.1.101:11212 => items:9812
192.168.1.101:11213 => items:10153
192.168.1.101:11214 => items:9895
192.168.1.101:11215 => items:9985
192.168.1.101:11216 => items:10206
192.168.1.101:11217 => items:9958
192.168.1.101:11218 => items:10159
192.168.1.101:11219 => items:9941
192.168.1.101:11220 => items:9924
192.168.1.101:11221 => items:9967
192.168.1.101:11222 => items:0%
192.168.1.101:11223 => items:0%

//fnv standard
192.168.1.101:11212 => items:9911
192.168.1.101:11213 => items:9978
192.168.1.101:11214 => items:9928
192.168.1.101:11215 => items:10053
192.168.1.101:11216 => items:9952
192.168.1.101:11217 => items:10055
192.168.1.101:11218 => items:10013
192.168.1.101:11219 => items:10089
192.168.1.101:11220 => items:9947
192.168.1.101:11221 => items:10074
192.168.1.101:11222 => items:0
192.168.1.101:11223 => items:0

//crc32 consistent
192.168.1.101:11212 => items:12466
192.168.1.101:11213 => items:10175
192.168.1.101:11214 => items:8436
192.168.1.101:11215 => items:9118
192.168.1.101:11216 => items:11757
192.168.1.101:11217 => items:9208
192.168.1.101:11218 => items:10343
192.168.1.101:11219 => items:8417
192.168.1.101:11220 => items:8716
192.168.1.101:11221 => items:11364
192.168.1.101:11222 => items:0
192.168.1.101:11223 => items:0

//fnv consistent
192.168.1.101:11212 => items:9014
192.168.1.101:11213 => items:13178
192.168.1.101:11214 => items:10053
192.168.1.101:11215 => items:4302
192.168.1.101:11216 => items:10875
192.168.1.101:11217 => items:4906
192.168.1.101:11218 => items:15593
192.168.1.101:11219 => items:9993
192.168.1.101:11220 => items:8093
192.168.1.101:11221 => items:13993
192.168.1.101:11222 => items:0
192.168.1.101:11223 => items:0

用于检测memcache的程序配置部分

for ($i = 11212; $i < 11222; $i++) {
 $MEMCACHE_SERVERS[] = '192.168.1.101:'.$i; // add more as an array
}
$MEMCACHE_SERVERS[] = '192.168.1.101:11222'; // add more as an array
$MEMCACHE_SERVERS[] = '192.168.1.101:11223'; // add more as an array

测试代码

<?php<br /> /**<br /> * @name test.php<br /> * @date Thu Jul 12 21:18:59 CST 2009<br /> * @copyright 马永占(MyZ)<br /> * @author 马永占(MyZ)<br /> * @link http://blog.csdn.net/mayongzhan/<br /> */<br /> set_time_limit(0);</p> <p>//crc32 standard<br /> //ini_set('memcache.hash_function','crc32');<br /> //ini_set('memcache.hash_strategy','standard');<br /> //crc32 consistent<br /> ini_set('memcache.hash_function','crc32');<br /> ini_set('memcache.hash_strategy','consistent');<br /> //fnv standard<br /> //ini_set('memcache.hash_function','fnv');<br /> //ini_set('memcache.hash_strategy','standard');<br /> //fnv consistent<br /> //ini_set('memcache.hash_function','fnv');<br /> //ini_set('memcache.hash_strategy','consistent');</p> <p>$memcache_server_ip = '192.168.1.101';<br /> for ($i = 11212; $i < 11222; $i++) {<br /> $memcache_servers_ports[] = $i;<br /> }<br /> $memcache_servers_ports_add[] = 11222;<br /> $memcache_servers_ports_add[] = 11223;</p> <p>$mem = new Memcache;<br /> //add servers<br /> foreach ($memcache_servers_ports as $value) {<br /> $mem->addServer($memcache_server_ip, $value);<br /> }<br /> //set items<br /> for($i = 0; $i < 100000; $i++) {<br /> $mem->set($i, $i, 0, 3600);<br /> }<br /> //add 2 new servers<br /> foreach ($memcache_servers_ports_add as $value) {<br /> $mem->addServer($memcache_server_ip, $value);<br /> }<br /> //get items<br /> for($i = 0; $i < 100000; $i++) {<br /> $mem->get($i);<br /> }<br /> $status = $mem->getExtendedStats();<br /> foreach ($status as $key=>$value) {<br /> echo $key<br /> . ' => items:'<br /> . $value['curr_items']<br /> . '<br />';<br /> }<br /> $mem->close();<br /> ?></p> <p>