php memcache hash方法均衡性测试

432ewd

支持两种hash方法： crc32 fnv
配置如下：

;  Hash function {crc32, fnv}

memcache.hash_function=fnv

set key脚本：

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<?php $cluster = array(     array('host' => '127.0.0.1', 'port' => '11211'),     array('host' => '127.0.0.1', 'port' => '11212'),     array('host' => '127.0.0.1', 'port' => '11213'),     array('host' => '127.0.0.1', 'port' => '11214'),     array('host' => '127.0.0.1', 'port' => '11215'),     ); $memcache = new Memcache; foreach ($cluster as $mc) {     $host = $mc['host'];     $port = $mc['port'];     if ($memcache->addServer($host, $port)) {         echo "Add $host:$port to cluster\n";     } else {         echo "Failed to add $host:$port to cluster\n";     } } $ok = 0; for ($n=1; $n <= 200000 ; $n++) {     $key = "k".$n;     if (! $memcache->set($key, 1)) {         echo "Failed to set $key\n";     } else {         $ok ++;     }     if ($n % 100 == 0) {         echo "Completed set $n key to cache\n";     } } echo "Set OK: $ok\n"; $memcache->close(); ?>

启动cache脚本：

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#!/bin/bash pkill memcached if [ $? == 0 ];then     echo "kill all memcached" else     echo "failed to kill cached"     exit 1 fi memcached -d -p 11211 -u memcached -m 64 -c 1024 & memcached -d -p 11212 -u memcached -m 64 -c 1024 & memcached -d -p 11213 -u memcached -m 64 -c 1024 & memcached -d -p 11214 -u memcached -m 64 -c 1024 & memcached -d -p 11215 -u memcached -m 64 -c 1024 & sleep 1 ps aux | grep memcached

结果检查脚本：

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#!/bin/bash T11211=`echo stats | nc 127.0.0.1 11211 | grep cmd_set | awk '{print $3}'` T11212=`echo stats | nc 127.0.0.1 11212 | grep cmd_set | awk '{print $3}'` T11213=`echo stats | nc 127.0.0.1 11213 | grep cmd_set | awk '{print $3}'` T11214=`echo stats | nc 127.0.0.1 11214 | grep cmd_set | awk '{print $3}'` T11215=`echo stats | nc 127.0.0.1 11215 | grep cmd_set | awk '{print $3}'` echo "11211 = $T11211" echo "11212 = $T11212" echo "11213 = $T11213" echo "11214 = $T11214" echo "11215 = $T11215"

最终结果对比：
crc32：

11211 = 51180

11212 = 47519

11213 = 26179

11214 = 29082

11215 = 46040

fnv：

11211 = 47085

11212 = 35358

11213 = 49721

11214 = 18787

11215 = 49049