使用memcache对wordpress优化,提速
环境：
一个本地开发环境
一个部署在虚拟机中（ 虚拟机安装memcache缓存）,然后用这个优化的版本跟本地开发环境对比.
wordpress版本：4.9.5
php:5.6版本
1，首先在主题的functions.php文件中，加入以下监控统计代码
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function performance( $visible = true ) {
$stat = sprintf( '%d queries in %.3f seconds, using %.2fMB memory',
get_num_queries(),
timer_stop( 0, 3 ),
memory_get_peak_usage() / 1024 / 1024
);
// echo $visible ? $stat : "<!-- {$stat} -->" ;
echo "<div class='container_12'><p class='grid_12 footer clearfix'>$stat</p></div>";
}
add_action( 'wp_footer', 'performance', 20 );
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样式可以根据自己的主题定制，这段代码可以统计出页面有多少次数据库查询。总共花了多少秒，耗费多少内存，类似如下的样式：
16 queries in 1.306 seconds, using 12.98MB memory
2，安装memcached服务端
[root@bogon wp-content]# ps -ef | grep memcached
root 5050 3466 0 14:44 pts/1 00:00:00 grep memcached
root 29269 1 0 13:57 ? 00:00:02 /usr/local/memcached/bin/memcached -d -l 127.0.0.1 -p 11211 -u root -m 64 -c 1024 -P /var/run/memcached.pid
3，安装php memcache扩展
wget http://pecl.php.net/get/memcache-3.0.8.tgz，用phpize外挂方式安装，安装完成之后，在php.ini中启用，再重启php,确定memcache已经加载
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memcache
memcache support enabled
Version 3.0.8
Revision $Revision: 329835 $
Directive Local Value Master Value
memcache.allow_failover 1 1
memcache.chunk_size 32768 32768
memcache.compress_threshold 20000 20000
memcache.default_port 11211 11211
memcache.hash_function crc32 crc32
memcache.hash_strategy consistent consistent
memcache.lock_timeout 15 15
memcache.max_failover_attempts 20 20
memcache.protocol ascii ascii
memcache.redundancy 1 1
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4，下载wordpress memcache插件
wget https://downloads.wordpress.org/plugin/memcached.3.0.1.zip
把object-cache.php解压到wp-content目录下
[root@bogon wp-content]# ls
index.php languages object-cache.php package.xml plugins themes upgrade uploads
[root@bogon wp-content]#
最后比较服务器
安装了memcache缓存的版本，首页性能：
3 queries in 0.451 seconds, using 13.56MB memory
没有启用缓存的系统，首页性能：
16 queries in 1.336 seconds, using 12.98MB memory
可以看见有很明显的提升，其他页面都会被优化，缓存到
启用opcache，再次提速：
3 queries in 0.129 seconds, using 3.48MB memory
php.ini中opcache需要这样加载：
zend_extension=opcache.so
opcache相关配置：
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[opcache]
; Determines if Zend OPCache is enabled
opcache.enable=1
; Determines if Zend OPCache is enabled for the CLI version of PHP
opcache.enable_cli=1
; The OPcache shared memory storage size.
opcache.memory_consumption=528
; The amount of memory for interned strings in Mbytes.
opcache.interned_strings_buffer=8
; The maximum number of keys (scripts) in the OPcache hash table.
; Only numbers between 200 and 100000 are allowed.
opcache.max_accelerated_files=10000
; The maximum percentage of "wasted" memory until a restart is scheduled.
;opcache.max_wasted_percentage=5
"php.ini" 2051L, 74201C written
[ldap]
; Sets the maximum number of open links or -1 for unlimited.
ldap.max_links = -1
[mcrypt]
; For more information about mcrypt settings see http://php.net/mcrypt-module-open
; Directory where to load mcrypt algorithms
; Default: Compiled in into libmcrypt (usually /usr/local/lib/libmcrypt)
;mcrypt.algorithms_dir=
; Directory where to load mcrypt modes
; Default: Compiled in into libmcrypt (usually /usr/local/lib/libmcrypt)
;mcrypt.modes_dir=
[dba]
;dba.default_handler=
[opcache]
; Determines if Zend OPCache is enabled
opcache.enable=1
; Determines if Zend OPCache is enabled for the CLI version of PHP
opcache.enable_cli=1
; The OPcache shared memory storage size.
opcache.memory_consumption=528
; The amount of memory for interned strings in Mbytes.
opcache.interned_strings_buffer=8
; The maximum number of keys (scripts) in the OPcache hash table.
; Only numbers between 200 and 100000 are allowed.
opcache.max_accelerated_files=10000
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作者:ghostwu, 出处:http://www.cnblogs.com/ghostwu 博客大多数文章均属原创，欢迎转载，且在文章页面明显位置给出原文连接