使用xdebug分析thinkphp框架函数调用图
使用xdebug分析thinkphp框架函数调用图
开发中需要性能调优,使用xdebug分析thinkphp框架函数调用图。
关于xdebug的安装参考这2篇
NetBeans配置Xdebug 远程调试PHP
php扩展xdebug安装以及用kcachegrind系统分析
1.安装xdebug
需要先去http://www.xdebug.org看看一些文档,xdebug作为php扩展安装
# http://www.xdebug.org/files/xdebug-2.3.3.tgz
# tar -xzf xdebug-2.3.3.tgz
# cd xdebug-2.3.3
# /usr/local/php/bin/phpize
# ./configure --enable-xdebug --with-php-config=/usr/local/php/bin/php-config
# make && make install
2.给权限
# mkdir -p /tmp/xdebug
# chmod 755 /tmp/xdebug
# chown nobody:nobody /tmp/xdebug
3.修改php配置
修改php.ini文件
[Xdebug]
zend_extension=xdebug.so
xdebug.profiler_enable=on
xdebug.trace_output_dir=/tmp/xdebug
xdebug.profiler_output_dir=/tmp/xdebug
4.重启php-fpm
# killall php-fpm
# /etc/init.d/php-fpm
5.运行PHP产生日志
配置好之后,运行php文件就会在/tmp/xdebug下生成类似这样的日志文件
-rw-r--r-- 1 nobody nobody 4615252 Oct 27 17:31 cachegrind.out.29293
6.使用kcachegrind图形化分析日志
windows port of kcachegrind
每一步函数调用看的很清晰:
问题最严重就是出在execute,其实也就是大量的SQl查询。called就是函数调用次数。
优化办法很多,使用memcached或者直接使用thinkphp自带的各自缓存,这个是优化后的图,明显看出called少了。
查询缓存
http://document.thinkphp.cn/manual_3_2.html#query_cache
对于及时性要求不高的数据查询,我们可以使用查询缓存功能来提高性能,而且无需自己使用缓存方法进行缓存和获取。
查询缓存功能支持所有的数据库,并且支持所有的缓存方式和有效期。
在使用查询缓存的时候,只需要调用Model类的cache方法,例如:
1.$Model->cache(true)->where('status=1')->select();
SQL解析缓存
http://document.thinkphp.cn/manual_3_2.html#sql_build_cache
除了查询缓存之外,ThinkPHP还支持SQL解析缓存,因为ThinkPHP的ORM机制,所有的SQL都是动态生成的,然后由数据库驱动执行。
所以如果你的应用有大量的SQL查询需求,那么可以开启SQL解析缓存以减少SQL解析提高性能。要开启SQL解析缓存,只需要设置:
1.'DB_SQL_BUILD_CACHE' => true,
即可开启数据库查询的SQL创建缓存,默认缓存方式为文件方式,还可以支持xcache和apc方式缓存,只需要设置:
1.'DB_SQL_BUILD_QUEUE' => 'xcache',
我们知道,一个项目的查询SQL的量可能会非常巨大,所以有必要设置下缓存的队列长度,例如,我们希望SQL解析缓存不超过20条记录,可以设置:
1.'DB_SQL_BUILD_LENGTH' => 20, // SQL缓存的队列长度。
How profilers lie: the cases of gprof and KCachegrind
为 PHP 应用提速、提速、再提速!,第 2 部分: 分析 PHP 应用程序以查找、诊断和加速运行缓慢的代码

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