用PHP-FPM 的 slow log 分析网站

最近从GOOGLE ananlytics 发现网站速度变慢了很多，  于是想到了PHP中的FPM慢日志功能。

好在 PHP-FPM 提供了慢执行日志，可以将执行比较慢的脚本的调用过程 dump 到日志中。

cd /etc/php5/fpm/pool.d/
vi www.conf

 修改配置

; The timeout for serving a single request after which a PHP backtrace will be
; dumped to the 'slowlog' file. A value of '0s' means 'off'.
; Available units: s(econds)(default), m(inutes), h(ours), or d(ays)
; Default Value: 0
request_slowlog_timeout = 1s

; The log file for slow requests
; Default Value: /usr/local/php/log/php-fpm.log.slow
slowlog = /usr/local/php/log/php-fpm.log.slow

加上慢执行日志后，我们可以很容易从慢执行日志中看出问题所在，比如：

[13-May-2013 05:17:12]  [pool www] pid 13557                                                                                                                    
script_filename = /opt/www/inkebook/index.php                                                                                                                   
[0x000000000292e0f0] commit() /opt/www/inkebook/includes/database/mysql/database.inc:166                                                                        
[0x000000000292de88] popCommittableTransactions() /opt/www/inkebook/includes/database/database.inc:1128                                                         
[0x000000000292dcf0] popTransaction() /opt/www/inkebook/includes/database/database.inc:1905                                                                     
[0x00007fffe78cc460] __destruct() unknown:0                                                                                                                     
[0x000000000292c690] execute() /opt/www/inkebook/modules/statistics/statistics.module:73                                                                        
[0x00007fffe78cc900] statistics_exit() unknown:0                                                                                                                
[0x000000000292c208] call_user_func_array() /opt/www/inkebook/includes/module.inc:857                                                                           
[0x000000000292bf10] module_invoke_all() /opt/www/inkebook/includes/common.inc:2688                                                                             
[0x000000000292ade0] drupal_page_footer() /opt/www/inkebook/includes/common.inc:2676                                                                            
[0x000000000292aa28] drupal_deliver_html_page() /opt/www/inkebook/includes/common.inc:2560                                                                      
[0x000000000292a378] drupal_deliver_page() /opt/www/inkebook/includes/menu.inc:532                                                                              
[0x000000000292a198] menu_execute_active_handler() /opt/www/inkebook/index.php:21

 再进行进一步的程序分析，就更具方向性了。

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