开启php-fpm的慢日志

首先需要定位自己安装php目录，然后再etc/php-fpm.d目录下找到对应的配置文件，如我这里配置的为www.conf，文件中有如下信息：

; The log file for slow requests
; Default Value: not set
; Note: slowlog is mandatory if request_slowlog_timeout is set
;slowlog = log/$pool.log.slow

; 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 = 0

; Depth of slow log stack trace.
; Default Value: 20
;request_slowlog_trace_depth = 20

上面：

• slowlog：是需要存放慢日志的文件路径
• request_slowlog_timeout：慢日志的时间，如果为0表示不开启
• request_slowlog_trace_depth：慢日志跟踪的堆栈深度

开启慢日志必须要将slowlog和request_slowlog_timeout开启才行，slowlog设置后一定要在php的安装目录下新建一个log目录，否则重启会失败，所以这里我们只需要将前面的分号去掉即可，去掉后重启php-fpm即可。在log目录下多了一个www.log.slow的文件。

测试

我这里通过一个laravel项目中写了一个sleep(10);代码，然后运行，观察慢日志文件发现：

script_filename = /home/laravel/public/index.php
[0x00007f9c13822000] sleep() /home/laravel/app/Http/Controllers/TestController.php:39
[0x00007f9c13821930] index() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
[0x00007f9c138218c0] call_user_func_array() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
[0x00007f9c13821820] callAction() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:45
[0x00007f9c13821720] dispatch() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/Route.php:212
[0x00007f9c13821680] runController() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/Route.php:169
[0x00007f9c13821590] run() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/Router.php:658
[0x00007f9c13821480] Illuminate\Routing\{closure}() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php:30
[0x00007f9c138213b0] Illuminate\Routing\{closure}() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php:41
[0x00007f9c138212a0] handle() /home/laravel/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php:149
[0x00007f9c13821090] Illuminate\Pipeline\{closure}() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php:53
[0x00007f9c13820f50] Illuminate\Routing\{closure}() /home/laravel/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php:68
[0x00007f9c13820cb0] handle() /home/laravel/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php:149
[0x00007f9c13820aa0] Illuminate\Pipeline\{closure}() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php:53
[0x00007f9c13820960] Illuminate\Routing\{closure}() /home/laravel/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php:49
[0x00007f9c13820850] handle() /home/laravel/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php:149
[0x00007f9c13820640] Illuminate\Pipeline\{closure}() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php:53
[0x00007f9c13820500] Illuminate\Routing\{closure}() /home/laravel/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php:63
[0x00007f9c138203a0] handle() /home/laravel/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php:149
[0x00007f9c13820190] Illuminate\Pipeline\{closure}() /home/laravel/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php:53

这样我们就很非常容易定位某个代码执行时间较长的位置。