PHP performance analysis: usage of php-fpm slow execution log slow log

This article mainly introduces the usage of php-fpm slow execution log of php performance analysis. It analyzes the function and related usage skills of php slow execution log in the form of examples. Friends in need can refer to it

As we all know, mysql has slow query log. According to the slow query log, we can know which SQL statements have performance problems. As a good partner of mysql, php also has such a function. If you use php-fpm to manage php, you can enable it through the following options.

The settings before PHP 5.3.3 are as follows:

<value name="request_slowlog_timeout">5s</value>
<value name="slowlog">logs/php-fpm-slowlog.log</value>

The settings after PHP 5.3.3 are as follows ：

request_slowlog_timeout = 5s
slowlog = /usr/local/php/log/php-fpm-slowlog.log

Description:

request_slowlog_timeout is how long the script can record To the log file
slowlog is the path of the log file

After it is turned on, if a script is executed for more than the specified time, information similar to the following will be written in the specified log file:

[19-Dec-2013 16:54:49] [pool www] pid 18575
script_filename = /home/admin/web/htdocs/sandbox_canglong/test/tt.php
[0x0000000003a00dc8] curl_exec () /home/admin/web/htdocs/sandbox_canglong/test/tt.php:2
[0x0000000003a00cd0] exfilter_curl_get() /home/admin/web/htdocs/sandbox_canglong/test/tt.php:6

Log description:

script_filename is the entry file
curl_exec(): It means that the execution time exceeds when executing this method.
exfilter_curl_get(): Description The method of calling curl_exec() is exfilter_curl_get().

The number after the colon on each line is the line number.

After it is turned on, there are also relevant records in the error log file. As follows:

[19-Dec-2013 15:55:37] WARNING: [pool www] child 18575, script '/home/admin/web/htdocs/sandbox_canglong/test/tt.php ' (request: "GET /test/tt.php") executing too slow (1.006222 sec), logging
[19-Dec-2013 15:55:37] NOTICE: child 18575 stopped for tracing
[19 -Dec-2013 15:55:37] NOTICE: about to trace 18575
[19-Dec-2013 15:55:37] NOTICE: finished trace of 18575

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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