Find WordPress performance bottlenecks with XDebug PHP profiling
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XDebug is a tool that allows developers to profile PHP applications to identify bottlenecks and anomalies. It works by instrumenting PHP code during execution and collecting metrics on runtime performance. The document provides instructions on installing XDebug, taking profiling samples of a WordPress site, and analyzing the results with Webgrind to identify expensive functions and optimize performance. With repeated profiling and analysis, developers can pinpoint specific code causing issues and refactor it for better efficiency.
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Find WordPress performance bottlenecks with XDebug PHP profiling
- 1. @ottokekalainen @Seravocom SERAVO.COM Photo by Nicola Sapiens De Mitri Optimizing WordPress performance with XDebug and PHP profiling
- 2. @ottokekalainen @Seravocom SERAVO.COM XDebug a tool for developers to analyze PHP execution to find bottle necks and anomalies
- 3. @ottokekalainen @Seravocom SERAVO.COM Xdebug installation example: $ sudo apt-get install php-xdebug $ nano /etc/php/fpm/conf.d/20-xdebug.ini ; Enable xdebug zend_extension=xdebug.so ; Enable php profiling with get param XDEBUG_PROFILE=1 xdebug.profiler_output_dir=/tmp xdebug.profiler_output_name=cachegrind.out.%t.%p xdebug.profiler_enable_trigger=1 $ sudo service restart php-fpm Do this in your development environment, e.g. Vagrant image. Don't use production site, XDebug makes the site much slower!
- 4. @ottokekalainen @Seravocom SERAVO.COM Profiling run of WordPress front page /tmp $ curl -I http://example.com/?XDEBUG_PROFILE=1 /tmp $ ll -h 11M cachegrind.out.1455198789.5601 /tmp $ head cachegrind.out.1455198789.5601 version: 1 creator: xdebug 2.2.3 cmd: /data/wordpress/htdocs/index.php part: 1 positions: line events: Time fl=php:internal ...
- 5. @ottokekalainen @Seravocom SERAVO.COM Webgrind installation example: $ cd /data/wordpress/htdocs $ git clone https://github.com/alpha0010/webgrind $ sudo apt-get install graphviz
- 6. @ottokekalainen @Seravocom SERAVO.COM Go profiling!
- 9. @ottokekalainen @Seravocom SERAVO.COM Filter for usual suspects: load, open, curl, query
- 10. @ottokekalainen @Seravocom SERAVO.COM Pinpoint the bottle neck
- 11. @ottokekalainen @Seravocom SERAVO.COM Show call graph
- 12. @ottokekalainen @Seravocom SERAVO.COM Hunt down that rare beast: $ export LANG=C; for i in {1..99}; do curl -IL -H "Pragma: no-cache" -w "%{time_total}n" -o /dev/null -s "http://wp-esittely.wp-palvelu.fi/?XDEBUG_PROFILE=1"; done $ ll -Sh /tmp -rw-r--r-- 111M helmi 11 16:29 cachegrind.out.1455200976.5601 -rw-r--r-- 91M helmi 11 16:29 cachegrind.out.1455200984.5601 -rw-r--r-- 89M helmi 11 16:29 cachegrind.out.1455200972.5604 -rw-r--r-- 89M helmi 11 16:29 cachegrind.out.1455200964.5604 -rw-r--r-- 88M helmi 11 16:29 cachegrind.out.1455200973.5604 -rw-r--r-- 87M helmi 11 16:29 cachegrind.out.1455200963.5601 -rw-r--r-- 87M helmi 11 16:29 cachegrind.out.1455200967.5601
- 13. @ottokekalainen @Seravocom SERAVO.COM Rinse and repeat!
- 14. @ottokekalainen @Seravocom SERAVO.COM Now go and fix your slow code!
- 15. @ottokekalainen @Seravocom SERAVO.COM PROFESSIONAL UPKEEP FOR WORDPRESS Thank You!