Find WordPress performance bottlenecks with XDebug PHP profiling

Nov 23, 20160 likes2,089 views

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.

@ottokekalainen @Seravocom SERAVO.COM
Photo by Nicola Sapiens De Mitri
Optimizing WordPress performance
with XDebug and PHP profiling

@ottokekalainen @Seravocom SERAVO.COM
XDebug
a tool for developers to
analyze PHP execution
to find bottle necks
and anomalies

@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!

@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
...

@ottokekalainen @Seravocom SERAVO.COM
Webgrind installation example:
$ cd /data/wordpress/htdocs
$ git clone https://github.com/alpha0010/webgrind
$ sudo apt-get install graphviz

@ottokekalainen @Seravocom SERAVO.COM
Go profiling!

@ottokekalainen @Seravocom SERAVO.COM
Filter for usual suspects: load, open, curl, query

@ottokekalainen @Seravocom SERAVO.COM
Pinpoint the bottle neck

@ottokekalainen @Seravocom SERAVO.COM
Show call graph

$@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$

@ottokekalainen @Seravocom SERAVO.COM
Rinse and repeat!

@ottokekalainen @Seravocom SERAVO.COM
Now go and
fix your slow code!

@ottokekalainen @Seravocom SERAVO.COM
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FOSDEM2021: MariaDB post-release quality assurance in Debian and UbuntuOtto Kekäläinen

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DebConf 2020: What’s New in MariaDB Server 10.5 and Galera 4?Otto Kekäläinen

MariaDB has now reached the 10th major release since the original authors of MySQL started taking the code base in another direction than where MySQL is going under Oracle’s ownership. Today MariaDB has many more features than Oracle MySQL and it is the default MySQL variant in Debian. This presentation covers what new features landed in MariaDB 10.5 and also touches on how the long existing features have evolved to today, and naturally what is their state and best practices for Debian users. MariaDB has also built-in support for Galera master-master replication and Galera 4 has recently landed in Debian, so it will also be covered.

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How MariaDB packaging uses Salsa-CI to ensure smooth upgrades and avoid regre...Otto Kekäläinen

This document discusses how MariaDB in Debian uses the Salsa-CI/Gitlab-CI infrastructure to ensure smooth upgrades and avoid regressions. It describes how the MariaDB packaging repositories were moved to Salsa.Debian.org and how a custom Gitlab-CI pipeline with 18 jobs over 5 stages was created to build, test, and simulate upgrades from various versions. This comprehensive continuous integration process helps catch issues early and improve the quality and reliability of MariaDB upgrades. Challenges in testing such a large and complex package are also discussed.

DebConf 2019 MariaDB packaging in Debian BoFOtto Kekäläinen

This document discusses the state of MariaDB and MySQL packaging in Debian. MariaDB 10.3 is included in the latest stable Debian release, and 10.4 will be uploaded soon. MySQL 5.7 is available in unstable but not stable releases. There is ongoing work to maintain older MariaDB versions and develop new packages. Contributors are encouraged to participate in bug triage and discussions to help address stale bugs without coding skills.

The 5 most common reasons for a slow WordPress site and how to fix themOtto Kekäläinen

How to investigate and recover from a security breach in WordPressOtto Kekäläinen

This document summarizes Otto Kekäläinen's talk about investigating and recovering from a WordPress security breach at his company Seravo. On November 9th, 2018 four WordPress sites hosted by Seravo were compromised due to a vulnerability in the WP GDPR Compliance plugin. Seravo's security team launched an investigation that uncovered malicious user accounts, identified the vulnerable plugin as the entry point, and cleaned up the sites. The experience highlighted the importance of having an incident response plan even when security best practices are followed.

Technical SEO for WordPressOtto Kekäläinen

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MariaDB adoption in Linux distributions and development environmentsOtto Kekäläinen

Presentation given at the M|17 MariaDB User Conference 2017 https://m17.mariadb.com/ Linux, Apache, MySQL and PHP used to be the most widely used web application stacks. As technology evolves, this is no longer the case. For the M part, MariaDB has replaced MySQL in numerous Linux distributions and development environments, and is becoming the new M in most production environments as well. This talk presents how the landscape looks today, and why and how web developers are migrating to MariaDB around the globe.

DebConf16 BoF on MariaDB/MySQL packagingOtto Kekäläinen

The document discusses plans for MySQL and MariaDB packages in Debian. It notes that MariaDB will become the default over MySQL. It provides a list of tasks for improving the MariaDB packages, including adding tags, optional feedback plugins, systemd scripts, and autopkg tests. It also discusses some more difficult tasks such as reproducible builds and using an open-source SSL library instead of the bundled YaSSL.

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