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I have a Joomla site causing very high (php) load on the server. I have already ran the MySQL slow log feature and it doesn't appear to be MySQL.

What are some ways to analyze a Joomla site to determine what causes the high php load?

Example of highest processes for the day:

testing1    testing1.com    27.32   0.53    0.3
Top Process %CPU 179    /usr/bin/php /home/testing1/public_html/index.php
Top Process %CPU 138    /usr/bin/php /home/testing1/public_html/index.php
Top Process %CPU 137    /usr/bin/php /home/testing1/public_html/index.php

Using latest 1.5 Joomla on a CentOS server running Apache/MySQL. I have full/root access to this server, so whatever tools are needed I can install.

I know the general idea is that a number of 3rd-party components are probably causing this, but how can I determine which ones (without removing/disabling them)?

Zeno
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1 Answers1

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It's still going to be hard diagnosing the problem without disabling suspected components (diagnosing performance problems is like diagnosing any other sort of problem; it's a process of elimination, which requires isolating/controlling different variables to test different hypotheses), but useful tools to have are:

  • Monitoring / visualization tools: e.g. dstat + gnuplot, log analyzers, etc.
  • Stress/load testing tools: e.g. httperf, Autobench, ApacheBench (ab), OpenWebLoad, etc.
  • Code profiling tools: e.g. Dbg, Xdebug, CodeAnalyst, Dtrace, pmp, or whatever profiling tools come with your app framework's debugging facilities.
  • Other: Aspera is basically a MySQL performance diagnostic toolkit used by Percona, but a lot of these tools have more general purpose usefulness, such as tools for profiling IO, for stack traces, for triggering a script or event when certain conditions are met, for drilling down collected data, etc. It provides a lot of the "glue" for an efficient diagnostic workflow.
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