PHP - Profiler (With Xdebug)

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Table of Contents

1 - About

The profiler in Xdebug 2 outputs profiling information in the form of a cachegrind compatible file.

2 - Prerequisites

3 - Configuration

3.1 - Php

  • Open the active php.ini file.
  • Set the xdebug.profiler_enable directive to 1:
xdebug.profiler_enable = 1;
  • To enable toggling the profiler from the browser through control over debugger cookies, set the xdebug.profiler_enable_trigger directive to 1:
xdebug.profiler_enable_trigger = 1;
  • Define location for accumulating profiling snapshots by specifying the xdebug.profiler_output_dir directive.
xdebug.profiler_output_dir = "<output folder name>"
  • Specify the name of the file to store snapshots in through the value of the xdebug.profiler_output_name directive. 
xdebug.profiler_output_name = "cachegrind.out.%t-%s" 
; default: cachegrind.out.%p where %p is the name format specifier

The name should always be cachegrind.out with a supported format specifiers ??? Why not callgrind.what_youw_want.

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3.2 - Browser

Start the debugger with profiler enable. Starting The Debugger

With Firefox, you can use this plugin = Firefox the easiest xdebug

3.3 - Analyze

3.3.1 - kcachegrind

The format cachegrind can be read by kcachegrind :

3.3.2 - Intellij

  • Intellij > Tools | Analyze Xdebug Profiler Snapshot.

and you will see:

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