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Profiling with PHP

Sven Assmann
Polyglot software engineer, since 2006 mainly on web technologies. Like to explore new things and toy around with languages, frameworks and problems. 🦀 he/him
Updated on ・1 min read

There are basically 3 simple steps how to get to a profiling of your application to get performance insights.

1. Step xdebug setup

Check if your installation has xdebug support enabled:

-bash-4.1$ php --info | grep -i xdebug | grep enabled
xdebug support => enabled
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if that does not show anything then checkout the Manual

if it does not show enabled then checkout your php.ini and enable the extension.

2. Step create this bash alias

alias php-profile='php -d xdebug.profiler_enable=on -d xdebug.profiler_output_name=profile.out -d xdebug.profiler_output_dir=$PWD'
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3. Step create a PHPUnit test case that exercise your code

this is pretty simple as this snipped will illustrate it on a DNA class with the method hammingDistance that is our bottle neck to be profiled:

// filename: DNATest.php

require_once __DIR__.'/DNA.php';

final class DNATest extends \PHPUnit\Framework\TestCase
{
    public function test()
    {
        $dna = new DNA('GGACT');
        $distance = $dna->hammingDistance(new DNA('CGACT'));
        $this->assertThat($distance, $this->equalTo(1));
    }
}
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Finally run the profiling

run the profiling this way (assuming you have the phpunit.phar there):

php-profile phpunit.phar DNATest.php
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That will

  • run the test
  • produces a profile.out

That file contains all profiling data. It can be opened by PHPStorm or QCacheGrind.

However now you got a bunch of metrics, you need to first ignore all the profiling of PHPUnit and find the start of the invocation of your code.

What other approaches do you use to get profiling?
Please share your experience.

Thanks for reading!

Discussion (2)

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aleksikauppila profile image
Aleksi Kauppila

Good stuff, thanks! I ran this against a test suite and made valuable discoveries 👍

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5422m4n profile image
Sven Assmann Author

That makes me happy, thanks for sharing that.