Compiling doctrine in symfony 1.4

Warning: This blog post was written a long time ago and might be no longer relevant.
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When profiling symfony 1.x applications hydrating Doctrine objects occurs to be one of the most time consuming operations. Recently I experienced something different. Loading ORM classes was one of the most expensive tasks. Usually such operations don't even show up during profiling.

Fortunately Doctrine comes with a special task which merges all its classes into one file. This way number of require statements is significantly reduced.

sfTaskExtraPlugin comes with doctrine:compile task for symfony (which is really a wrapper for doctrine script).

Note: mentioned application was deployed to the server suffering from several issues (i.e. invalid APC configuration). Those issues made class loading problem more visible. Nevertheless compilation played a role in improving overall performance.

sfTaskExtraPlugin installation

./symfony plugin:install sfTaskExtraPlugin

Doctrine Compilation

Following command will compile Doctrine classes into _lib/doctrine.compiled.php _file with only mySQL support:

./symfony doctrine:compile --driver=mysql lib/doctrine.compiled.php

Just like the output message will suggest we need to alter ProjectConfiguration class:

public function setup()
  // ...

  if ($this instanceof sfApplicationConfiguration && !$this->isDebug())
    require_once sfConfig::get('sf_lib_dir') . '/doctrine.compiled.php';

To make it all work we have to use the Doctrine_Core class and not Doctrine. The later will not be compiled.

Task works with the latest versions of symfony 1.3 and 1.4.