symfony/src/Symfony/Bundle/FrameworkBundle/Resources/config/profiling.xml

<?xml version="1.0" ?>

<container xmlns="http://www.symfony-project.org/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.symfony-project.org/schema/dic/services http://www.symfony-project.org/schema/dic/services/services-1.0.xsd">

    <parameters>
        <parameter key="profiler.class">Symfony\Bundle\FrameworkBundle\Profiler</parameter>
        <parameter key="profiler.storage.class">Symfony\Components\HttpKernel\Profiler\ProfilerStorage</parameter>
        <parameter key="profiler.storage.file">%kernel.cache_dir%/profiler.db</parameter>
        <parameter key="profiler.storage.lifetime">86400</parameter>
        <parameter key="profiler_listener.class">Symfony\Components\HttpKernel\Profiler\ProfilerListener</parameter>
    </parameters>

    <services>
        <service id="profiler" class="%profiler.class%">
            <argument type="service" id="service_container" />
            <argument type="service" id="profiler.storage" />
            <argument type="service" id="logger" on-invalid="null" />
        </service>

        <service id="profiler.storage" class="%profiler.storage.class%">
            <argument>%profiler.storage.file%</argument>
            <argument>null</argument>
            <argument>%profiler.storage.lifetime%</argument>
        </service>

        <service id="profiler_listener" class="%profiler_listener.class%">
            <annotation name="kernel.listener" />
            <argument type="service" id="profiler" />
        </service>
    </services>
</container>