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##########################
Profiling Your Application
##########################
The Profiler Class will display benchmark results, queries you have run,
and ``$_POST`` data at the bottom of your pages. This information can be
useful during development in order to help with debugging and
optimization.
Initializing the Class
======================
.. important:: This class does NOT need to be initialized. It is loaded
automatically by the :doc:`Output Library <../libraries/output>`
if profiling is enabled as shown below.
Enabling the Profiler
=====================
To enable the profiler place the following line anywhere within your
:doc:`Controller <controllers>` methods::
$this->output->enable_profiler(TRUE);
When enabled a report will be generated and inserted at the bottom of
your pages.
To disable the profiler you will use::
$this->output->enable_profiler(FALSE);
Setting Benchmark Points
========================
In order for the Profiler to compile and display your benchmark data you
must name your mark points using specific syntax.
Please read the information on setting Benchmark points in the
:doc:`Benchmark Library <../libraries/benchmark>` page.
Enabling and Disabling Profiler Sections
========================================
Each section of Profiler data can be enabled or disabled by setting a
corresponding config variable to TRUE or FALSE. This can be done one of
two ways. First, you can set application wide defaults with the
*application/config/profiler.php* config file.
Example::
$config['config'] = FALSE;
$config['queries'] = FALSE;
In your controllers, you can override the defaults and config file
values by calling the ``set_profiler_sections()`` method of the
:doc:`Output Library <../libraries/output>`::
$sections = array(
'config' => TRUE,
'queries' => TRUE
);
$this->output->set_profiler_sections($sections);
Available sections and the array key used to access them are described
in the table below.
======================= =================================================================== ========
Key Description Default
======================= =================================================================== ========
**benchmarks** Elapsed time of Benchmark points and total execution time TRUE
**config** CodeIgniter Config variables TRUE
**controller_info** The Controller class and method requested TRUE
**get** Any GET data passed in the request TRUE
**http_headers** The HTTP headers for the current request TRUE
**memory_usage** Amount of memory consumed by the current request, in bytes TRUE
**post** Any POST data passed in the request TRUE
**queries** Listing of all database queries executed, including execution time TRUE
**uri_string** The URI of the current request TRUE
**session_data** Data stored in the current session TRUE
**query_toggle_count** The number of queries after which the query block will default to 25
hidden.
======================= =================================================================== ========
.. note:: Disabling the (save_queries)[http://ellislab.com/codeigniter/user-guide/database/configuration.html] setting in your database configuration
will also effectively disable profiling for database queries and render
the 'queries' setting above useless. You can optionally override this
setting with `$this->db->save_queries = TRUE;`. Without this setting you
won't be able to view the queries or the (last_query)[http://ellislab.com/codeigniter/user-guide/database/helpers.html].
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