++++++++++++++++++++++++ Magento Profiler ++++++++++++++++++++++++

http://www.fabrizio-branca.de/magento-profiler.html

Profile cli scripts

To profile shell scripts like Mage_Shell_Compiler change code at the end of the file to:

$_GET['profile'] = true;
require_once   '../app/Mage.php';
Varien_Profiler::start("wrapper");
$shell = new Mage_Shell_Compiler();
$shell->run();
Varien_Profiler::stop("wrapper");
Mage::helper('aoe_profiler')->renderProfilerOutputToFile();

You will find html page with rendered profiler output in var/profile/{date}.html

Profile only slow requests in production

To profile slow requests in production you will need to modify index.php. Warning: This will have an impact on overall performance as the timers will be recorded for every request but only rendered for slow requests.

On the 2nd line, add:

$_slowRequestTime = 10.0;  // Set to FALSE to disable
if ($_slowRequestTime) $_start = microtime(TRUE);

Before Mage::run...) add:

if ($_slowRequestTime) Varien_Profiler::enable();

After Mage::run(...) add:

if ($_slowRequestTime) {
    $_elapsed = microtime(true) - $_start;
    if ($_elapsed > $_slowRequestTime) {
        $_uri = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : 'unknown';
        $_profileName = Mage::helper('aoe_profiler')->renderProfilerOutputToFile($_uri);
        // Log, email, etc..
        Mage::log("Request for $_uri took $_elapsed seconds. See profiler output in $_profileName", Zend_Log::INFO, 'slow_requests.log');
    }
}