code/Debug/Model/Observer.php
public function startProfiling()
    {
        // Magento configuration is now available and we can init
        $this->canCapture = Mage::helper('sheep_debug')->canCapture();

        // Are we still allowed to collect
        if (!$this->canCapture) {
            return;
        }


        $requestInfo = $this->getRequestInfo();
        $requestInfo->setIsStarted(true);

        // Register shutdown function
        $this->registerShutdown();


        // Init profile
        $requestInfo->setStoreId($this->getCurrentStore()->getId());
        $requestInfo->setDate(date('Y-m-d H:i:s'));
        $requestInfo->initController();
        $requestInfo->initLogging();

        if (Mage::helper('sheep_debug')->canEnableVarienProfiler()) {
            Varien_Profiler::enable();
        }

        // use customer Zend Db Profiler that also records stack traces
        $stackTraceProfiler = Mage::getModel('sheep_debug/db_profiler');
        $stackTraceProfiler->setCaptureStacktraces(Mage::helper('sheep_debug')->canEnableSqlStacktrace());
        $stackTraceProfiler->replaceProfiler();
    }
public function startProfiling()
    {
        // Magento configuration is now available and we can init
        $this->canCapture = Mage::helper('sheep_debug')->canCapture();

        // Are we still allowed to collect
        if (!$this->canCapture) {
            return;
        }


        $requestInfo = $this->getRequestInfo();
        $requestInfo->setIsStarted(true);

        // Register shutdown function
        $this->registerShutdown();


        // Init profile
        $requestInfo->setStoreId($this->getCurrentStore()->getId());
        $requestInfo->setDate(date('Y-m-d H:i:s'));
        $requestInfo->initController();
        $requestInfo->initLogging();

        if (Mage::helper('sheep_debug')->canEnableVarienProfiler()) {
            Varien_Profiler::enable();
        }

        // use customer Zend Db Profiler that also records stack traces
        $stackTraceProfiler = Mage::getModel('sheep_debug/db_profiler');
        $stackTraceProfiler->setCaptureStacktraces(Mage::helper('sheep_debug')->canEnableSqlStacktrace());
        $stackTraceProfiler->replaceProfiler();
    }
Called to mark that we can start profile execution of specified request