MonitorUtility.php

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<?php
namespace TYPO3\CMS\Core\Utility;

class MonitorUtility {

    static public function peakMemoryUsage() {
        $peakUsage = memory_get_peak_usage(TRUE);
        $memoryLimit = \TYPO3\CMS\Core\Utility\GeneralUtility::getBytesFromSizeMeasurement(ini_get('memory_limit'));
        if (is_double($memoryLimit) && $memoryLimit != 0) {
            if ($peakUsage / $memoryLimit >= 0.9) {
                $registry = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Registry');
                $data = array(
                    'used' => $peakUsage,
                    'tstamp' => $GLOBALS['EXEC_TIME'],
                    'url' => \TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('TYPO3_REQUEST_URL')
                );
                $registry->set('core', 'reports-peakMemoryUsage', $data);
            }
        }
    }

}