public static function end($endToken = 'cygnite_start')
    {
        $html = '';
        $html .= "<div id='benchmark'><div class='benchmark'>Total elapsed time : ".round(self::getTime() - self::$blocks[$endToken], 3).' s';
        //$html .= self::getMemoryPeakUsage();
        $html .= ' &nbsp;&nbsp; &nbsp;Total memory :'.self::getMemorySpaceUsage().'</div></div>';
        echo $html;
    }