public function getFillingPercentage()
    {
        $mem = wincache_ucache_meminfo();
        $memSize = $mem['memory_total'];
        $memUsed = $memSize - $mem['memory_free'];
        if ($memSize == 0) {
            Zend_Cache::throwException('can\'t get WinCache memory size');
        }
        if ($memUsed > $memSize) {
            return 100;
        }
        return ((int) (100. * ($memUsed / $memSize)));
    }