WorkerPool.php
private static function findGetconf()
    {
        $finder = new ExecutableFinder();
        $getconfPath = $finder->find('getconf');
        if ($getconfPath === null) {
            throw new Exception\RuntimeException('Unable to find the "getconf" executable.');
        }

        return $getconfPath;
    }
private static function findGetconf()
    {
        $finder = new ExecutableFinder();
        $getconfPath = $finder->find('getconf');
        if ($getconfPath === null) {
            throw new Exception\RuntimeException('Unable to find the "getconf" executable.');
        }

        return $getconfPath;
    }
@throws Exception\RuntimeException

@return string