$start = microtime(true);
        $num = 1000;
        $step = 10000;
        $count = $step * $num;
        for ($i = 0; $i < $num; $i++) {
            $items = [];
            for ($j = 0; $j < $step; $j++) {
                $items[] = [
                    'name' => uniqid(),
                    'created' => Carbon::now()->format('Y-m-d H:i:s'),
                ];
            }
            Db::table('users')->insert($items);
        }
        $end = microtime(true);
        $output->writeln("insert " . $count/10000 . "w, use " . round($end - $start, 2) . 's');