dotnet core ubuntu正在打开超过2万个文件

Question

我正在nginx后面运行一个dotnet核心应用程序，我只是通过运行此命令发现它当前已打开2万多个文件

function printTable($min, $max) {
    $res = '';

    $res .= "<table border='1'>";

    $res .= '<tr><th>x</th>';

    for($num = $min; $num <= $max; $num = $num + 1) 
        $res .= "<th>$num</th>";

    $res .= '</tr>';

    for($num = $min; $num <= $max; $num = $num + 1) {
        echo "<tr>";

        for($multBy = $min; $multBy <= $max; $multBy = $multBy + 1) {
            if($multBy==$min) {
                $res .= "<th>$multBy</th>";
            }

            $total = $num * $multBy;
            $res .= "<td>$total</td>";
        }

        $res .= "</tr>";
    }

    $res .= "</table>";
}

echo printTable(1, 12);

我应该为此担心吗？如何减少此数字以获得更好的IO性能？