Description:
------------
client script：
<?php
   file_get_contents("http://localhost:8080/slow.php");


server script

<?php
/*slow.php*/
sleep(10);
echo "this is slow.php";

Test script:
---------------
client script：
<?php
   file_get_contents("http://localhost:8080/slow.php");


server script

<?php
/*slow.php*/
sleep(10);
echo "this is slow.php";


Expected result:
----------------
the cpu idle is still high

Actual result:
--------------
the cpu idle is still high,not slow any more