$so=0;
$time1=date();
while($so<10000){
$get=file("http://yoururl or localhost/path/file.php");
$so++;
if(!ereg("\",($so/10)) echo "<SCRIPT>window.open('$PHP_SELF');</SCRIPT>";
}
$time2=date();
echo "Started: $time1 , Ended $time2 , Executed $so";
Opens new window on each set dividable by 10.