Description:
------------
I wrote a test script, when I request it in high concurrent 
connections(about 200c/s),php process cause high cpu 
usage(about 25% 
usage on 1.6G Xeon * 2's server).

follow is the script code:
<?
 $mem = $dbm->getMemcached();

 $in = "testword!";
 $mem->set("DDDFFD",$in);

 for($i=0;$i<100;$i++)
 {
        $out = $mem->get("DDDFFD");
        echo $i.":".$out."<BR>";
 }
?>

My project must using the get method many times to catch the 
data in 
php script, project's script can't support enough concurrent 
connections.

Does this issue happen because libmemcached or 
php_memcached?