Slow PHP Session


Slow PHP Session



A basic page page with just session_start(); loads just fine, but once I've set something, for example $_SESSION['pet']="dog";, the page load time is around 5 seconds.


session_start();


$_SESSION['pet']="dog";



I'm using AWS's memcached server and the connection time to it from the EC2 instance is really fast. I'm not sure where the slow down is coming from.



The session.save_handler is set to memcached and session.save_path is set to xxx.cfg.use1.cache.amazonaws.com:11211



phpinfo also displays Registered save handlers as files user memcache memcached



EDIT :
I uploaded test files to demonstrate the issue. The first file is simply session_start(); print_r($_SESSION); (http://rr915webapi.us-east-1.elasticbeanstalk.com/session.php). The second file is session_start();$_SESSION['pet']="dog";$_SESSION['name']="bob";(http://rr915webapi.us-east-1.elasticbeanstalk.com/session-set.php). After you load the second file, you can see the first takes a while longer to load than initially did.


session_start(); print_r($_SESSION);


session_start();$_SESSION['pet']="dog";$_SESSION['name']="bob";





Is the session stored in memcache or on disk?
– Lawrence Cherone
Jul 2 at 19:46





I've set the session.save_handler to memcached and session.save_path to the ElastiCache instance - Under session it lists Registered save handlers: files user memcache memcached
– austinhollis
Jul 2 at 19:50






Is there a way to check if it's truely using the memcached server?
– austinhollis
Jul 2 at 20:08





@austinhollis php.net/manual/en/function.session-save-path.php you can also just dump <?php phpinfo(); into a file and it will dump your config to a readable page.
– Neil Masters
Jul 2 at 20:15






@NeilMasters I did do that and didn't know if the order of Registered save handlers meant it was using something other than the session.save_path that is specified
– austinhollis
Jul 2 at 20:20




2 Answers
2



Some possibilities :



if your PHP server running your PHP code and your memcached server / cfg.use1.cache.amazonaws.com are hosted on different regions, it can explain all this time...



there seems to be a a bug in libmemcached 1.0.16...if you update to 1.0.18, will fix the problem, see https://github.com/iuscommunity/wishlist/issues/143 comments and https://bugs.launchpad.net/libmemcached/+bug/1589344





They're both in us-east-1, but they are in different zones. Would that still make a difference?
– austinhollis
Jul 3 at 1:40





I just moved the EC2 instance to us-east-1b to see if that would make a difference, but I'm still getting the same 5 seconds until the first byte
– austinhollis
Jul 3 at 2:08





i've updated my answer with libmemcached 1.0.16 issue...
– Pierre
Jul 3 at 5:39



By setting the following in the PHP ini file, the response time was reduced down to milliseconds.


session.lazy_write = 0
memcached.sess_locking = Off






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