When should I use Memcache instead of Memcached

Question

It seems that PHP has two memcached libraries named memcache and memcached  What is the difference and how do you know which one to use  Is one outdated  It seems that memcached offers more methods so I would assume that means it has had the most development - but it also seems to require external C C   libraries so I m not sure if I can install it   It seems that memcache has been around longer  does not require additional libraries  and has pre-compiled binaries for even windows  I would think that it would be the better choice for now  However  being new to memcached  server  I m not sure if there is some super important features in memcached  php  that make it worth the extra trouble

User · Answer

When using Windows  the comparison is cut short  memcache appears to be the only client available

User · Answer

This is 2013   Forget about the 2009 comments   Likewise  if you are running serious traffic loads  do not even contemplate how to make-do with a windows based memcache  When dealing with a very large scale  500  front end web servers  and 20  back end database servers and replicants  mysql  amp  mssql mix   a farm of memcached servers  12 servers in group  supports multiple high volume OLTP applications answering 25K   40K mc- get calls per-second   These calls are those that do NOT have to reach a database   IMHO  this use of memcached provided SERIOUS        savings on CAPEX for new DB servers  amp  licences as well as on support contracts for large commercial designs

User · Answer

Memcached is a newer API  it also provides memcached as a session provider which could be great if you have a farm of server    After the version is still really low 0 2 but I have used both and I didn t encounter major problem  so I would go to memcached since it s new

User · Answer

Memcached client library was just recently released as stable  It is being used by digg   was developed for digg by Andrei Zmievski  now no longer with digg  and implements much more of the memcached protocol than the older memcache client  The most important features that memcached has are    Cas tokens  This made my life much easier and is an easy preventive system for stale data  Whenever you pull something from the cache  you can receive with it a cas token  a double number   You can than use that token to save your updated object  If no one else updated the value while your thread was running  the swap will succeed  Otherwise a newer cas token was created and you are forced to reload the data and save it again with the new token  Read through callbacks are the best thing since sliced bread  It has simplified much of my code  getDelayed   is a nice feature that can reduce the time your script has to wait for the results to come back from the server  While the memcached server is supposed to be very stable  it is not the fastest  You can use binary protocol instead of ASCII with the newer client  Whenever you save complex data into memcached the client used to always do serialization of the value  which is slow   but now with memcached client you have the option of using igbinary  So far I haven t had the chance to test how much of a performance gain this can be    All of this points were enough for me to switch to the newest client  and can tell you that it works like a charm  There is that external dependency on the libmemcached library  but have managed to install it nonetheless on Ubuntu and Mac OSX  so no problems there so far   If you decide to update to the newer library  I suggest you update to the latest server version as well as it has some nice features as well  You will need to install libevent for it to compile  but on Ubuntu it wasn t much trouble   I haven t seen any frameworks pick up the new memcached client thus far  although I don t keep track of them   but I presume Zend will get on board shortly   UPDATE  Zend Framework 2 has an adapter for Memcached which can be found here

[php] When should I use Memcache instead of Memcached?

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