Memcached ,a general-purpose distribute dmemory cachingsystem used to speed up dynamic database-driven websites

Memcached is a general-purpose distribute dmemory cachingsystem. It is often used to speed up dynamic database-driven websites by caching data and objects in RAM to reduce the number of times an external data source (such as a database or API) must be read. Memcached isfree and open-source software, licensed under theRevised BSD license. Memcached runs onUnix-likeoperating systems (at leastLinuxandOS X) and onMicrosoft Windows. It depends on the libevent library.

Memcached's APIs provide a very largehash table distributed across multiple machines. When the table is full, subsequent inserts cause older data to be purged inleast recently used(LRU) order.Applications using Memcached typically layer requests and additions into RAM before falling back on a slower backing store, such as a database.

Memcached was first developed by Brad Fitzpatrickfor his websiteLive Journal, on May 22, 2003.It was originally written in Perl, then later rewritten in C by Anatoly Vorobey, then employed by Live Journal.Memcached is now used by many other systems, including YouTube, Reddit, Facebook, Twitter,and Wikipedia.Google App Engine,Microsoft Azure,IBM Bluemix and Amazon Web Servicesalso offer a Memcached service through an API.

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