memcached is a high-performance general-purpose distributed memory object caching system, generic in nature, but intended to speed up dynamic Web applications by alleviating database load. The memcached server and clients work together to implement one global cache across as many machines as you have.
This application is based on libevent to scale to any size needed, and is specifically optimized to avoid swapping and always use non-blocking I/O.
This software is used by many major websites to alleviate database load and therefore yield faster page load times, with improved resource utilization. Notable examples include Facebook, Twitter, LiveJournal, YouTube, Reddit, Zynga, Digg, Craigslist, Flickr, and Heroku. Any high traffic site that is dynamically generated with a high database load will benefit from running memcached.
- Distributed cache – spread the cache over multiple systems.
- Ability to massively scale out.
- Uses a client–server architecture.
- Two-stage hash approach.
- Provides a giant hash table.
- Threaded operation mode which allows memcached to utilize more than a single CPU and share the cache between all of them.
- Implemented as a non-blocking event-based server.
- Can use SASL authentication support.
- Runs as a standalone service.
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