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    <ol> <li><p>nginx page-level caching is good for caching static content. But for dynamic content, it's no good. For example, how do you invalidate cache if the content is changed in the upstream?</p></li> <li><p>Redis is perfect for in-memory data store. But I don't like to use it as cache. With limited amount of memory, I have to constantly worry about running out of memory. Yes you can set up strategy for expiring keys in redis. But that's extra work and still not as good as I want it to be a cache provider.</p></li> </ol> <p>Have no experience on choices 3 and 4.</p> <p>I'm surprised that you don't include memcache here as an option. From my experience, it's solid as a cache provider. One memcache feature that redis doesn't have is that it doesn't guarantee that a key won't be expired by the expiry time you specified. This is bad for a data store, but it makes memcache a perfect candidate for caching: you don't need to worry about using up memory you assigned to memcache. memcache will delete less used keys (the cache less used) even though the expiry time of those keys are not met yet.</p> <p>Nginx provides this build-in <a href="http://wiki.nginx.org/HttpMemcachedModule" rel="nofollow">memcache module</a>. It's solid. A number of tutorials if you google online.</p> <p>This one I like the most (see link below). Cache invalidation is easy: for example, if a page is updated in upstream, just delete the memcache key from the upstream app server. The author claimed 4x increase of the response time. Believe it's good enough for your use case.</p> <p><a href="http://www.igvita.com/2008/02/11/nginx-and-memcached-a-400-boost/" rel="nofollow">http://www.igvita.com/2008/02/11/nginx-and-memcached-a-400-boost/</a></p>
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    1. POWhich method of caching is the fastest/lightest for Node/Mongo/NginX?
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    1. USChuan Ma
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