I see in many cases memcached is used. Can you give examples when to avoid memcached other than large files? How large files are appropriate for memcached?
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If you know when to bust the caches to prevent out-of-date things from being cached, there’s not really a reason to avoid memcache for anything small unless it’s so trivial to compute that it’d be approximately as long to hit memcache as it would to just compute it.