Redis can be run without persistence, at which point it can be treated as Memcached with extra features (optimistic locking, data structures, etc). Without persistence, performance is often comparable (even with persistence, performance can be comparable, but you're more at the mercy of the IO subsystem).
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Redis can be run without persistence, at which point it can be treated as Memcached with extra features (optimistic locking, data structures, etc). Without persistence, performance is often comparable (even with persistence, performance can be comparable, but you're more at the mercy of the IO subsystem).