Custom Redis Command: Performance of C vs Lua
Over the last few days, we've been writing a custom Redis command in C. The command, xdiff, is tailored to a specific use-case: diff'ing a set from a sorted set with an offset and count. A reasonable question is: why not just write it in Lua? Keeping in mind the dangers of such synthetic benchmarks, I decided to compare the C implementation to one written in Lua. The full C implementation can be s
Data Modeling In Redis
When you first start using Redis you probably see it with a fairly narrow perspective. Maybe you're thinking of it for caching, or you are looking to its sets to maintain a unique list, like tags. The more you use it, the more you find it useful. Up until now, I've always used Redis to implement specific features (or parts of a feature). I've used it for ranking, real time statistics, simple queue
Redis: Zero to Master in 30 minutes - Part 1
More than once, I've said that learning Redis is the most efficient way a programmer can spend 30 minutes. This is a testament to both how useful Redis is and how easy it is to learn. But, is it true, can you really learn, and even master, Redis in 30 minutes? Let's try it. In this part we'll go over what Redis is. In the next, we'll look at a simple example. Whatever time we have left will be for
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