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home 16 Oct 2014 - By Karl Seguin I realized something recently: I know virtually nothing about UDP. Oh, I know it's connectionless, has no handshaking and thus doesn't provide any guarantees about delivery or ordering. But, in practice, what does that actually mean? I setup 5 VPS to send each other a few UDP packets over a 7 hour period. I didn't send much traffic (though that's certainly worth trying). Each server, every 9-11 second, randomly picked a target and sent 5-10 packets ranging from 16 to 1016 bytes. 2 servers were in the same data center in New Jersey. 1 each in LA, Amsterdam and Tokyo. The first thing I wanted to know was how unreliable UDP was. Are we talking about a delivery rate of 25%? 50%? 75%? Packets Received - click table to toggle % Receiver NJ 1 NJ 2 LA NLD JPN NJ 1 - 2981/2981 2888/2889 2964/2964 3053/3054 NJ 2 3016/3016 - 3100/310...
home 18 Sep 2013 - By Karl Seguin The worst kept secret about unit testing in general, and TDD specifically, is that it's primarily a design activity with future correctness as a side effect. Unit tests don't uncover all design problems, but they are effective with respect to cohesion and coupling issues and the rather significant principals that relate to these. One thing I've noticed from programmers who've spent most of their lives with dynamic languages is that, even after years, they've rarely learned the basic design lessons unit testing teaches. Why? Because the very nature of dynamic languages mean that decoupling is a language facility as opposed to a design concern. Why go through the hassle of using various inversion of control approaches and frameworks when you can rewrite the behavior of any thing, at any time. I'm no fan of the ceremony surrounding Inversion of Control a...
home 16 Oct 2014 - By Karl Seguin I realized something recently: I know virtually nothing about UDP. Oh, I know it's connectionless, has no handshaking and thus doesn't provide any guarantees about delivery or ordering. But, in practice, what does that actually mean? I setup 5 VPS to send each other a few UDP packets over a 7 hour period. I didn't send much traffic (though that's certainly worth trying). Each server, every 9-11 second, randomly picked a target and sent 5-10 packets ranging from 16 to 1016 bytes. 2 servers were in the same data center in New Jersey. 1 each in LA, Amsterdam and Tokyo. The first thing I wanted to know was how unreliable UDP was. Are we talking about a delivery rate of 25%? 50%? 75%? Packets Received - click table to toggle % Receiver NJ 1 NJ 2 LA NLD JPN NJ 1 - 2981/2981 2888/2889 2964/2964 3053/3054 NJ 2 3016/3016 - 3100/310...