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Reverse Engineering Apple Location Services Protocol

While working on Whereami I got interested on how Apple location services actually work. I know it is handled by locationd since Little Snitch keeps blocking it. Usual way of inspecting traffic with proxychains did not work since macOS now has something called System Integrity Protection (SIP).

CPU Utilization is Wrong

The metric we all use for CPU utilization is deeply misleading, and getting worse every year. What is CPU utilization? How busy your processors are? No, that's not what it measures. Yes, I'm talking about the "%CPU" metric used everywhere, by everyone. In every performance monitoring product. In top(1).

SQL Notebook

SQL Notebook is a free Windows app for exploring and manipulating tabular data. It is powered by a supercharged SQLite engine, supporting both standard SQL queries and SQL Notebook-specific commands. Everything you need to answer analysis questions about your data, regardless of its format or origin, is built into SQL Notebook.

The tragedy of 100% code coverage

It is funny how things turn around. ​ For fifteen years I have been preaching TDD (Test-driven development, or as it used to be called: test-first approach), or at least for developers to write some unit tests. However, in recent times I have found myself saying more often, "Why did you write that test?" instead of, "You should write a test."

How do Multiplayer Game sync their state?

In part 1 of the series, we discussed the following: Challenges faced in multiplayer game and how to solve unresponsive UI by client predictions. I did however gloss over essential server implementation details, which we will focus on in this article.

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