research!rsc: Go Data Structures
When explaining Go to new programmers, I've found that it often helps to explain what Go values look like in memory, to build the right intuition about which operations are expensive and which are not. This post is about basic types, structs, arrays, and slices. Basic types Let's start with some simple examples: The variable i has type int, represented in memory as a single 32-bit word. (All these
research!rsc: Hacking the OS X Kernel for Fun and Profiles
My last post described how user-level CPU profilers work, and specifically how Google’s pprof profiler gathers its CPU profiles with the help of the operating system. The specific feature needed from the operating system is the profiling timer provided by setitimer(2) and the SIGPROF signals that it delivers. If the operating system’s implementation of that feature doesn’t work, then the profiler
research!rsc: QArt Codes
QR codes are 2-dimensional bar codes that encode arbitrary text strings. A common use of QR codes is to encode URLs so that people can scan a QR code (for example, on an advertising poster, building roof, volleyball bikini, belt buckle, or airplane banner) to load a web site on a cell phone instead of having to “type” in a URL. QR codes are encoded using Reed-Solomon error-correcting codes, so tha
QArt Coder
URL: Tip: Short URLs work best. Tip: Small, high contrast images work best. (The image is not uploaded anywhere; this page executes entirely in your browser.)
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