seclorum seclorum

Make Ubuntu packages 90% faster by rebuilding them

TL;DR

You can take the same source code package that Ubuntu uses to build jq, compile it again, and realize 90% better performance.

Setting

I use jq for processing GeoJSON files and other open data offered in JSON format. Today I am working with a 500MB GeoJSON file that contains the Alameda County Assessor's parcel map. I want to run a query that prints the city for every parcel worth more than a threshold amount. The program is

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

Starting Points

How to use this gist

You've got two main options:

Use previous/older SDKs with Xcode

Since monterey update does not allow us to use Xcode previous than 13, let's show how to "install previous SDKs"

Needed

Swift toolchains, from https://swift.org/download/

Previous Xcode.xip, from the https://developer.apple.com

Linux Desktop on Apple Silicon in Practice

I bought M1 MacBook Air. It is the fastest computer I have, and I have been a GNOME/GNU/Linux user for long time. It is obvious conclusion that I need practical Linux desktop environment on Apple Silicon.

Fortunately, Linux already works on Apple Silicon/M1. But how practical is it?

Two native ports exist.

	#include <time.h> // Robert Nystrom
	#include <stdio.h> // @munificentbob
	#include <stdlib.h> // for Ginny
	#define r return // 2008-2019
	#define l(a, b, c, d) for (i y=a;y\
	<b; y++) for (int x = c; x < d; x++)
	typedef int i;const i H=40;const i W
	=80;i m[40][80];i g(i x){r rand()%x;
	}void cave(i s){i w=g(10)+5;i h=g(6)
	+3;i t=g(W-w-2)+1;i u=g(H-h-2)+1;l(u

	VERSION = \"1.0.0\"

	PREFIX ?= out
	INCDIR = include
	SRCDIR = src
	LANG = c
	OBJDIR = .obj

	MODULE ?= binary_name
	CC ?= gcc

	#include <string>
	#include <dlfcn.h>
	#include <stdio.h>
	#include <sys/mman.h>
	#include <unistd.h>
	#include <errno.h>
	#include <stdlib.h>

	using namespace std::literals;

	require 'set'

	def read_most_common_words
	File.read('100_000-english.txt').split("\n")
	end

	def read_etymologies
	File.read('etymwn-20130208/etymologies.tsv').split("\n").map do \|line\|
	parts = line.downcase.split("\t")
	[parts[0], parts[2]]

	# The code for my article with the same name. You can find it at the URL below:
	# https://www.mvanga.com/blog/basic-music-theory-in-200-lines-of-python

	# MIT License
	#
	# Copyright (c) 2021 Manohar Vanga
	#
	# Permission is hereby granted, free of charge, to any person obtaining a copy
	# of this software and associated documentation files (the "Software"), to deal
	# in the Software without restriction, including without limitation the rights

	#!/bin/bash

	# The default BAR address space available on the CM4 may be too small to allow
	# some devices to initialize correctly. To avoid 'failed to assign memory'
	# errors on boot, you can increase the range of the PCIe bus in the Raspberry
	# Pi's Device Tree (a .dtb file specific to each Pi model).
	#
	# You should probably read up on Device Trees if you don't know what they are:
	# https://www.raspberrypi.org/documentation/configuration/device-tree.md
	#