Edward Beech initialed85

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:

Running Ubuntu 16.04.1 armhf on Qemu

This is a writeup about how to install Ubuntu 16.04.1 Xenial Xerus for the 32-bit hard-float ARMv7 (armhf) architecture on a Qemu VM via Ubuntu netboot.

The setup will create a Ubuntu VM with LPAE extensions (generic-lpae) enabled. However, this writeup should also work for non-LPAE (generic) kernels.

The performance of the resulting VM is quite good, and it allows VMs with >1G ram (compared to 256M on versatilepb and 1G on versatile-a9/versatile-a15). It also supports virtio disks whereas versatile-a9/versatile-a15 only support SD cards via the -sd argument.

Get netboot files

The fastest remote directory rsync over ssh archival I can muster (40MB/s over 1gb NICs)

This creates an archive that does the following:

rsync (Everyone seems to like -z, but it is much slower for me)

a: archive mode - rescursive, preserves owner, preserves permissions, preserves modification times, preserves group, copies symlinks as symlinks, preserves device files.
H: preserves hard-links
A: preserves ACLs

	use std::str;

	fn main() {
	// -- FROM: vec of chars --
	let src1: Vec<char> = vec!['j','{','"','i','m','m','y','"','}'];
	// to String
	let string1: String = src1.iter().collect::<String>();
	// to str
	let str1: &str = &src1.iter().collect::<String>();
	// to vec of byte

	wget https://storage.googleapis.com/golang/go1.10.1.linux-armv6l.tar.gz
	sudo tar -C /usr/local -xvf go1.10.1.linux-armv6l.tar.gz
	cat >> ~/.bashrc << 'EOF'
	export GOPATH=$HOME/go
	export PATH=/usr/local/go/bin:$PATH:$GOPATH/bin
	EOF
	source ~/.bashrc


	# enable Docker for your repository
	options:
	docker: true

	pipelines:
	branches:
	development:
	- step:
	# python image with aws-cli installed

	$ python xor.py
	Training:
	Epoch 0 MSE: 1.765
	Epoch 100 MSE: 0.015
	Epoch 200 MSE: 0.005
	* Target MSE reached *
	Evaluating:
	1 XOR 0 = 1 ( 0.904) Error: 0.096
	0 XOR 1 = 1 ( 0.908) Error: 0.092
	1 XOR 1 = 0 (-0.008) Error: 0.008