Dylan Wang Ehekatl

If you're using a high-end bluetooth headset on your Macbook Pro it's likely your mac is using an audio codec which favors battery efficiency over high quality. This results in a drastic degradation of sound, the SBC codec is the likely culprit, read more about it here.

Find out what codec you're using

Play a song on your headphones
Option (⌥) click the Bluetooth button at the top of your screen
If you're using AAC or aptX, you can stop here—those are the highest quality codecs.

Change your codec to AAC or aptX

Using Git Commit Message Templates to Write Better Commit Messages

The always enthusiastic and knowledgeable mr. @jasaltvik shared with our team an article on writing (good) Git commit messages: How to Write a Git Commit Message. This excellent article explains why good Git commit messages are important, and explains what constitutes a good commit message. I wholeheartedly agree with what @cbeams writes in his article. (Have you read it yet? If not, go read it now. I'll wait.) It's sensible stuff. So I decided to start following the

Forward GnuPG agent from macOS to Linux

On the remote machine

Run gpg once as your to create the directory structure

gpg --list-keys

For headless systemd based hosts

FFmpeg cheat sheet

A list of useful commands for the FFmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

I recently happened upon a very interesting implementation of popen() (different API, same idea) called popen-noshell using clone(2), and so I opened an issue requesting use of vfork(2) or posix_spawn() for portability. It turns out that on Linux there's an important advantage to using clone(2). I think I should capture the things I wrote there in a better place. A gist, a blog, whatever.

This is not a paper. I assume reader familiarity with fork() in particular and Unix in general, though, of course, I link to relevant wiki pages, so if the unfamiliar reader is willing to go down the rabbit hole, they should be able to come ou

Overview

Some notes about:

Explaining why current day Linux memory swap thrashing still happens (as of 2016).
Mitigating "stop the world" type thrashing issues on a Linux workstation when it's under high memory pressure and where responsiveness is more important than process completion.
Prioritizing and limiting memory use.
Older ulimit versus newer CGroup options.

These notes assume some basic background knowledge about memory management, ulimits and cgroups.

	# Copyright (c) 2017 Ansible Project
	# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

	from __future__ import absolute_import, division, print_function

	import os
	from collections import MutableMapping

	from yaml.nodes import MappingNode

	Add the following in .zshrc:

	...
	plugins=(osx git zsh-autosuggestions zsh-syntax-highlighting zsh-nvm docker kubectl)
	...

	### Fix slowness of pastes with zsh-syntax-highlighting.zsh
	pasteinit() {
	OLD_SELF_INSERT=${${(s.:.)widgets[self-insert]}[2,3]}
	zle -N self-insert url-quote-magic # I wonder if you'd need `.url-quote-magic`?

	#!/bin/bash
	# Inspired by https://github.com/oogali/ebs-automatic-nvme-mapping
	# Thanks Oogali!
	# Tested on Ubuntu 16.04
	# To be used with the below udev rule (/etc/udev/rules.d/99-ebs-nvme.rules)
	# SUBSYSTEM=="block", KERNEL=="nvme[0-9]n[0-9]", ATTRS{model}=="Amazon Elastic Block Store", PROGRAM+="/usr/local/sbin/nvme-mapping.sh /dev/%k" SYMLINK+="%c"

	if [[ -x /usr/sbin/nvme ]] && [[ -b ${1} ]]; then
	# capture 32 bytes at an offset of 3072 bytes from the raw-binary data
	# not all block devices are extracted with /dev/ prefix

	#!/bin/bash -e

	TMPDIR="$(mktemp -d)"

	function cleanup() {
	rm -rf "$TMPDIR"
	}

	trap cleanup EXIT