Torgeir Thoresen torgeir

Algebraic Effects in JavaScript part 4 - Implementing Algebraic Effects and Handlers

This is the final part of a series about Algebraic Effects and Handlers.

Part 1 : continuations and control transfer
Part 2 : Capturing continuations with Generators
Part 3 : Delimited continuations
Part 4 : Implementing Algebraic Effects and handlers

So we've come to the core topic. The reality is that we've already covered most of it in the previous parts. Especially, in the third part, where we saw delimited continuations at work.

Arch Linux GPU-Passthrough

A quick guide on how to setup a GPU-Passthorugh. Below are some of my Resources

The Arch Wiki is the goto place for additional information and performance tweaks like CPU-Pinning.

Requirements

IGPU or second dedicated GPU for Host system (unless you want to go the hard way and use one GPU for HOST and GUEST)

Using Raspberry Pi Camera with ffmpeg

Capturing video from the rpi camera with ffmpeg can vary from less than 5% to 100% of the CPU (rpi zero) depending on ffmpeg using the hardware acceleration or not.

On many github issues one finds the suggestion of using h264_omx codec to use the gpu - but it does not ship with the default ffmpeg on Raspbian.

Instead I found that one can use the v4l2 driver provided by raspbian to get hardware accelerated h264 output. Also setting the video size will save one from using a (cpu) scale filter.

ffmpeg

capture h264 video from rpi camera

Methods of Signing Git Commits on MacOS

Last updated March 13, 2024

This Gist explains how to sign commits using gpg in a step-by-step fashion. Previously, krypt.co was heavily mentioned, but I've only recently learned they were acquired by Akamai and no longer update their previous free products. Those mentions have been removed.

Additionally, 1Password now supports signing Git commits with SSH keys and makes it pretty easy-plus you can easily configure Git Tower to use it for both signing and ssh.

For using a GUI-based GIT tool such as Tower or Github Desktop, follow the steps here for signing your commits with GPG.

Introduction

Sometimes you may want to use a DNS server for specific domain requests and another DNS server for all other requests. This is helpful, for instance, when connected to a VPN. For hosts behind that VPN you want to use the VPN's DNS server but all other hosts you want to use Google's public DNS. This is called "DNS splitting."

Here, we run dnsmasq as a background service on macOS. The dnsmasq configuration described below implements DNS splitting.

Install

brew install dnsmasq


	function isGenerator(x) {
	return x != null && typeof x.next === "function"
	}

	function isFrame(x) {
	return x != null && x._type_ === 'call_frame'
	}

	function call(genFunc, ...args) {

	#!/usr/bin/env python3
	#i3 per-workspace background for Caagr98 https://gist.github.com/Caagr98/f74e149403e5c1f92006158f09108a78
	#deps: pip3 install python3-xlib i3ipc Pillow
	# usage: i3bg2.py /path/to/directory
	# where directory holds wallpapers to randomly pick from (optional)
	import Xlib.threaded
	import Xlib
	import Xlib.display
	from Xlib import Xatom
	from PIL import Image

	let cache = new Map();
	let pending = new Map();

	function fetchTextSync(url) {
	if (cache.has(url)) {
	return cache.get(url);
	}
	if (pending.has(url)) {
	throw pending.get(url);
	}

	import java.lang.ProcessBuilder.Redirect
	import java.util.concurrent.TimeUnit

	fun String.runCommand(workingDir: File? = null) {
	val process = ProcessBuilder(*split(" ").toTypedArray())
	.directory(workingDir)
	.redirectOutput(Redirect.INHERIT)
	.redirectError(Redirect.INHERIT)
	.start()
	if (!process.waitFor(10, TimeUnit.SECONDS)) {

	FROM alpine/git:1.0.4

	CMD ["git", "version"]