Thorsten Lorenz thlorenz

Understanding why the new V8 is so Damn Fast, One Demo at a Time

Abstract

The entire V8 compiler architecture as well as large parts of the Garbage Collector where updated recently. TurboFan replaced Crankshaft, Orinoco now collects garbage in parallel whenever possible. Node.js v8 shipped with this new and improved version of V8. As a result we can finally write idiomatic and declarative JavaScript without worrying about incurring performance overhead due to JavaScript compiler shortcomings.

At least this is what the V8 team tells us. In this talk we will explore if and why this is true, one demo at a time.

Summary

Tried to improve debugging when an express middleware is wrapped to auto-handle errors of an asnync function.

Turns out the below reads a bit better than a return Promise.catch() implementation, but still, once we reach the central express error handler, the line of the wrapped function that caused the error isn't included.

Implementation

'use strict'

Collaborator Guidelines

Now where you are a collaborator you have certain powers that you should use carefully, so I'm listing some guidelines here.

Contributing

Proposing a Change

Even though as a contributor you could push directly to master, please don't do that. Instead each bug fix or feature

Go to My List
Open DevTools
Paste the below code into the console
Hit Enter
Your list is in your clipboard sorted by title

var cards = document.getElementsByClassName("smallTitleCard"), s = [], title;
for (var i = 0; i < cards.length; i++) {
 title = cards.item(i).attributes.getNamedItem('aria-label').textContent;

gdbinit

set disassemble-next-line on
set dissasembly-flavor intel

b _start
run

while 1

Steps to checkout v8 source and initialize it properly. This includes tests, d8 and example projects.

## get source and initialize dependencies
git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git && cd depot_tools
export PATH=`pwd`:$PATH

cd ../
mkdir v8_checkout &amp;&amp; cd v8_checkout

Table of Contents generated with DocToc

Timers
uv_timer_again

Scriptie Talkie Log

In case this doesn't work in your browser.

Outlines how binary flags work.

Script

var alive = parseInt('0001', 2);

	#!/usr/bin/env node

	const fs = require('fs')
	const path = require('path')

	function bySizeThenByName(a, b) {
	if (a.size === b.size) {
	return a.path.localeCompare(b)
	}
	return a.size < b.size

	#!/bin/bash

	replacements=(
	"NanAsyncWorker/Nan::AsyncWorker"
	"NanAsyncQueueWorker/Nan::AsyncQueueWorker"
	"NanCallback/Nan::Callback"
	"NanSetInternalFieldPointer/Nan::SetInternalFieldPointer"
	"NanGetInternalFieldPointer/Nan::GetInternalFieldPointer"
	"NanNewBufferHandle\\(([^;]+);/Nan::NewBuffer(\\1.ToLocalChecked();"
	"(NanNew(<(v8::)?String>)?\\(\"[^\"]*\"\\))/\\1.ToLocalChecked()"