James Hollingworth jhollingworth

#Why are profiles fast?

There's a lot of work that goes into determining what profiles you're in. People often ask if having a large number of profiles on the page will negatively affect performance. When designing profiles we're accutely aware of this problem and so have implemented a number of optimisations to ensure we're performant at scale.

To create a profile, you define a profile specification. Profile specifications are a lisp-esque langauge that allows you to define a predicate tree.

[
  "and",
 [

#Translating Marty to Redux

Some people have asked how I've translated a Marty app to Redux. Once you get your head around how Redux works I found concepts in Marty translated easily. Below is side-by-side comparison of the two libraries to help you along the way.

Also if you're looking for some devtools, check out redux-devtools.

##Constants

Marty

	<!DOCTYPE html>
	<html>
	<body>
	<div id="container"></div>
	<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/pixi.js/4.7.0/pixi.js"></script>
	<script type="text/javascript">
	var app = new PIXI.Application(800, 600, { transparent: true });

	document.getElementById('container').appendChild(app.view);

	<!DOCTYPE html>
	<html>
	<body>
	<div id="container"></div>
	<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/pixi.js/4.7.0/pixi.js"></script>
	<script type="text/javascript">
	var app = new PIXI.Application(800, 600, { transparent: true });

	document.getElementById('container').appendChild(app.view);

	PIXI.loader
	.add('required/assets/depth_blur_BG.jpg')
	.add('required/assets/depth_blur_moby.jpg')
	.load(main);

	function main() {
	var app = {
	screen: {
	width: 650,
	height: 650,

	[0106/110405.870165:ERROR:gpu_process_transport_factory.cc(1043)] Lost UI shared context.

	DevTools listening on ws://127.0.0.1:35003/devtools/browser/0fa5a5a6-a323-4fa5-93f9-890819314009
	Fontconfig warning: "/etc/fonts/fonts.conf", line 146: blank doesn't take any effect anymore. please remove it from your fonts.conf
	[0106/110406.813320:INFO:gl_bindings_autogen_egl.cc(1370)] eglChooseConfig(0x1, 0x7ffcbbdc37b0, (nil), 0, 0x7ffcbbdc3754)
	[0106/110406.813423:INFO:gl_bindings_autogen_egl.cc(1373)] GL_RESULT: 1
	[0106/110406.813466:INFO:gl_bindings_autogen_egl.cc(1370)] eglChooseConfig(0x1, 0x7ffcbbdc37b0, 0x7ffcbbdc3748, 1, 0x7ffcbbdc3754)
	[0106/110406.813499:INFO:gl_bindings_autogen_egl.cc(1373)] GL_RESULT: 1
	[0106/110406.813519:INFO:gl_bindings_autogen_egl.cc(1448)] eglCreatePbufferSurface(0x1, 0x2e, 0x317febff860)
	[0106/110406.813565:INFO:gl_bindings_autogen_egl.cc(1451)] GL_RESULT: 0x317fed1f700

	[0104/105517.182758:VERBOSE1:histogram.cc(400)] Histogram: Blink.Canvas.DrawImage.Canvas.CPU has bad minimum: 0
	[0104/105517.237338:VERBOSE1:gl_factory.cc(102)] Using egl GL implementation.
	[0104/105517.237476:INFO:gl_bindings_autogen_egl.cc(1370)] eglChooseConfig(0x1, 0x7ffdd2eee570, (nil), 0, 0x7ffdd2eee514)
	[0104/105517.237532:INFO:gl_bindings_autogen_egl.cc(1373)] GL_RESULT: 1
	[0104/105517.237556:INFO:gl_bindings_autogen_egl.cc(1370)] eglChooseConfig(0x1, 0x7ffdd2eee570, 0x7ffdd2eee508, 1, 0x7ffdd2eee514)
	[0104/105517.237583:INFO:gl_bindings_autogen_egl.cc(1373)] GL_RESULT: 1
	[0104/105517.237604:INFO:gl_bindings_autogen_egl.cc(1448)] eglCreatePbufferSurface(0x1, 0x2e, 0x3889b34dcaa0)
	[0104/105517.237646:INFO:gl_bindings_autogen_egl.cc(1451)] GL_RESULT: 0x3889b355d7a0
	[0104/105517.237693:INFO:gl_bindings_autogen_egl.cc(1634)] eglGetConfigAttrib(0x1, 0x2e, 12352, 0x7ffdd2eed0d8)
	[0104/105517.237720:INFO:gl_bindings_autogen_egl.cc(1637)] GL_RESULT: 1

	> sudo yum install libXext-devel libX11-devel xorg-x11-server-Xorg xorg-x11-server-Xvfb

	> ls /usr/lib64 \| grep X11
	libX11.so
	libX11.so.6
	libX11.so.6.3.0
	libX11-xcb.so
	libX11-xcb.so.1
	libX11-xcb.so.1.0.0
	X11

	<!DOCTYPE html>
	<html>
	<head>
	<script type="text/javascript">
	console.log('hello world')
	</script>
	</head>
	<body>
	</body>
	</html>

	<!DOCTYPE html>
	<html>
	<body>
	<canvas id="canvas" width="1080" height="1080"></canvas>
	<script type="text/javascript">
	var canvas = document.getElementById('canvas');
	var gl = canvas.getContext('webgl');

	gl.viewportWidth = canvas.width;
	gl.viewportHeight = canvas.height;