corroded/reddot_ruby_conf_day_one_notes.md

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    #Red Dot Ruby Conf 2012
##Day 1 Summary of Reddot Ruby Conf 2012
###Google: Ilya Grigorik - Building a Faster Web
####Learned a lot of metrics from Google's Ilya Grigorik:


Average page size back in Nov 2010: 700KB


Average page size today:            1042KB (does that mean pretty much most of the web sites today are unusable for people with slow connections?)


84 requests on average per page!


try not to use cookies as much as possible


page load battle!

Straits Times vs Guardian
Battlefield: Tokyo, using IE8
Straits:

@11-@25 seconds: nothing happens
@25 seconds: ads appear
@25.1 seconds: images appear
@25.9 seconds: ads replace image!


Blue Line in chrome's web inspector: DOMContentLoaded fires (when parsing is complete)


Red Line in chrome's web inspector: Page load (onload)


CSS on top(in ), JS at bottom(before end of )


async vs defer

regular: wait for network, execurte, proceed
defer: download in bg, execute in order after onload
async: download in bg, execute when ready


60% of weight of page are images (on average)

average 53 images on a page


===========
Heroku: Richard Schneeman - The 12 Factor App

http://12factor.net


Config:


use .env file + foreman


Procfile (for awetest?)
web: bundle exec unicorn -p
     $PORT -c ./config/unicorn.rb

worker: bundle exec rake jobs:work


Development vs Production

dev as close to prod as possible
use real/consistent data
heroku db:pull
rake tasks per feature, and one master rake feature to create production type data for app

for moving to a different machine and setting up the db


always specify versions for bundler


Not in 12 Factor but recommended: README.md

brew install memcache (instructions for external dependencies)


Staging Environment

should also have prod data


1 app 1 codebase

Branches (keep codebase clean)
Git Flow!


Logging

heroku logs -- remote production
-- tail
error pages, if user is admin, ACTUALLY SHOW ERROR BACKTRACE (for awetest)


Scale Out

Workers

Rails 4: Active queue
Resque, delayedjob, sidekiq


===========
Engine Yard: Thorben Schroder - PUBSUB Infrastructure


implicit distriution of information

share everything


===========
Github: Danish Khan - The ruby community


http://rubydramas.com
solutions:

respect each other
always have readme files

good documentation
have some examples
use github pages/jekyll


github issue labels for novice, intermediate, advanced
send pull requests


===========
HP Labs: Sau Sheong Chang - Ruby, Rock & Roll


http://github.com/sausheong/muse
compose music algorithmically from muse

grab a tweet from twitter, etc
EPIC!


===========
New Context: Winston Teo - CSS Testing


modular approach to building css

reuse of css styles
put all css styles in one page

like bootstrap


cactus - gem to test css w/ js

assert css styles

Cactus.expect ("header", "width").toEqual("800px")
has rspec and capybara capabilities


===========
Codemancers: Hemant Kumar - Ruby 1.9


Language changes:

current dir is no longer in load path (require_relative)
instance_exec = instance_eval with args
arity checking on lambda
blocks can accept block args
new lambda, hash syntax


GC & Obj allocation changes
has native VM threads

===========
Unit IO: Tim Oxley - Client side Rendering


client templates
infra
dynamic pages can be expensive
Why need a template engine

smaller stack
try ember rails
campjs.com


===========