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-- https://www.geekytidbits.com/performance-tuning-postgres/
-- http://www.craigkerstiens.com/2012/10/01/understanding-postgres-performance/
-- http://okigiveup.net/what-postgresql-tells-you-about-its-performance/
-- https://wiki.postgresql.org/wiki/Introduction_to_VACUUM,_ANALYZE,_EXPLAIN,_and_COUNT
-- https://devcenter.heroku.com/articles/postgresql-indexes#b-trees-and-sorting
-- http://www.databasesoup.com/2014/05/new-finding-unused-indexes-query.html
-- performance tools
-- https://www.vividcortex.com/resources/network-analyzer-for-postgresql

-- show running queries (pre 9.2)

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production:
  after_rails:
    - source: /.cloud66/log_files.yml
      destination: /etc/log_files.yml
      sudo: true
      target: rails
      apply_during: build_only

    - source: /.cloud66/remote_syslog.init.d
      destination: /etc/init.d/remote_syslog

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production:
  after_symlink:
    - source: /.cloud66/log_files.yml
      destination: /etc/log_files.yml
      sudo: true
      target: any
      apply_during: all

    - source: /.cloud66/remote_syslog.init.d
      destination: /etc/init.d/remote_syslog

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Technical Papers

2019

1. Oct 15: Google's Bigtable paper
2. Dec 5: "Producing Wrong Data Without Doing Anything Obviously Wrong!" +

2020

1. Jan 20: "Source Code Rejuvenation is not Refactoring" +

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What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

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# First the end result of what we want:

class Foo
  before_hook :whoa
  before_hook :amazing

  def test
    puts "This is kinda cool!"
  end

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{
  // http://eslint.org/docs/rules/

  "ecmaFeatures": {
    "binaryLiterals": false,                    // enable binary literals
    "blockBindings": false,                     // enable let and const (aka block bindings)
    "defaultParams": false,                     // enable default function parameters
    "forOf": false,                             // enable for-of loops
    "generators": false,                        // enable generators
    "objectLiteralComputedProperties": false,   // enable computed object literal property names

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#!/usr/bin/ruby1.9.1 -Kw
# -*- coding: utf-8 -*-

class Edge
  attr_accessor :src, :dst, :length
  
  def initialize(src, dst, length = 1)
    @src = src
    @dst = dst
    @length = length

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

So you're curious in learning this new thing called Reactive Programming, particularly its variant comprising of Rx, Bacon.js, RAC, and others.

Learning it is hard, even harder by the lack of good material. When I started, I tried looking for tutorials. I found only a handful of practical guides, but they just scratched the surface and never tackled the challenge of building the whole architecture around it. Library documentations often don't help when you're trying to understand some function. I mean, honestly, look at this:

Rx.Observable.prototype.flatMapLatest(selector, [thisArg])

Projects each element of an observable sequence into a new sequence of observable sequences by incorporating the element's index and then transforms an observable sequence of observable sequences into an observable sequence producing values only from the most recent observable sequence.

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Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one