fcheung

require 'benchmark/ips'

Benchmark.ips do |x|
  x.config(time: 60, warmup: 5)
  x.config(stats: :bootstrap, confidence: 95)
  x.report('binstub') { `bin/rspec -v`}
  x.report('bundle exec') {`bundle exec rspec -v `}
  x.report('direct') {`rspec -v `}
end

fcheung

require 'benchmark/ips'

def reverse(session_data)
  digest, session_data = session_data.reverse.split('--', 2)
  digest.reverse! if digest
  session_data.reverse! if session_data
  [session_data, digest]
end

def index(session_data)

fcheung

require 'ffi'
require 'get_process_mem'
require 'benchmark/ips'

module MemoryInfo
  extend FFI::Library
  ffi_lib 'c'
  attach_function :mach_task_self, [], :__darwin_mach_port_t
  attach_function :task_info, 
                  [

fcheung

#Updating from mongo ruby drive 1.x to 2.x

We've recently been belatedly migrating to the 2.x series of the mongo ruby driver. At least in part this is because there's very little documentation out there on what has changed, except that there is no backwards compatibility. This post is a list of issues that we came across - I expect it is by no means exhaustive

Dependencies

Before you get started, make sure that any dependencies you have are also comaptible with mongo 2.x. For example database_cleaner needs to be 1.5 or higher

fcheung

source 'https://rubygems.org'
gem 'rails', '~> 4.2.7.1'
gem 'devise', '~> 3.5.0'
gem 'rspec-rails', '~> 3.4.0'

fcheung

Keybase proof

I hereby claim:

• I am fcheung on github.
• I am frederickcheung (https://keybase.io/frederickcheung) on keybase.
• I have a public key whose fingerprint is 9A1B 5755 1E45 1BAE 41D4 8905 C4CD 3D1E B871 B631

To claim this, I am signing this object:

fcheung

class Tree
    attr_accessor :payload, :children
    def initialize(payload, children = [])
        @payload = payload
        @children = children
    end 

    def traverse(&block)
      yield self
      @children.each {|child| child.traverse(&block)}

fcheung

Going Native

We all love ruby, but sometimes ruby is not enough. Whether it be a performance bottleneck, a killer library written in C or some platform specific functionality you just have to have, sometimes you need to drop down a level.

There have been many talks that show how to take the first steps in writing a ruby C extension. This isn't one of them. I propose instead to give an overview of different ways of extending ruby and show what each approach brings to the table. I intend to cover 'classic' C extensions, RubyInline and FFI across a range of ruby implementations.

About me

fcheung

class Image
  attr_accessor :data
  def initialize (data)
     @data = data  
  end

  def image_blur
    changes = []

    @data.each_with_index do |row, row_index|

fcheung

class Image
	attr_accessor :data
   	def initialize (data)
     	@data = data  
   	end

    def output
      @data.each do |sub|
        sub.each do |cell|
          print cell