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@dhh
dhh / test_induced_design_damage.rb
Last active Dec 19, 2020
This is an extraction from Jim Weirich's "Decoupling from Rails" talk, which explained how to apply the hexagonal design pattern to make every layer of your application easily unit testable (without touching the database etc). It only seeks to extract a single method, the EmployeesController#create method, to illustrate the design damage that's …
View test_induced_design_damage.rb
# Original Rails controller and action
class EmployeesController < ApplicationController
def create
@employee = Employee.new(employee_params)
if @employee.save
redirect_to @employee, notice: "Employee #{@employee.name} created"
else
render :new
end
View latency.markdown

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns                     on recent CPU
L2 cache reference ........................... 7 ns                     14x L1 cache
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns                     20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs
Read 1 MB sequentially from memory ..... 250,000 ns  = 250 µs           4X memory
@mkandalf
mkandalf / .vimrc
Created Oct 19, 2012
Nick's .vimrc
View .vimrc
" ========
" Filetype
" ========
filetype off
filetype plugin indent on
" ========
" General Setup
" =======
set nocompatible
@kennethreitz42
kennethreitz42 / mongo.py
Created Mar 13, 2012 — forked from lstoll/mongo.py
MongoHQ w/ pymongo on Heroku
View mongo.py
import os
import pymongo
MONGO_URL = os.environ.get('MONGOHQ_URL')
if MONGO_URL:
# Get a connection
conn = pymongo.Connection(MONGO_URL)
# Get the database
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