aalhour

Pry Cheat Sheet

• Youtube Tutorial 2013

Command Line

• pry -r ./config/app_init_file.rb - load your app into a pry session (look at the file loaded by config.ru)
• pry -r ./config/environment.rb - load your rails into a pry session

Debugger

aalhour

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
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 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

aalhour

Economics & Software Development - Book List

The following books are ordered in descending order of Matthew's preference.

The Art of Strategy

by Avinash K. Dixit

Recommended by Ted Neward. A different perspective and writing style from the other volumes listed.

“I am hard pressed to think of another book that can match the combination of practical insights and reading enjoyment.”—Steven Levitt

aalhour

This is a plain-text version of Bret Victor’s reading list. It was requested by hf on Hacker News.

---

Highly recommended things!

This is my five-star list. These are my favorite things in all the world.

A few of these works have had an extraordinary effect on my life or way of thinking. They get a sixth star. ★

aalhour

Distributed Systems Reading List

Links for Further Reading

• You Can't Sacrifice Partition Tolerance
• Twitter conversation with Jay Kreps about Vector Clocks
• Why Cassandra Doesn't Need Vector Clocks
• Why Vector Clocks are Easy
• Why Vector Clocks are Hard
• Cache is the New RAM
• Neat Algorithms: Paxos

aalhour

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

aalhour

# N.B. The only tool missing here that is mentioned in the document is `zenmap`
# purely because this image is intended to be run via a CLI and `zenmap` is a GUI
# to `nmap` i.e. one can play around with the tools by running:
#
# $ docker build --name bite_size_networking:latest .
# $ docker run --rm -d --name bsn_test bite_size_networking:latest
# $ docker exec -it bsn_test bash
#
# Alternatively, one can change the `ENTRYPOINT` to `["bash"]` and run:
#

aalhour

Cognitive Bias Codex

Further Reading

• 180+ cognitive biases, codified and categorized by Buster Benson: Cognitive bias cheat sheet
• printed poster version: now available from Design Hacks

aalhour

FWIW: I didn't produce the content present here. I've just copy-pasted it from somewhere over the Internet, but I cannot remember exactly the original source. I was also not able to find the author's name, so I cannot give him/her the proper credit.

---

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

aalhour

#!/usr/bin/env python3

__author__ = "Ahmad Alhour"
__date__ = "2017-10-29"
__website__ = "https://gist.github.com/aalhour/533b8ea1a1d71bbfb026c16d956aa6d2"

"""
eca.py

Elementary Cellular Automata PNG images generator. Based on Nicolas Seriot's gist (https://goo.gl/fh4d5Y).