javouhey

Effective Engineer - Notes

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

What's an Effective Engineer?

They are the people who get things done. Effective Engineers produce results.

Adopt the Right Mindsets

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
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

Lessons

http://stackoverflow.com/questions/7148419/subclass-dict-userdict-dict-or-abc
- To create your custom dicts, avoid UserDict, subclass collections.abc.MutableMapping. #py3x
https://docs.python.org/dev/library/collections.abc.html #py3x
http://stackoverflow.com/questions/23305359/why-do-python-have-so-many-ways-to-test-for-a-dictionary-type

reference

http://www.itmaybeahack.com/book/python-2.6/html/p03/p03c04_extending.html

	These are a subset of the talks that I attended & ones that I enjoyed.
	In no particular order:

	1. Shipping in Pirate-Infested Waters: Practical Attack and Defense in Kubernetes
	Greg Castle & CJ Cullen, Google
	https://kccncna17.sched.com/event/CU86/shipping-in-pirate-infested-waters-practical-attack-and-defense-in-kubernetes-a-greg-castle-cj-cullen-google

	- The presenters wore hats that matched with the pirate theme.
	- tldr; basic ways to harden your kubernetes cluster.
	- extra: Google security team (in the Seattle office) is hiring.

	#!/boot/bzImage

	# Linux kernel initialization code, translated to bash
	# (Minus floppy disk handling, because seriously, it's 2017.)
	# Not 100% accurate, but gives you a good idea of how kernel init works
	# GPLv2, Copyright 2017 Hector Martin <[email protected]>
	# Based on Linux 4.10-rc2.

	# Note: pretend chroot is a builtin and affects the current process
	# Note: kernel actually uses major/minor device numbers instead of device name

	#!/usr/bin/env python

	import sys, os, time, atexit
	from signal import SIGTERM

	class Daemon:
	"""
	A generic daemon class.

	Usage: subclass the Daemon class and override the run() method

	> /home/gavin/dev/gavin/hawkeye/useful/pyhawk/mycode/sample_client.py(53)<module>()->None
	-> main()
	(Pdb) c
	Traceback (most recent call last):
	File "sample_client.py", line 53, in <module>
	main()
	File "sample_client.py", line 33, in main
	res = requests.get(url, data=params, headers=headers)
	File "/home/gavin/dev/gavin/hawkeye/useful/pyhawk/local/lib/python2.7/site-packages/requests/api.py", line 55, in get
	return request('get', url, **kwargs)

	function goinit {
	export GOROOT=/usr/local/Cellar/go/1.2.1/libexec
	if [ $# -lt 1 ]
	then
	echo "No directories were created."
	export GOPATH=$(pwd -P)
	export PATH=$PATH:$GOPATH:$GOPATH/bin
	else
	echo "$1 being created"
	mkdir $1