Emerson Macedo emerleite

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hipsters.tech
nerdcast
freakonomics radio
software engineering daily
under the radar (marco arment & david smith)
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recode decode (?)

Using OTP's observer (appmon replacement) remotely

$ ssh remote-host "epmd -names"
epmd: up and running on port 4369 with data:
name some_node at port 58769

Note the running on port for epmd itself and the port of the node you're interested in debugging. Reconnect to the remote host with these ports forwarded:

$ ssh -L 4369:localhost:4369 -L 58769:localhost:58769 remote-host

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

Elixir installation guide

Version numbers should be the ones you want. Here I do it with the last ones available at the moment of writing.

The simplest way to install elixir is using your package manager. Sadly, at the time of writing only Fedora shows the intention to keep its packages up to date. There you can simply sudo dnf install erlang elixir and you are good to go.

Anyway, if you intend to work with several versions of erlang or elixir at the same time, or you are tied to a specific version, you will need to compile it yourself. Then kerl and exenv are your best friends.

These are the Kickstarter Engineering and Data role definitions for both teams.

Technical	Data	People
Junior Software Engineer
Software Engineer	Data Analyst
Senior Software Engineer	Data Scientist	Engineering Manager
Staff Engineer	VP of Data	Engineering Director
Principal Engineer		CTO

Copy, with line wrapping!

If you've been trying to copy/paste text from a multi-pane tmux session with the mouse, you've probably been pretty pissed at the blissful ignorance a terminal application has of the rodent in your hand.

The alternative, which is quote-unqoute native copy/pasting using copy-mode takes a bit to get used to. So this is one solution for copying and pasting lines from a session with correct line wrapping behaviour, albeit keyboard only.

Disclaimer

Since copy-mode has similar concepts of marks, regions, and temp buffers to Emacs .. you'll probably find it straight forward if you're familar with Emacsen. For people using vi-mode in tmux, the same still applies but obviously the default key bindings will differ alot from what I show below.

	# This image is designed as a base image to use in creating exrm releases. It
	# includes quite a few things that you would not need for just a pure runtime
	# but is also suitable to use as a base for a phoenix app (you may need to add
	# npm for handling the static assets)

	FROM debian:jessie

	MAINTAINER Someone <[email protected]>

	ENV DEBIAN_FRONTEND noninteractive

	Os segredos da mente milionária (João Augusto Rodrigues)

	Ou você controla o seu dinheiro ou ele controlará você. - O hábito de administrar as finanças é mais importante do que a quantidade de dinheiro que você tem. - A sua motivação para enriquecer é crucial: se ela possui uma raiz negativa, como o medo, a raiva ou a necessidade de provar algo a si mesmo, o dinheiro nunca lhe trará felicidade. - O segredo do sucesso não é tentar evitar os problemas nem se livrar deles, mas crescer pessoalmente para se tornar maior do que qualquer adversidade. - Os gastos excessivos têm pouco a ver com o que você está comprando e tudo a ver com a falta de satisfação na sua vida.

	A resposta, segundo o autor, está no modelo pessoal de dinheiro que todos nós trazemos gravado no subconsciente.

	Acima de tudo, sentia medo. Temia fracassar, ou pior, ter sucesso e acabar perdendo tudo. Nesse caso, eu seria realmente um panaca. Pior, destruiria a única coisa que soprava a meu favor: a lenda de que eu tinha um grande potencial. E se

	# hubot

	description "Hubot Slack bot"
	author "Adam Whittingham <emailaddress>"

	start on filesystem or runlevel [2345]
	stop on runlevel [!2345]

	# Path to Hubot installation
	env HUBOT_DIR='/opt/hubot/kaytoo/'