Rainier Ababao rainiera

Quick Tips for Fast Code on the JVM

I was talking to a coworker recently about general techniques that almost always form the core of any effort to write very fast, down-to-the-metal hot path code on the JVM, and they pointed out that there really isn't a particularly good place to go for this information. It occurred to me that, really, I had more or less picked up all of it by word of mouth and experience, and there just aren't any good reference sources on the topic. So… here's my word of mouth.

This is by no means a comprehensive gist. It's also important to understand that the techniques that I outline in here are not 100% absolute either. Performance on the JVM is an incredibly complicated subject, and while there are rules that almost always hold true, the "almost" remains very salient. Also, for many or even most applications, there will be other techniques that I'm not mentioning which will have a greater impact. JMH, Java Flight Recorder, and a good profiler are your very best friend! Mea

What I Wish I'd Known About Equity Before Joining A Unicorn

Disclaimer: This piece is written anonymously. The names of a few particular companies are mentioned, but as common examples only.

This is a short write-up on things that I wish I'd known and considered before joining a private company (aka startup, aka unicorn in some cases). I'm not trying to make the case that you should never join a private company, but the power imbalance between founder and employee is extreme, and that potential candidates would

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

Effective Engineer - Notes

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

What's an Effective Engineer?

Setup

Using Homebrew on Mac OS X:

brew install jq

Add these aliases to your profile (e.g., ~/.zshrc, ~/.bashrc, ~/.profile, etc.):

alias hurlp='pbpaste | jq ".log.entries" | tee >(jq --raw-output "[.[] | .request.url] | sort | unique | .[]")'

System Design Cheatsheet

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

Basic Steps

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?

	// Tracking cursor position in real-time without JavaScript
	// Demo: https://twitter.com/davywtf/status/1124146339259002881

	package main

	import (
	"fmt"
	"net/http"
	"strings"
	)

	# to be used in conjunction with the functions defined here:
	# https://colab.research.google.com/github/tensorflow/hub/blob/master/examples/colab/biggan_generation_with_tf_hub.ipynb

	# party parrot transformation
	noise_seed_A = 3 # right facing
	noise_seed_B = 31 # left facing

	num_interps = 14
	truncation = 0.2
	category = 14

	import { curry, apply } from 'ramda';

	/**
	* Debounce
	*
	* @param {Boolean} immediate If true run `fn` at the start of the timeout
	* @param timeMs {Number} Debounce timeout
	* @param fn {Function} Function to debounce
	*
	* @return {Number} timeout

	# Search for `analytics` only inside `./src/app`
	git grep analytics -- "./src/app/*"