michiel

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

michiel

I use PlantUML a lot. It's what I use for drawing all sorts of diagrams and it's handy because of its easy markup (once you get used to it) while making things easy to maintain as projects grow (thanks to version control)

This gist details how I do my PlantUML workspace in a project.

• The idea is to keep a globals directory for all diagrams to follow (like the "stylesheet" below) to keep things consistent.
• The stylesheet.iuml file keeps the use of colors consistent through use of basic FOREGROUND, BACKGROUND and ACCENT colors.
• The style-presets.iuml file defines these colors so you can make "presets" or "themes" out of them.
• As stated in the stylesheet.iuml, you'll need the Roboto Condensed and Inconsolata fonts for these to work properly.

michiel

-- Enable pl/v8:
CREATE EXTENSION plv8;

-- Create json history table:
CREATE TABLE json_history (id BIGSERIAL PRIMARY KEY, tstamp timestamp DEFAULT now(), table_name text, column_name text, target_id bigint, transform json);

-- Create test table:
CREATE TABLE test_json (id BIGSERIAL PRIMARY KEY, data JSON);

-- Enable history tracking on test_json.data:

michiel

-- Reasonably efficient pagination without OFFSET
-- SQLite version (Adapted from MS SQL syntax)
-- Source: http://www.phpbuilder.com/board/showpost.php?p=10376515&postcount=6

SELECT foo, bar, baz, quux FROM table
 WHERE oid NOT IN ( SELECT oid FROM table
                    ORDER BY title ASC LIMIT 50 )
 ORDER BY title ASC LIMIT 10

michiel

license: gpl-3.0

michiel

#!/bin/bash
set -e
[[ "$(git symbolic-ref --short HEAD)" == "master" ]] || exit 0

msg() {
    echo "> $@"
}

dir="$(pwd)"
tmp="$(mktemp -d)"

michiel

import DS from 'ember-data';

export default DS.JSONAPISerializer.extend({

  // This returns the key as-is to the model, instead of converting between a dasherized JSONAPI and a camelCased JS model.
  keyForAttribute(key) {
    return key;
  },
  keyForRelationship(key) {
    return key;

michiel

/*
 * I add this to html files generated with pandoc.
 */

html {
  font-size: 100%;
  overflow-y: scroll;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

michiel

/**
 * MIT License
 *
 * Copyright (c) 2016 Richard Adams (https://github.com/enriched)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is

michiel

$ tmux attach
protocol version mismatch (client 7, server 6)

$ pgrep tmux
3429
$ /proc/3429/exe attach