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

import svgwrite
import math
import json

class Pyramid:
    def __init__(self, data, filename, height=500):
        self.data = data
        self.filename = filename
        self.height = height
        self.width = 2 * height

michiel

[
  "all the time",
  "as much as",
  "believe",
  "best practice",
  "can",
  "can be",
  "claim",
  "could",
  "cutting-edge",

michiel

@startuml

skinparam linetype poly

rectangle "Quality Dimension" {
    agent Reliability
    agent Security
    agent Efficiency
    agent Maintainability
    agent Size

michiel

#!/bin/sh

AWS_PROFILE=my-profile
AWS_REGION=ap-southeast-2

aws --profile=$AWS_PROFILE \
    --region=$AWS_REGION  \
    cloudfront list-distributions \
    | jq '.DistributionList.Items[].Origins.Items[] | {Id: .Id, OriginPath: .OriginPath}'

michiel

#!/bin/bash
# Using ffmpeg 2.8

SIZE=1920x1080
SPEED=.5
CAMERA_MODE=track
FRAMERATE=30

gource \
    -r $FRAMERATE \

michiel

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

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

michiel

// based on http://onais-m.blogspot.nl/2014/10/automatic-graph-layout-with-javascript.html
var jsp = jsPlumb.getInstance();

// construct dagre graph from JsPlumb graph
/* global dagre */
var g = new dagre.graphlib.Graph();
g.setGraph({});
g.setDefaultEdgeLabel(function() { return {}; });

$('.xnode').each(

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: