markd2

#!/usr/sbin/dtrace -s

/* Run like:
% sudo csh
# ./spy.d $PROCESS_ID [$INTERESTING_PROBEPROV]

Prints a line of dashes every 5 seconds to delineate different experiments.
*/

#pragma D option quiet

jordanorelli

import gifAnimation.*;

GifMaker gifExport;
int frames = 0;
int totalFrames = 120;

public void setup() {
  smooth();
  size(400, 400);

joevandyk

begin;

/*
Problem: I don't want the application to really care about how the data is
structured in the database. The application / view code needs to work
with the data in a sane format, without worrying about normalization, joins,
eager fetching, etc.

DB Schema Overview:
  orders

quiver

Pub/Sub pattern with PostgreSQL's LISTEN/NOTIFY command

This is a simple chat-like program using pub-sub pattern, backed by PostgreSQL's LISTEN/NOTIFY command.

Publish

publish message to foo channel from user nickname.

$ python pub.py foo nickname
PUBLISH to channel #foo

jnicklas

Capybara.add_selector :record do
  xpath { |record| XPath.css("#" + ActionController::RecordIdentifier.dom_id(record)) }
  match { |record| record.is_a?(ActiveRecord::Base) }
end

tonymorris

// Missing support libraries
object MissingLibraries {
  case class State[S, +A](run: S => (A, S))  {
    def map[B](f: A => B): State[S, B] =
      State(s => {
        val (a, t) = run(s)
        (f(a), t)
      })

    def flatMap[B](f: A => State[S, B]): State[S, B] =

mikhailov

# Nginx+Unicorn best-practices congifuration guide. Heartbleed fixed.
# We use latest stable nginx with fresh **openssl**, **zlib** and **pcre** dependencies.
# Some extra handy modules to use: --with-http_stub_status_module --with-http_gzip_static_module
#
# Deployment structure
#
# SERVER:
#  /etc/init.d/nginx                             (1. nginx)
#  /home/app/public_html/app_production/current  (Capistrano directory)
#

marktheunissen

This playbook has been removed as it is now very outdated.

ckirkendall

(use '[clojure.core.match :only [match]])

(defn evaluate [env [sym x y]]
  (match [sym]
    ['Number]   x
    ['Add]      (+ (evaluate env x) (evaluate env y))
    ['Multiply] (* (evaluate env x) (evaluate env y))
    ['Variable] (env x)))
    
(def environment {"a" 3, "b" 4, "c" 5})

jboner

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