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

timmc

;; It all started here: http://clojure-log.n01se.net/date/2011-04-06.html#19:04

(#((% (+(*))) %) ;; call arg 1 with all args
 [;; data
  (+ (*)(*)(*)(*)(*)(*)(*))
  ;; main fn -- simulate 'if' with map lookup and closures
  #(({(+) (% (+(*)(*)))} ;; if zero return 'then' clause
     (% (+)) ;; dispatch on first arg
     (% (+(*)(*)(*)))) ;; call 'else' clause (n not found in map)
    %)

cqfd

-module(ring).
-export([chain/0, chain/1, start/3]).

chain() ->
    chain(self()).

chain(Neighbor) ->
    receive
        stop ->
            io:format("stopping ~p...~n", [self()]),

noahlz

Organizing Clojure Projects

Presented by @stuartsierra

Stuart presented using a deck created with org-html-slideshow, a Clojure library for formatting org-mode notes as HTML slides.

General Code Structure / Organization

1. Be careful not to make function calls across component boundaries.
2. Protocols should be minimalistic. They should have the fundamental operations of your component.

zachallaun

Here's some erlang.

-module(mini_chat).
-compile(export_all).

-define(ACTIVE_OPTIONS, [{reuseaddr, true}]).

% Commands start with "/", char 47

zerokarmaleft

AA = Rickard Stark (M)        AB = Eddard Stark (M)         AC = Catelyn Tully (F)
AD = Brandon Stark (M)        AE = Benjen Stark (M)         AF = Jon Snow (M)
AG = Robb Stark (M)           AH = Sansa Stark (F)          AI = Arya Stark (F)
AJ = Bran Stark (M)           AK = Rickon Stark (M)         AL = Hoster Tully (M)
AM = Minisa Whent (F)         AN = Edmure Tully (M)         AO = Lysa Tully (F)
AP = Jon Arryn (M)            AQ = Robert Arryn (M)         AR = Tytos Lannister (M)
AS = Tywin Lannister (M)      AT = Joanna Lannister (F)     AU = Kevan Lannister (M)
AV = Cersei Lannister (F)     AW = Jamie Lannister (M)      AX = Tyrion Lannister (M)
AY = Robert Baratheon (M)     AZ = Joffrey Baratheon (M)    BA = Myrcella Baratheon (F)
BB = Tommen Baratheon (M)     BC = Lancel Lannister (M)     BD = Steffon Baratheon (M)

ngocdaothanh

package recfun

import scala.collection.mutable.ListBuffer
import common._

/** https://class.coursera.org/progfun-2012-001/assignment/view?assignment_id=4 */
object Main {
  def main(args: Array[String]) {
    println("Pascal's Triangle")
    for (row <- 0 to 10) {

phedders

h=1.2.3.4;

read a b port MOSH_KEY < <(ssh $h -t mosh-server 2>/dev/null|tr -d "\r"|grep MOSH); mosh-client $h $port

or

eval `ssh $h -t mosh-server 2>/dev/null|tr -d "\r"|awk '/^MOSH CONNECT/{print "MOSH_KEY=" $4,"mosh-client $h",$3}'`

gtrak

(ns xml.test
  (:require [clojure.java.io :as io]
            [clojure.data.xml :as xml]))

;; wget
;; download.geofabrik.de/openstreetmap/north-america/us/maryland.osm.bz2

(def xml-seq
  #(-> (io/file "/home/gary/dev/maryland.osm")
       io/input-stream

jordanorelli

import gifAnimation.*;

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

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