clojens

#!/bin/bash

size_in_mib=32
bytes=$((2 ** 20 * $size_in_mib))
sectors=$(($bytes / 512))
heads=16
cylinders=$(($sectors / $heads / 63))

dd if=/dev/zero of=baremetal.img bs=512 count=$sectors
dd if=fat16mbr.bin of=baremetal.img conv=notrunc

clojens

Backend Architectures

Twitter

ror, scala, jetty, erlang, thrift, mongrel, comet server, my-sql, memchached, varnish, kestrel(mq), starling, gizzard, cassandra, hadoop, vertica, munin, nagios, awstats

• Introduce Gizzard of Twitter - 트위터의 새로운 분산 관리 라이브러리 Gizzard를 소개합니다.
• The Architecture Twitter Uses to Deal with 150M Active Users, 300K QPS, a 22 MB/S Firehose, and Send Tweets in Under 5 Seconds
• Scaling Twitter: Making Twitter 10000 Percent Faster

clojens

(ns async-test.timeout.core
  (:require [cljs.core.async :refer [chan close!]])
  (:require-macros
    [cljs.core.async.macros :as m :refer [go]]))
 
(defn timeout [ms]
  (let [c (chan)]
    (js/setTimeout (fn [] (close! c)) ms)
    c))
 

clojens

// ==UserScript==
// @name        URL Observer Addon
// @namespace   anon
// @match       http://*/*
// @match       https://*/*
// @exclude     http://localhost/*
// @version     2
// @require     http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
// @grant       GM_info
// @grant       metadata

clojens

Copied from http://code.lancepollard.com/complete-list-of-html-meta-tags/

Basic HTML Meta Tags

<meta charset='UTF-8'>
<meta name='keywords' content='your, tags'>
<meta name='description' content='150 words'>
<meta name='subject' content='your website's subject'>
<meta name='copyright' content='company name'>

clojens

; http://www.algolist.com/Dijkstra's_algorithm

(defn dijkstra [g src]
  (loop [dsts (assoc (zipmap (keys g) (repeat nil)) src 0)
         curr src
         unvi (apply hash-set (keys g))]
    (if (empty? unvi)
      dsts
      (let [unvi  (disj unvi curr)
            nextn (first (sort-by #(% dsts) unvi))

clojens

;;Using the Cassowary constraint solver from ClojureScript
;;This demo shows using multimethods for readable constraint syntax using +, -, and =.
;;Output is a row of circles with random radii spaced so that the space between their boundaries is uniform.

(ns c2.main
  ;;refer-clojure :exclude is currently broken in ClojureScript master
  ;;Ticket open: http://dev.clojure.org/jira/browse/CLJS-114
  ;;Fix applied here: https://github.com/lynaghk/clojurescript/tree/114-refer-clojure-exclude
  (:refer-clojure :exclude [+ - =])
  

clojens

(ns pigeonhole-sort)

(defn int-sort [s]
  (let [listmap (reduce #(update-in
                           (update-in %1 [%2] (fnil inc 0))
                           [:max] max %2) {:max 0} s)]
    (mapcat #(repeat (get listmap % 0) %)
            (range (inc (:max listmap))))))

clojens

;variants of the code from point #2 of:
; http://www.tbray.org/ongoing/When/200x/2009/12/01/Clojure-Theses

;original

(apply merge-with +
  (pmap count-lines
    (partition-all *batch-size*
      (line-seq (reader filename)))))

clojens

;;
;; NS CHEATSHEET
;;
;; * :require makes functions available with a namespace prefix.
;;
;; * :use makes functions available without a namespace prefix
;;   (i.e., refers functions to the current namespace).
;;
;; * :import refers Java classes to the current namespace.
;;