postspectacular

(ns toxi.euler.problem59)

;; http://projecteuler.net/problem=59
;; solution by: toxi <k at postspectacular dot com>
;; 2012-12-23

(defn xor-decrypt
  "Applies bit-xor to all items in src using key as cyclic sequence."
  [src key] (map bit-xor src (cycle key)))

kellabyte

Description

I decided to hook up the node.js C libuv async IO library that uses IOCP on Windows and epoll/kqueue/event ports/etc. on Unix systems to handle HTTP traffic to test if this is a suitable HTTP front end for Dazzle.

There is no V8 javascript engine so it's not running node.js, only the libuv async IO eventing and some C for handling the HTTP parsing.

Setup

• libuv is using default settings, zero tuning has been done.
• Client requests coming from a single remote client machine (Linux) over the LAN.

jgrahamc

package main

import (
	"fmt"
	"runtime"
	"time"
)

func waitAround(die chan bool) {
	<- die

ericmoritz

*~
*.beam

louiszuckerman

#!/bin/bash
 
if [[ "$#" < "2" || "$#" > "3" ]]; then
  cat <<END
Glusterfs GFID resolver -- turns a GFID into a real file path
 
Usage: $0 <brick-path> <gfid> [-q]

  <brick-path> : the path to your glusterfs brick (required)
  

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

andreyvit

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

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

burke

ruby-1.9.3-p327 cumulative performance patch for rbenv

This installs a patched ruby 1.9.3-p327 with various performance improvements and a backported COW-friendly GC, all courtesy of funny-falcon.

Requirements

• rbenv
• ruby-build

You will also need a C Compiler. If you're on Linux, you probably already have one or know how to install one. On OS X, you should install XCode, and brew install autoconf using homebrew.

mperham

class TaxCode
  GENERATORS = {
    :us => lambda { |id| "US-#{id}" },
    :br => lambda { |id| "#{id + 9}-BRA" },
  }

  def self.generate(code, id)
    gen = GENERATORS[code] || raise ArgumentError, "No generator for country #{code}"
    gen.call(id)
  end