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

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

lelandbatey

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results

tzmartin

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>CFBundleExecutable</key>
    <string>myapp</string>
    <key>CFBundleIdentifier</key>
    <string>com.pocketgophers.myapp</string>
    <key>CFBundleURLTypes</key>
    <array>

gregneagle

#!/usr/bin/python

import os
import sys

from CoreFoundation import (CFPreferencesAppValueIsForced,
                            CFPreferencesCopyAppValue,
                            CFPreferencesCopyValue,
                            kCFPreferencesAnyUser,
                            kCFPreferencesAnyHost,

pudquick

from ctypes import CDLL

loginPF = CDLL('/System/Library/PrivateFrameworks/login.framework/Versions/Current/login')
result = loginPF.SACLockScreenImmediate()

pudquick

from ctypes import CDLL, c_uint, byref, create_string_buffer
libc = CDLL('/usr/lib/libc.dylib')

def sysctl(name):
    size = c_uint(0)
    libc.sysctlbyname(name, None, byref(size), None, 0)
    buf = create_string_buffer(size.value)
    libc.sysctlbyname(name, buf, byref(size), None, 0)
    return buf.value

bruienne

DMG/PKG Linux notes

Mounting DMGs w/ HFS partitions:

http://linuxforums.org.uk/index.php?topic=1072.0

Tools needed:

apt-get install hfsplus hfsutils hfsprogs dmg2img

wsargent

303 See Other

Location: https://github.com/wsargent/docker-cheat-sheet

Hi there!

The docker cheat sheet has moved to a Github project under https://github.com/wsargent/docker-cheat-sheet.

Please click on the link above to go to the cheat sheet.

jvns

(You can comment here.)

Here I'm trying to understand what happens when I run

./hello

#include