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

sloria

The Best of the Best Practices (BOBP) Guide for Python

A "Best of the Best Practices" (BOBP) guide to developing in Python.

In General

Values

• "Build tools for others that you want to be built for you." - Kenneth Reitz
• "Simplicity is alway better than functionality." - Pieter Hintjens

blackfalcon

Git-workflow vs feature branching

When working with Git, there are two prevailing workflows are Git workflow and feature branches. IMHO, being more of a subscriber to continuous integration, I feel that the feature branch workflow is better suited, and the focus of this article.

If you are new to Git and Git-workflows, I suggest reading the atlassian.com Git Workflow article in addition to this as there is more detail there than presented here.

I admit, using Bash in the command line with the standard configuration leaves a bit to be desired when it comes to awareness of state. A tool that I suggest using follows these instructions on setting up GIT Bash autocompletion. This tool will assist you to better visualize the state of a branc

jmvrbanac

#!/bin/bash
set +x

# Setup all of the pyenvs
export PATH="$HOME/.pyenv/bin:$PATH"
export CONFIGURE_OPTS='--enable-shared'
eval "$(pyenv init -)"
pyenv shell 2.7.6
pyenv virtualenvwrapper
pyenv rehash

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.

---

blakev

# Paramiko SSH Object with batch commands and stdin
# Blake VandeMerwe July 2014
#
# Adapted from Joe Linoff's code at http://joelinoff.com/blog/?p=905
# his did not work for me, so I fixed it and added some features.
#
import re
import string
import logging
import socket

rm-you

#!/bin/bash

# Set up the packages we need
apt-get update
apt-get install libffi-dev libssl-dev git vim libxml2-dev libsqlite3-dev libxslt1-dev -y

# Clone the repos we need
git clone https://github.com/openstack/barbican.git /tmp/barbican
git clone https://github.com/openstack-dev/devstack.git /tmp/devstack

pixeltrix

When should you use DateTime and when should you use Time?

It's a common misconception that [William Shakespeare][1] and [Miguel de Cervantes][2] died on the same day in history - so much so that UNESCO named April 23 as [World Book Day because of this fact][3]. However because England hadn't yet adopted [Gregorian Calendar Reform][4] (and wouldn't until [1752][5]) their deaths are actually 10 days apart. Since Ruby's Time class implements a [proleptic Gregorian calendar][6] and has no concept of calendar reform then there's no way to express this. This is where DateTime steps in:

>> shakespeare = DateTime.iso8601('1616-04-23', Date::ENGLAND)
=> Tue, 23 Apr 1616 00:00:00 +0000
>> cervantes = DateTime.iso8601('1616-04-23', Date::ITALY)
=> Sat, 23 Apr 1616 00:00:00 +0000

rm-you

#!/bin/bash

echo "Please use stackme.sh from https://github.com/rm-you/devstack_deploy instead! Always the latest:"
echo "bash <(curl -sL bit.do/devstack)"
exit

BARBICAN_PATCH=""
NEUTRON_LBAAS_PATCH=""
OCTAVIA_PATCH="refs/changes/30/278830/6"

johnsom

#!/bin/sh

MYIP=$(/sbin/ifconfig eth0|grep 'inet addr'|awk -F: '{print $2}'| awk '{print $1}');
COUNT=0
while true; do
    OUTPUT_STR="Welcome to $MYIP connection $COUNT\r"
    OUTPUT_LEN=${#OUTPUT_STR}
    echo -e "HTTP/1.0 200 OK\r\nContent-Length: ${OUTPUT_LEN}\r\n\r\n${OUTPUT_STR}" | sudo nc -l -p 80
    if [ $? == 0 ]; then
        let "COUNT++"