timvisee

Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

Falsehoods

• There are always 24 hours in a day.
• February is always 28 days long.
• Any 24-hour period will always begin and end in the same day (or week, or month).

mikeash

class ArrayImpl<T> {
    var space: Int
    var count: Int
    var ptr: UnsafeMutablePointer<T>
    
    init(count: Int = 0, ptr: UnsafeMutablePointer<T> = nil) {
        self.count = count
        self.space = count
        

y0ast

There used to be a tutorial here for using Torch7 on EC2, but it's now outdated. It is best to use an EC2 image that already has Torch7 and CUDA stuff preinstalled.

elithrar

A quick "how to" on what you need to do to both setup AND recover a single-server PostgreSQL database using WAL-E

• WAL-E: https://github.com/wal-e/wal-e
• Assuming Ubuntu 12.04 LTS ("Precise")
• We'll be using S3. Make sure you have an IAM in a group with GetObject, ListBucket and PutObject on the bucket you want to use (and that it's not public).

Setup:

1. These packages:

jehiah

#!/bin/bash
#
# *************************************************
# chkconfig: 2345 99 99
# description: notify email address on system boot.
# *************************************************
# Installing:
# 1) save as /etc/rc.d/init.d/notify
# 2) set the desired email address in "MAILADD" variable
# 3) chmod a+w /etc/rc.d/init.d/notify

jehiah

#!/bin/bash
# Show the rate of swapping (in number of pages) between executions

OK=0
WARNING=1
CRITICAL=2
UNKNOWN=-1
EXITFLAG=$OK

WARN_THRESHOLD=1

jehiah

#!/bin/bash
# Copyright bitly, Aug 2011 
# written by Jehiah Czebotar

DATAFILE="/var/tmp/nagios_check_forkrate.dat"
VALID_INTERVAL=600

OK=0
WARNING=1
CRITICAL=2

fs111

Lingual - ANSI SQL for apache hadoop

Big Data Beers Berlin, October 16th 2013

Speaker

• André Kelpe | @fs111 | andre[at]concurrentinc[dot]com
• works for concurrent inc (http://concurrentinc.com)
  • company behind Cacading and Lingual

Cascading

dergachev

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

mattt

Howdy howdy, NSHipsters!

If you alloc init an NSCalendar, you'll notice that New Year's Eve falls on a Monday this year, a.k.a. "the day NSHipster is published every week". What fun!

So in celebration of the upcoming year++, I thought it'd be fun to compile a list of some of your favorite tips and tricks of the trade. Submit your favorite piece of Objective-C trivia, framework arcana, hidden Xcode feature, or anything else you think is cool, and you could have it featured in the year-end blowout article. Just comment on this gist below!

Here are a few examples of the kind of things I'd like to see:

• StaticObjcMethods from [Apple]((http://developer.apple.com/library/mac/#samplecode/CocoaTipsAndTricks/Introduction/Intro.html): Demonstrates how to use static Objective-C m