hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

mattratleph

vimdiff cheat sheet

##git mergetool

In the middle file (future merged file), you can navigate between conflicts with ]c and [c.

Choose which version you want to keep with :diffget //2 or :diffget //3 (the //2 and //3 are unique identifiers for the target/master copy and the merge/branch copy file names).

:diffupdate (to remove leftover spacing issues)

:only (once you’re done reviewing all conflicts, this shows only the middle/merged file)

avalonalex

# Thanks to this post:
# http://blog.ikato.com/post/15675823000/how-to-install-consolas-font-on-mac-os-x

$ brew install cabextract
$ cd ~/Downloads
$ mkdir consolas
$ cd consolas
$ curl -O http://download.microsoft.com/download/f/5/a/f5a3df76-d856-4a61-a6bd-722f52a5be26/PowerPointViewer.exe
$ cabextract PowerPointViewer.exe
$ cabextract ppviewer.cab

tsiege

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






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rtfpessoa

First verify the version of Java being used is not Sun Java 8 SDK

java -version

Check the latest version a build numbers in http://www.oracle.com/technetwork/java/javase/downloads/index.html

For url http://download.oracle.com/otn-pub/java/jdk/8u91-b14/jdk-8u91-linux-x64.tar.gz, the variables should be defined as:

java_base_version="8"
java_sub_version="11"

kgorman

// a list of useful queries for profiler analysis.  Starting with the most basic.
// 2.4 compatible
//

// output explained:
//
{
 "ts" : ISODate("2012-09-14T16:34:00.010Z"),  			// date it occurred
	"op" : "query",						// the operation type
	"ns" : "game.players",					// the db and collection

MikeRixWolfe

#!/usr/bin/env python

import json
import os
import requests
import time

debug = False
debug_path = 'debug'

lopezjurip

OUTDATED, see comments below

Install Homebrew:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Update Homebrew formulae:

brew update

graymouser

/* 
After purchasing a humble book bundle, go to your download page for that bundle. 
Open a console window for the page and paste in the below javascript
*/ 
$('a').each(function(i){
   if ($.trim($(this).text()) == 'MOBI') {
      $('body').append('<iframe id="dl_iframe_'+i+'" style="display:none;">');
      document.getElementById('dl_iframe_'+i).src = $(this).data('web');
   }
});

astanush

Google Calendar notifications

Create a Gmail filter that will find all Google Calendar-related emails. I use it to apply a label to the emails so I can go and bulk delete them later.

(("invitation" OR "updated invitation" OR "declined" OR "canceled event") AND (-collaborate OR -"invitation to edit")) AND (has:attachment)

Notes