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

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

bkaradzic

Orthodox C++

What is Orthodox C++?

Orthodox C++ (sometimes referred as C+) is minimal subset of C++ that improves C, but avoids all unnecessary things from so called Modern C++. It's exactly opposite of what Modern C++ suppose to be.

Why not Modern C++?

brson

Edit: This list is now maintained in the rust-anthology repo.

• Introduction
  • Understanding Over Guesswork
  • An Alternative Introduction to Rust
  • Rust and CSV Parsing
• Ownership
  • Where Rust Really Shines
  • Rust Means Never Having to Close a Socket
• The Problem with Single-threaded Shared Mutability

XVilka

THIS GIST WAS MOVED TO TERMSTANDARD/COLORS REPOSITORY.

PLEASE ASK YOUR QUESTIONS OR ADD ANY SUGGESTIONS AS A REPOSITORY ISSUES OR PULL REQUESTS INSTEAD!

jFransham

Achieving warp speed with Rust

Contents:

• Number one optimization tip: don't
• Never optimize blindly
• Don't bother optimizing one-time costs
• Improve your algorithms
• CPU architecture primer
• Keep as much as possible in cache
• Keep as much as possible in registers

piscisaureus

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

expipiplus1

Multi user nix installation

Each section should be run as the user or as root, pay attention to which one!

Install nix single user

As $USER

curl https://nixos.org/nix/install | sh

mjlbach

WARNING: THIS GIST IS OUT OF DATE AND NO LONGER RELEVANT

• Native-comp was enabled by default in nixpgks
• Pgtk is not enabled by default, for that you can either override the derivation or use emacsPgtk from the nix-community emacs overlay if you don't want to build it yourself

Nix

Adding the overlay and configuring cachix

N0dr4x

#!/usr/bin/env python
# -*- coding: UTF-8 -*-
# Author: N0dr4x (n0dr4x@protonmail.com)

'''
Simple Scapy TCP Session class that provide ability
to : 
   - execute the 3-way handshake (eg. connect)
   - properly close connection (->FIN/ACK, <-FIN/ACK, ->ACK )
   - send automatic acknowledgment of received tcp data packet