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@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 — forked from jboner/latency.txt
Latency numbers every programmer should know
View latency.markdown

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
@mjnaderi
mjnaderi / install-arch.md
Last active May 25, 2020 — forked from mattiaslundberg/arch-linux-install
Install Arch Linux with Full Disk Encryption (LVM on LUKS)
View install-arch.md
@chrismdp
chrismdp / s3.sh
Last active May 21, 2020
Uploading to S3 in 18 lines of Shell (used to upload builds for http://soltrader.net)
View s3.sh
# You don't need Fog in Ruby or some other library to upload to S3 -- shell works perfectly fine
# This is how I upload my new Sol Trader builds (http://soltrader.net)
# Based on a modified script from here: http://tmont.com/blargh/2014/1/uploading-to-s3-in-bash
S3KEY="my aws key"
S3SECRET="my aws secret" # pass these in
function putS3
{
path=$1
@protocool
protocool / caveatPatchor.js
Created Feb 14, 2011
Sample caveatPatchor.js file for use in Propane 1.1.2 and above
View caveatPatchor.js
/*
As of version 1.1.2, Propane will load and execute the contents of
~Library/Application Support/Propane/unsupported/caveatPatchor.js
immediately following the execution of its own enhancer.js file.
You can use this mechanism to add your own customizations to Campfire
in Propane.
Below you'll find two customization examples.
@iros
iros / API.md
Created Aug 22, 2012
Documenting your REST API
View API.md

Title

<Additional information about your API call. Try to use verbs that match both request type (fetching vs modifying) and plurality (one vs multiple).>

  • URL

    <The URL Structure (path only, no root url)>

  • Method:

@mwunsch
mwunsch / emoji_image_replace.js
Last active May 6, 2020
Detect emoji unicode on a page, replace it with images (supplied by GitHub, for now). Goes great in your ~/.js
View emoji_image_replace.js
/**
*
* Here's a thing that will look through all the text nodes of a document, and
* upon encountering an emoji codepoint, will replace it with an image.
* For now, those images are pulled from GitHub, which isn't very nice, so I
* need to find a more suitable host.
*
* Much of this code was gleaned from staring at the minified GitHub JS.
*
* Copyright (c) 2013 Mark Wunsch. Licensed under the MIT License.
@elasticdog
elasticdog / vault-cp
Created Jul 27, 2018
A script to copy Vault secrets from one path to another
View vault-cp
#!/usr/bin/env bash
# ensure we were given two command line arguments
if [[ $# -ne 2 ]]; then
echo 'usage: vault-cp SOURCE DEST' >&2
exit 1
fi
source=$1
dest=$2
View c10k-test-client.c
// HTTP client for testing high connection concurrency
// Authors: Richard Jones and Rasmus Andersson
// Released in the public domain. No restrictions, no support.
#include <sys/types.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <stdlib.h>
#include <err.h>
#include <event.h>
#include <evhttp.h>
@Protonk
Protonk / prng.js
Last active Oct 18, 2019
Various PRNGs, implemented in javascript.
View prng.js
// Linear Congruential Generator
// Variant of a Lehman Generator
var lcg = (function() {
// Set to values from http://en.wikipedia.org/wiki/Numerical_Recipes
// m is basically chosen to be large (as it is the max period)
// and for its relationships to a and c
var m = 4294967296,
// a - 1 should be divisible by m's prime factors
a = 1664525,
// c and m should be co-prime
@h12w
h12w / goclean.sh
Last active Jul 21, 2019
golcean.sh does automatic checking on a Go package and its sub-packages.
View goclean.sh
#!/bin/bash
# The script does automatic checking on a Go package and its sub-packages, including:
# 1. gofmt (http://golang.org/cmd/gofmt/)
# 2. goimports (https://github.com/bradfitz/goimports)
# 3. golint (https://github.com/golang/lint)
# 4. go vet (http://golang.org/cmd/vet)
# 5. race detector (http://blog.golang.org/race-detector)
# 6. test coverage (http://blog.golang.org/cover)
set -e
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