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@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 13:16 — forked from jboner/latency.txt
Latency numbers every programmer should know

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

@brandonb927
brandonb927 / osx-for-hackers.sh
Last active July 24, 2024 15:28
OSX for Hackers: Yosemite/El Capitan Edition. This script tries not to be *too* opinionated and any major changes to your system require a prompt. You've been warned.
#!/bin/sh
###
# SOME COMMANDS WILL NOT WORK ON macOS (Sierra or newer)
# For Sierra or newer, see https://github.com/mathiasbynens/dotfiles/blob/master/.macos
###
# Alot of these configs have been taken from the various places
# on the web, most from here
# https://github.com/mathiasbynens/dotfiles/blob/5b3c8418ed42d93af2e647dc9d122f25cc034871/.osx
@rothgar
rothgar / main.yml
Last active March 8, 2024 07:16
Generate /etc/hosts with Ansible
# Idempotent way to build a /etc/hosts file with Ansible using your Ansible hosts inventory for a source.
# Will include all hosts the playbook is run on.
# Inspired from http://xmeblog.blogspot.com/2013/06/ansible-dynamicaly-update-etchosts.html
- name: "Build hosts file"
lineinfile: dest=/etc/hosts regexp='.*{{ item }}$' line="{{ hostvars[item].ansible_default_ipv4.address }} {{item}}" state=present
when: hostvars[item].ansible_default_ipv4.address is defined
with_items: groups['all']
@glinmac
glinmac / ambari-api
Last active December 23, 2020 02:00
ambari api examples
#!/bin/sh
AMBARI_USER=admin
AMBARI_PASSWORD=
CLUSTER_NAME=sandbox
AMBARI_API=http://127.0.0.1:8080/api/v1/clusters/$CLUSTER_NAME
BLUEPRINT_API=http://127.0.0.1:8080/api/v1/blueprints
hostname="hostname.example.com"
service="aservice"
@bishboria
bishboria / springer-free-maths-books.md
Last active June 8, 2024 06:39
Springer made a bunch of books available for free, these were the direct links
@yossorion
yossorion / what-i-wish-id-known-about-equity-before-joining-a-unicorn.md
Last active June 25, 2024 07:29
What I Wish I'd Known About Equity Before Joining A Unicorn

What I Wish I'd Known About Equity Before Joining A Unicorn

Disclaimer: This piece is written anonymously. The names of a few particular companies are mentioned, but as common examples only.

This is a short write-up on things that I wish I'd known and considered before joining a private company (aka startup, aka unicorn in some cases). I'm not trying to make the case that you should never join a private company, but the power imbalance between founder and employee is extreme, and that potential candidates would

@pjf
pjf / .bash_colours
Created April 27, 2017 06:56
pjf's shell prompt with taskwarrior and git
# Reset
Color_Off='\[\e[0m\]' # Text Reset
# Regular Colors
Black='\[\e[0;30m\]' # Black
Red='\[\e[0;31m\]' # Red
Green='\[\e[0;32m\]' # Green
Yellow='\[\e[0;33m\]' # Yellow
Blue='\[\e[0;34m\]' # Blue
Purple='\[\e[0;35m\]' # Purple
@jgreat
jgreat / README.md
Last active August 28, 2023 19:07
Rancher 2.0 Terraform AWS example.

Set up a 3 node HA rancher cluster.

This will create and prep nodes for RKE. This uses the default vpc and subnets.

We create:

  • SSH Key Pair
  • Security Groups
  • 3 Instances
  • ELB for 80/443 points to the 3 instances.
@ssebelius
ssebelius / Engineering Ladders.md
Last active August 29, 2023 17:42