cjbischoff

# KMS.tf

resource "aws_kms_key" "kms_key" {
  policy = <<POLICY
{
  "Version": "2012-10-17",
  "Id": "${var.name}-key",
  "Statement": [
    {
      "Sid": "Enable IAM User Permissions",

cjbischoff

variable "bucket_name" {}

variable "name" {}

variable "s3logs_bucket_name" {}

variable "database_kms_key_arn" {}

variable "read_only_roles" {
  type    = "list"

cjbischoff

#!/bin/bash
# Sometimes you need to move your existing git repository
# to a new remote repository (/new remote origin).
# Here are a simple and quick steps that does exactly this.
#
# Let's assume we call "old repo" the repository you wish
# to move, and "new repo" the one you wish to move to.
#
### Step 1. Make sure you have a local copy of all "old repo"
### branches and tags.

cjbischoff

/var/folders/4s/l39wbkz55tx10gb1lfdvj6th0000gn/T/python-build.20181120064129.76625 ~

11/20 06:41:31 [NOTICE] Downloading 1 item(s)

11/20 06:41:31 [NOTICE] Allocating disk space. Use --file-allocation=none to disable it. See --file-allocation option in man page for more details.
[#3fb641 6.1MiB/16MiB(37%) CN:1 DL:7.0MiB ETA:1s]
[#3fb641 13MiB/16MiB(80%) CN:1 DL:7.0MiB]

11/20 06:41:34 [NOTICE] Download complete: /private/var/folders/4s/l39wbkz55tx10gb1lfdvj6th0000gn/T/python-build.20181120064129.76625/Python-3.6.7.tar.xz

cjbischoff

Latency Comparison Numbers
--------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

cjbischoff

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

cjbischoff

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

cjbischoff

Latency Comparison Numbers
--------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

cjbischoff

#!/bin/bash
#
# Installs and upgrades OS X tools and command-line utils using [Homebrew] (www.brew.sh). 
# This will use GNU's available toolset.
#

# # #
# Function to install homebrew [ http://brew.sh ]
# # #
install_brew() {

cjbischoff

#!/bin/sh

if [ `which brew | grep 'brew$'` = "" ]; then
    ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
fi

if [ ! -e ~/.zshrc_local -o `grep '\$(brew --prefix coreutils)/libexec/gnubin' ~/.zshrc_local` = "" ]; then
    echo 'export PATH="$(brew --prefix coreutils)/libexec/gnubin:/usr/local/bin:$PATH"' >> ~/.zshrc_local
fi