Christoph Grabo asaaki

Tech Initiatives for marginalized groups

##mailinglists

##list of speakers

ClosedStruct

A stupidly simple implementation of a kind of "sorta immutable" struct that can be instantiated as conveniently as an OpenStruct but after instantiation it doesn't let me (easily) add fields or mutate them:

guy = ClosedStruct.new( name: "John", age: 23 )

# readers:
guy.name             #=> "John"
guy.age #=&gt; 23

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns                     on recent CPU
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 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 4X memory

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

Moved to git-repository: https://github.com/denji/awesome-http-benchmark

Tools

Located in alphabetical order (not prefer)

ab – slow and single threaded, written in C
apib – most of the features of ApacheBench (ab), also designed as a more modern replacement, written in C
autocannon – fast HTTP/1.1 benchmarking tool written in Node.js
baloo – Expressive end-to-end HTTP API testing made easy, written in Go (golang)

	#!/usr/bin/env ruby
	# encoding: utf-8

	require 'optparse'
	require 'redic'

	options = {
	port: 6379,
	host: '127.0.0.1',
	match: nil,

	source 'https://rubygems.org'

	gem 'rake'
	gem 'lotus-router'
	gem 'lotus-controller'
	gem 'lotus-view'

	group :test do
	gem 'rspec'
	gem 'capybara'

	# Install ARCH Linux with encrypted file-system and UEFI
	# The official installation guide (https://wiki.archlinux.org/index.php/Installation_Guide) contains a more verbose description.

	# Download the archiso image from https://www.archlinux.org/
	# Copy to a usb-drive
	dd if=archlinux.img of=/dev/sdX bs=16M && sync # on linux

	# Boot from the usb. If the usb fails to boot, make sure that secure boot is disabled in the BIOS configuration.

	# Set swedish keymap

	package main

	import (
	"image"
	_ "image/gif"
	_ "image/jpeg"
	_ "image/png"
	"io"
	"mime"

	#! /bin/sh

	# If you often mistype "git add", you could alias "ad=add". Or, you could use
	# this script.

	random=$(( RANDOM % 3 ));

	case $random in
	0) echo "Buy Git! Now with 20% more rebase!";;
	1) echo "Merge, branch, AND rebase? But wait, there's more!";;