pagles / latency.markdown

Created October 11, 2016 14:53 — forked from hellerbarde/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

pagles / tmux_cheatsheet.markdown

Created October 18, 2016 08:54 — forked from henrik/tmux_cheatsheet.markdown

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

pagles / infra-secret-management-overview.md

Created June 22, 2017 14:05 — forked from maxvt/infra-secret-management-overview.md

Infrastructure Secret Management Software Overview

Currently, there is an explosion of tools that aim to manage secrets for automated, cloud native infrastructure management. Daniel Somerfield did some work classifying the various approaches, but (as far as I know) no one has made a recent effort to summarize the various tools.

This is an attempt to give a quick overview of what can be found out there. The list is alphabetical. There will be tools that are missing, and some of the facts might be wrong--I welcome your corrections. For the purpose, I can be reached via @maxvt on Twitter, or just leave me a comment here.

There is a companion feature matrix of various tools. Comments are welcome in the same manner.

pagles / nginx-to-ssh-tunnel.md

Last active January 31, 2019 14:53 — forked from gdamjan/README.md

Setup for an easy to use, simple reverse http tunnels with nginx and ssh. It's that simple there's no authentication at all.The end result, a single ssh command invocation gives you a public url for your web app hosted on your laptop.

What

A lot of times you are developing a web application on your own laptop or home computer and would like to demo it to the public. Most of those times you are behind a router/firewall and you don't have a public IP address. Instead of configuring routers (often not possible), this solution gives you a public URL that's reverse tunnelled via ssh to your laptop.

Because of the relaxation of the sshd setup, it's best used on a dedicated virtual machine just for this (an Amazon micro instance for example).

Requirements

pagles / The Best Medium-Hard Data Analyst SQL Interview Questions.md

Created June 26, 2022 12:29 — forked from monbang/The Best Medium-Hard Data Analyst SQL Interview Questions

The Best Medium-Hard Data Analyst SQL Interview Questions

By Zachary Thomas ([email protected], Twitter, LinkedIn)

**Tip: **See the Table of Contents (document outline) by hovering over the vertical line on the right side of the page

Background & Motivation

The first 70% of SQL is pretty straightforward but the remaining 30% can be pretty tricky.