Rafael Sliveira Cordeiro rafaelsc

General

Dataflow (Task Parallel Library)

Videos

Microsoft

Channel9: Beginner: TPL Dataflow Tour (Stephen Toub), 15min
Channel9: Advanced: Stephen Toub: Inside TPL Dataflow (Stephen Toub), 1h
Tech-Ed 2001: The Future of .NET Parallel Programming (Joseph Albahari) 1h10m

#petya #petrWrap #notPetya

Win32/Diskcoder.Petya.C

Ransomware attack.

About

This gist was built by the community of the researchers and was scribed by Kir and Igor from the QIWI/Vulners. We are grateful for the help of all those who sent us the data, links and information. Together we can make this world a better place!

Gist updates

Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 4096

General

Repos

System Design Cheatsheet

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

Basic Steps

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?

$/
  artifacts/
  build/
  docs/
  lib/
  packages/
  samples/
  src/
 tests/

CSS units

Recommendations of unit types per media type:

Media	Recommended	Occasional use	Infrequent use	Not recommended
Screen	em, rem, %	px	ch, ex, vw, vh, vmin, vmax	cm, mm, in, pt, pc
Print	em, rem, %	cm, mm, in, pt, pc	ch, ex	px, vw, vh, vmin, vmax

Relative units

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

	// Browser-Sync support for Cordova projects
	// To use this, add the following snippet as a after_run hook using something like
	// <hook type="after_prepare" src="hooks/browser-sync.js" />
	// Also add ws: 'unsafe-inline' to the CSP in index.html
	// The do Cordova run, and changing anything in www/ will live-reload the cordova app on emulator/device

	module.exports = function(context) {
	if (context.opts.options[0] === '--browser-sync-mode') {
	// Prepare was called by this script, so don't run the script again
	return;

	#!/bin/bash

	# generate new personal ed25519 ssh keys
	ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_ed25519 -C "rob thijssen <[email protected]>"
	ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_robtn -C "rob thijssen <[email protected]>"

	# generate new host cert authority (host_ca) ed25519 ssh key
	# used for signing host keys and creating host certs
	ssh-keygen -t ed25519 -f manta_host_ca -C manta.network