dbuduev

Latency Comparison Numbers (~2012)
----------------------------------
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

dbuduev

South Island Recommendations

Dunedin

Mt Cargill

Scenic viewpoint looking out over the whole Dunedin area. Short drive from the CBD

https://www.dunedin.govt.nz/community-facilities/walking-tracks/skyline-walks/mt-cargill

Long beach

dbuduev

Install NVM, NodeJS, Yarn via Homebrew

Prerequisites

• Homebrew should be installed (Command line tools for Xcode are included).

Getting start

Install NVM and NodeJS

1. Install nvm via Homebrew

dbuduev

let rootPromise = new Promise((resolve, reject) => reject('Bad promise'));

rootPromise
    .then(_ => {
        console.log("Promise resolved");
        return Promise.resolve(30);
    }, error => {
        console.log("Error", error);
        // return Promise.resolve(55); // prints Result 55
        return Promise.reject(44); // prints Catch 44

dbuduev

defmodule MySpawn do
  def spawn_monitor(mod, func, args) do
    root_pid = self()
    spawn(fn ->
      {pid, ref} = :erlang.spawn_monitor(mod, func, args)
      send(root_pid, pid)
      start_time = :calendar.local_time
      receive do
        {:DOWN, ^ref, :process, ^pid, why} -> print_on_exit(start_time, why)
      end

dbuduev

open System
open System.Windows.Forms
open System.Drawing

let count (a: _ [,]) x y =
  let m, n = a.GetLength 0, a.GetLength 1
  let mutable c = 0
  for x in x-1..x+1 do
    for y in y-1..y+1 do
      if x>=0 && x<m && y>=0 && y<n && a.[x, y] then

dbuduev

defmodule NonBlockingCache do
  use GenServer

  def start_link do
    GenServer.start_link(__MODULE__, [], name: :ets_page_cache)
  end

  def init(_) do
    :ets.new(:ets_page_cache, [:set, :named_table, :protected])
    Process.flag(:trap_exit, true)