regiszanandrea

Items = rows

Hash Key: Partition Key
Range Key: Sort Key

Primary key: 
  - Partition key
  - Partition key + Sort Key (unique)
  
LSI (Local Secondary Index): use when partition key is the same of the primary key

vomnes

package main

import (
	"fmt"
	"log"

	"golang.org/x/sys/unix"
)

// https://www.gnu.org/software/libc/manual/html_node/Sockets.html#Sockets

halfelf

https://web.archive.org/web/20110219163448/http://howtohft.wordpress.com/2011/02/15/how-to-build-a-fast-limit-order-book/

The response to my first few posts has been much larger than I’d imagined and I’d like to thank everyone for the encouragement.

If you’re interested in building a trading system I recommend first reading my previous post on general ideas to keep in mind.

My first really technical post will be on how to build a limit order book, probably the single most important component of a trading system. Because the data structure chosen to represent the limit order book will be the primary source of market information for trading models, it is important to make it both absolutely correct and extremely fast.

To give some idea of the data volumes, the Nasdaq TotalView ITCH feed, which is every event in every instrument traded on the Nasdaq, can have data rates of 20+ gigabytes/day with spikes of 3 megabytes/second or more. The individual messages average about 20 bytes each so this means handling

cbrgm

#!/bin/bash
######################################################
# Basic settings
######################################################

# server base directory
RAGNAROK_DIR=/rAthena

# mysql database settings
MYSQL_ROOT_PW="changeme"

elfsternberg

use std::fmt;

enum FizzBuzzOr {
    Fizzbuzz(&'static str),
    Or(i32)
}

impl fmt::Display for FizzBuzzOr {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        use FizzBuzzOr::*;

cheery

WarpGPU abstractions

Vulkan appears to favor abstractions that are transparent and incremental. Meaning:

• A new abstraction can be introduced in isolation.
• Individual pieces in the abstraction layer can be left out or or substituted with a different one.

The following abstractions seem evident after studying

drgomesp

<?php

class Item
{
    public $name;
    public $parent;
    public function __construct($name, Item $parent = null)
    {
        $this->name = $name;
        $this->parent = $parent;

cezarguimaraes

local vstruct = require 'vstruct'

function Items(path)
	local buffer = io.open(path, 'rb')

	local signature = vstruct.readvals('u4', buffer)
	local itemCount, creatureCount, effectCount, distanceCount = vstruct.readvals('4 * u2', buffer)

	local items = {}

drgomesp

<?php

class DesvioPadrao 
{
       public function media();
       public function somaQuadradoDesvio();
       public function desvioPadraoPopulacional();
       public function desvioPadraoAmostral();
}

drgomesp

Curso online de Symfony

Formato

O curso será disponibilizado no formato de vídeos – screencasts – através do meu canal pessoal, no YouTube. Os capítulos terão relação entre sí no sentido de que, em capítulos futuros, partirei da premissa de que conceitos já abordados em capítulos anteriores já estão dominados pelo viewer.

Capítulos

#1 Instalação, estrutura de diretórios e Bundles