Roy Adventus zoedaemon

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

Change Log

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

[Unreleased] - yyyy-mm-dd

Here we write upgrading notes for brands. It's a team effort to make them as

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

Datatables reloading

( changing the content and the column structure).

Unfortunately I couldn't find a way to do it in one go. There is the table.fnDestroy(true); but this removes the <table> element from the page as well. We could use this but then we need to wrap the table element in a div in order to have a place where to recreate the table.

	"""This is an example of how to use async langchain with fastapi and return a streaming response.
	The latest version of Langchain has improved its compatibility with asynchronous FastAPI,
	making it easier to implement streaming functionality in your applications.
	"""
	import asyncio
	import os
	from typing import AsyncIterable, Awaitable

	import uvicorn
	from dotenv import load_dotenv

	##
	## HTTP Router benchmarks -- Nov 29, 2020 with Go 1.15.5 on Linux AMD 3950x
	##
	## This benchmark suite is based on https://github.com/julienschmidt/go-http-routing-benchmark
	## using the most up-to-date version of each pkg as of today. Each router has their own
	## pros and cons, so consider the designs of each router to suit your application.
	##
	## NOTE: the memory reports below by the go benchmark tool look quite wrong, as there must
	## be a bug somewhere in the go bench tool with the Go version I'm running. I will re-run
	## with future versions and report back. However, in general you'll want to look at the "ns/op"

	##
	## How to install mcrypt in php7.2 / php7.3
	## Linux / MacOS / OSX
	##

	## https://lukasmestan.com/install-mcrypt-extension-in-php7-2/



	#

	/**
	* globalizer.js
	* v0.2.1
	*
	* Copyright 2017, Mike McNeil (@mikermcneil)
	* MIT License
	*/
	(function(global, factory){
	var Vue;
	var _;

	global
	log /dev/log local0
	log /dev/log local1 notice
	chroot /var/lib/haproxy
	user haproxy
	group haproxy
	daemon

	# Default SSL material locations
	ca-base /etc/ssl/certs

	//how to replace all single quotes by double quotes:
	//search/replace, check regex.

	//search:
	'([^\']*)'

	//replace:
	"$1"