Matt Yoho mattyoho

Setup a Local Only Email Server (Linux, Unix, Mac)

1 - Point localhost.com to your machine

Most of programs will not accept an email using just @localhost as domain. So, edit /etc/hosts file to make the domain localhost.com point to your machine, including this content to the file:

127.0.0.1 localhost.com

2 - Install Postfix

Update

If you're looking at this in 2016 and beyond, I strongly recommend investigating real headless Chrome: https://chromium.googlesource.com/chromium/src/+/lkgr/headless/README.md

Windows and Mac users might find using Justin Ribeiro's Docker setup useful here while full support for these platforms is being worked out.

You can use chrome --headless on Linux as of M57 but note you'll need to build the binaries yourself for now.

The metabug for adding headless mode to Chromium is over here.

General Background and Overview

Probabilistic Data Structures for Web Analytics and Data Mining : A great overview of the space of probabilistic data structures and how they are used in approximation algorithm implementation.
Models and Issues in Data Stream Systems
Philippe Flajolet’s contribution to streaming algorithms : A presentation by Jérémie Lumbroso that visits some of the hostorical perspectives and how it all began with Flajolet
Approximate Frequency Counts over Data Streams by Gurmeet Singh Manku & Rajeev Motwani : One of the early papers on the subject.
[Methods for Finding Frequent Items in Data Streams](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.187.9800&rep

Passing TCP socket descriptors around

In linux, normally, it is impossible to "bind()" to the same TCP port twice. If you try to bind to the same port from second proces unix processes you'll see:

socket.error: [Errno 98] Address already in use

Install

brew install logrotate

add to .bash_profile

export PATH=${PATH}:/usr/local/sbin

restart terminal just to check the logrotate command returns something

logrotate -?

	package main

	import (
	"fmt"
	"io"
	"os/exec"

	bf "gopkg.in/russross/blackfriday.v2"
	)

	Latency Comparison Numbers
	--------------------------
	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
	Send 1K bytes over 1 Gbps network 10,000 ns 0.01 ms
	Read 4K randomly from SSD* 150,000 ns 0.15 ms

	Thread #0 was switched to 125044 times
	Thread #1 was switched to 124994 times
	Thread #2 was switched to 124994 times
	Thread #3 was switched to 124993 times
	Thread #4 was switched to 124993 times
	Thread #5 was switched to 124994 times
	Thread #6 was switched to 124994 times
	Thread #7 was switched to 124993 times

	1,000,000 thread switches took 2.143874 seconds

	#include <stdio.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <sys/mman.h>
	#include <unistd.h>
	#include <fcntl.h>
	#include <stdlib.h>

	#define CHECK(thing) if (!(thing)) { perror(#thing); exit(1); }
	#define MAX_PAGE_IN 104857600

	# This is a shell archive. Remove anything before this line, then
	# unpack it by saving it in a file and typing "sh file". (Files
	# unpacked will be owned by you and have default permissions.)
	#
	# This archive contains:
	# Makefile ping.1 ping.c ping.shar newping.1 newping.c

	echo x - Makefile
	cat > "Makefile" << '//EOF Makefile//'
	# Revised to compile under SunOS 4.1.x (no longer necessary to install