Jony Vesterman Cohen cohenjo

README

This is an example of a socket-activated per-connection service (which is usually referred to as inetd-like service). A thorough explanation can be found at http://0pointer.de/blog/projects/inetd.html.

Define a socket unit

The key point here is to specify Accept=yes, which will make the socket accept connections (behaving like inetd) and pass only the resulting connection socket to the service handler.

Removal of McAfee from OSX

Note: This was written in 2015, it may be out of date now.

There are a lot of commands here which I use sudo if you don't know what you're doing with sudo, especially where I rm you can severely screw up your system.

There are many reasons which you would want to remove a piece of software such as McAfee, such as not wanting it to hammer your CPU during work hours which seems like primetime for a virus scan.

I intend this to be a living document, I have included suggestions from peoples' replies.

	create type numeric_quartiles_plus as (
	min float,
	q05 float,
	q10 float,
	q25 float,
	q50 float,
	q75 float,
	q90 float,
	q95 float,
	max float,

	#!/bin/bash

	# remove existing 9.3 installation
	sudo /etc/init.d/postgresql stop
	sudo apt-get --force-yes -fuy remove --purge postgresql postgresql-9.1 postgresql-client

	# install 9.4
	sudo apt-get install python-software-properties
	sudo add-apt-repository 'deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main 9.4'
	sudo apt-get update

	#!/bin/bash

	# remove existing 9.1 installation
	sudo /etc/init.d/postgresql stop
	sudo apt-get --force-yes -fuy remove --purge postgresql postgresql-9.1 postgresql-client

	# install 9.3
	sudo apt-get install python-software-properties
	sudo add-apt-repository 'deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main'
	sudo apt-get update

	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