Koushik Naskar Koushikphy

High-Performance Matrix Multiplication

This is a short post that explains how to write a high-performance matrix multiplication program on modern processors. In this tutorial I will use a single core of the Skylake-client CPU with AVX2, but the principles in this post also apply to other processors with different instruction sets (such as AVX512).

Intro

Matrix multiplication is a mathematical operation that defines the product of

Squashing Git Commits

The easy and flexible way

This method avoids merge conflicts if you have periodically pulled master into your branch. It also gives you the opportunity to squash into more than 1 commit, or to re-arrange your code into completely different commits (e.g. if you ended up working on three different features but the commits were not consecutive).

Note: You cannot use this method if you intend to open a pull request to merge your feature branch. This method requires committing directly to master.

Switch to the master branch and make sure you are up to date:

	import sqlite3
	import multiprocessing
	'''
	This program starts a daemon process that listens on a queue.
	It then starts 10 processes that place integers in the queue.
	The listening daemon pulls the integers out of the queue and
	stores them in the database.
	'''
	DB_FILENAME = 'db.sqlite'

	var app = require('app');
	var Menu = require('menu');
	var Tray = require('tray');

	var appIcon = null;

	app.on('ready', function(){
	// image is null, so image will not be shown in menu bar
	// so click around on the system menu bar to locate the space where the tray icon is
	appIcon = new Tray(null);

	#!/usr/bin/env python
	#
	# Very basic example of using Python and IMAP to iterate over emails in a
	# gmail folder/label. This code is released into the public domain.
	#
	# RKI July 2013
	# http://www.voidynullness.net/blog/2013/07/25/gmail-email-with-python-via-imap/
	#
	import sys
	import imaplib

	#!/usr/bin/env python

	import sqlite3

	class dbopen(object):
	"""
	Simple CM for sqlite3 databases. Commits everything at exit.
	"""
	def __init__(self, path):
	self.path = path

	Nothing here, just a Gist hack to display the title correctly on Gist.
	(Prefix the title of this file with a dot on Gist.)