nadavrot

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

gist:5b52dd807f571cbb4790

top_gitdir() {
    local git_dir=$(git rev-parse --git-dir 2>/dev/null)
    if [ -n "${git_dir}" ]; then
        git_dir=$(realpath ${git_dir})
        echo ${git_dir/\/.git*/}
    fi
}

git_directories() {
    gtop || return

juanje

I was tired of Chrome eating all my laptop resources so I decided to put some limit to it with cgroup.

As I was using Ubuntu 12.04 with support for cgroup, I installed the package cgroup-bin and add the following group to the file /etc/cgconfig.conf:

group browsers {
    cpu {
#       Set the relative share of CPU resources equal to 25%
        cpu.shares = "256";
 }

msabramo

import contextlib


@contextlib.contextmanager
def stdchannel_redirected(stdchannel, dest_filename):
    """
    A context manager to temporarily redirect stdout or stderr

    e.g.:

jdowner

import QtQuick 1.0

Rectangle {
  height: 300
  width: 400
  color: "gray"

  // This text element is for visual feedback when the signal fires
  Text {
    text: "(empty)"

taylor

Using bitlbee with HipChat

Initial setup

• account add jabber USERNAME@chat.hipchat.com 'PASSWORD'
• account hipchat set nick_source full_name
• account hipchat set resource bot
• account hipchat on

rsvp

#!/usr/bin/env bash
#              bash 4.1.5(1)     Linux Ubuntu 10.04           Date : 2019-01-02
#
# _______________|  noise : ambient Brown noise generator (cf. white noise).
#
#           Usage:  noise  [minutes=59]  [band-pass freq center=1786]  [wave]
#                          ^minutes can be any positive integer.
#                           Command "noise 1" will display peak-level meter.
#
#    Dependencies:  play (from sox package)

markjaquith

#!/bin/bash
#
# git-svn-diff originally by (http://mojodna.net/2009/02/24/my-work-git-workflow.html)
# modified by mike@mikepearce.net
# modified by aconway@[redacted] - handle diffs that introduce new files
# modified by t.broyer@ltgt.net - fixes diffs that introduce new files
# modified by m@rkj.me - fix sed syntax issue in OS X
#
# Generate an SVN-compatible diff against the tip of the tracking branch