debasishg

Performance Engineering, Hardware and cache awareness with algorithm and data structures

1. Parallel Computing Course - Stanford CS149, Fall 2023
2. Performance-Aware Programming Series by Casey Muratori
3. Algorithms for Modern Hardware
4. Computer Systems: A Programmer's Perspective, 3/E - by Randal E. Bryant and David R. O'Hallaron, Carnegie Mellon University
5. Performance Engineering Of Software Systems - am MITOCW course
6. Parallel Programming 2020 by NHR@FAU
7. Cpu Caches and Why You Care - by Scott Meyers

aswinsekar

# delete local branches that no longer have remote reference
git fetch -p && for branch in $(git for-each-ref --format '%(refname) %(upstream:track)' refs/heads | awk '$2 == "[gone]" {sub("refs/heads/", "", $1); print $1}'); do git branch -D $branch; done

# delete files that are being ignored by git(.gitignore) under a directory
git clean -xdn # dry run all the files that will list all the gitignore files under the directory
git clean -xdf # to clean the files that are ignored
# to delete all the files in the git repo, execute the command in the root directory

# clone all repos of an org (requires ruby1.9+)
curl -s https://api.github.com/orgs/[ORGANIZATION]/repos | ruby -rjson -e 'JSON.load(STDIN.read).each {|repo| %x[git clone #{repo["ssh_url"]} ]}'

theodorosploumis

Profile	download (kb/s)	upload (kb/s)	latency (ms)
Native	0	0	0
GPRS	50	20	500
56K Dial-up	50	30	120
Mobile EDGE	240	200	840
2G Regular	250	50	300
2G Good	450	150	150
3G Slow	780	330	200

xeoncross

# Assuming your have installed the following:
#
# brew install ufraw imagick ffmpeg
# apt-get install ufraw imagick ffmpeg

# Convert to JPG's
for img in *.CR2; do convert -resize 1920 "$img" "$img.jpg"; print "$img"; done

# Make a video

paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

Wind4

/*!
Math.uuid.js (v1.4)
http://www.broofa.com
mailto:[email protected]

Copyright (c) 2010 Robert Kieffer
Dual licensed under the MIT and GPL licenses.
*/

/*

kevincennis

Installing V8 on a Mac

Prerequisites

• Install Xcode (Avaliable on the Mac App Store)
• Install Xcode Command Line Tools (Preferences > Downloads)
• Install depot_tools
  • $ git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
  • $ nano ~/.zshrc
  • Add path=('/path/to/depot_tools' $path)

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

mattlewissf

git add -p is your friend

git add -p is basically "git add partial (or patch)"

Patch mode allows you to stage parts of a changed file, instead of the entire file. This allows you to make concise, well-crafted commits that make for an easier to read history. This feature can improve the quality of the commits. It also makes it easy to remove parts of the changes in a file that were only there for debugging purposes - prior to the commit without having to go back to the editor.

It allows you to see the changes (delta) to the code that you are trying to add, and lets you add them (or not) separately from each other using an interactive prompt. Here's how to use it:

from the command line, either use

• git add -p

mikeal

var portrange = 45032

function getPort (cb) {
  var port = portrange
  portrange += 1

  var server = net.createServer()
  server.listen(port, function (err) {
    server.once('close', function () {
      cb(port)