jboner

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

wbzyl

SVG Essentials – Filters

This is a recreation (for the purpose of tinkering with an implementation in d3.js) of the example from the book SVG Essentials by J. David Eisenberg.

The <feColorMatrix> element allows to change color values in a following way.

cobyism

Deploying a subfolder to GitHub Pages

Sometimes you want to have a subdirectory on the master branch be the root directory of a repository’s gh-pages branch. This is useful for things like sites developed with Yeoman, or if you have a Jekyll site contained in the master branch alongside the rest of your code.

For the sake of this example, let’s pretend the subfolder containing your site is named dist.

Step 1

Remove the dist directory from the project’s .gitignore file (it’s ignored by default by Yeoman).

quchen

13:15 <xQuasar>      | HASKELL IS FOR FUCKIN FAGGOTS. YOU'RE ALL A BUNCH OF 
                     | FUCKIN PUSSIES
13:15 <xQuasar>      | JAVASCRIPT FOR LIFE FAGS
13:16 <luite>        | hello
13:16 <ChongLi>      | somebody has a mental illness!
13:16 <merijn>       | Wow...I suddenly see the error of my ways and feel 
                     | compelled to write Node.js!
13:16 <genisage>     | hi
13:16 <luite>        | you might be pleased to learn that you can compile 
                     | haskell to javascript now

tonylukasavage

// I'm using this now in my Alloy runtime testing to assert that the 
// proper styles are getting assigned to Titanium proxy objects. The
// deep comparison is necessary for objects like font in the style. So
// for my purposes the accuracy of the results far supercedes the lack
// of blazing performance with this code. I'm using underscore.js as
// it's part of Alloy, but isX() calls could easily be filled out in 
// a couple lines of JS.
//
// Obviously due to the use of JSON.stringify() the objects to be 
// compared need to be JSON serializable.

dypsilon

Frontend Development

Attention: the list was moved to

https://github.com/dypsilon/frontend-dev-bookmarks

This page is not maintained anymore, please update your bookmarks.

---

mathisonian

var Sequelize = require('sequelize');

module.exports = function(config) {
    
    var models = {};
    sequelize = new Sequelize(config.database, config.username, config.password, config.options);


    // Bootstrap models
    fs.readdirSync(__dirname).forEach(function (file) {

seboudry

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns                     on recent CPU
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 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs 4X memory

csfrancis

# Updated for Ruby 2.3
string_t = None

def get_rstring(addr):
  s = addr.cast(string_t.pointer())
  if s['basic']['flags'] & (1 << 13):
    return s['as']['heap']['ptr'].string()
  else:
    return s['as']['ary'].string()

ismell

dependencies:
  # Compute the assets once and cache them
  post:
    - bundle exec rake assets:precompile assets:clean_expired:
          environment:
            RAILS_GROUPS: assets
  cache_directories:
    - "public/assets"