xk

(function run () {
  
  //2013.09.27 jorge@jorgechamorro.com
  //Shows that node's timers are borken and often execute out of order
  
  console.log('\nBEGIN');
  var MAX= 666;
  var last= 0;
  var items= 0;
  var errores= 0;

xk

//plistread.js, 2012-12-30 jorge@jorgechamorro.com

var plist= require('plist');
var shell= require('child_process').exec;
var puts= console.log;

//process.argv[0] -> "node"
//process.argv[1] -> "plistread.js"
//process.argv[2] -> inputFile
//process.argv[3..n] -> property list keys

xk

(function buscarVariablesGlobales (dirtySet, cleanSet) {
    //© 2013-02-19 jorge@jorgechamorro.com
    dirtySet= document.body.appendChild(document.createElement('iframe'));
    cleanSet= Object.getOwnPropertyNames(dirtySet.contentWindow);
    dirtySet.parentNode.removeChild(dirtySet);
    dirtySet= Object.getOwnPropertyNames(function () { return this }());
    return dirtySet.filter(function (v,i,o) { return cleanSet.indexOf(v) < 0 });
})()

xk

$ node timers.js 
setInterval(ƒ,1) -> (µs) :
 [ 1477,
  1172,
  1071,
  1084,
  1122,
  1145,
  1064,
  1062,

xk

//2012-09-13 jorge@jorgechamorro.com

var ctr, i, t, k= 1e8;

function ƒ (i) { ctr+= i }
function begin () { i= k, ctr= 0; while (Date.now() === (t= Date.now())) ; }
function end (s,t) { console.log(s+ ((Date.now()- t)*1e6/k).toFixed(2)+ 'ns') }


begin();

xk

//2012-06-28 js_vs_c.js

var c= 0; 
var t= Date.now()+1e3;
while (c++, (now= Date.now()) < t) ;

console.log(c);

xk

//2012-06-28 js_vs_c.c

#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>

long long DateNow () {
    struct timeval time;
    gettimeofday(&time, NULL);
    return (long long) ((time.tv_sec*  1000000) + time.tv_usec);

xk

//2012-06-28 functionCall.c jorge@jorgechamorro.com

/*
$ gcc -O0 /Users/jorge/Desktop/functionCall.c 
$ ./a.out
without a function call: 2.789478 ns per iteration
with a function call   : 3.574004 ns per iteration

With the function call it's 28.124473 percent slower than without the function call
*/

xk

unibody:node-threads-a-gogo jorge$ which node
/Users/jorge/JAVASCRIPT/binarios/bin/node
unibody:node-threads-a-gogo jorge$ node -v
v0.6.17
unibody:node-threads-a-gogo jorge$ node -e 'console.log(process.versions)'
{ node: '0.6.17',
  v8: '3.6.6.25',
  ares: '1.7.5-DEV',
  uv: '0.6',
  openssl: '0.9.8l' }

xk

// 2012-05-19 jorge@jorgechamorro.com

var o;
function boot () {
  o= {};
  var i= 7e6;
  while (i--) {
    var key= i.toString(36);
    o[key]= { id:key };
  }