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Evangelos Pappas epappas

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I'm Building Something Interesting :)
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@paolorossi
paolorossi / html5-video-streamer.js
Created March 7, 2012 13:21
Node.js HTML5 video streamer
/*
* Inspired by: http://stackoverflow.com/questions/4360060/video-streaming-with-html-5-via-node-js
*/
var http = require('http'),
fs = require('fs'),
util = require('util');
http.createServer(function (req, res) {
var path = 'video.mp4';
@bricef
bricef / AES.c
Last active March 4, 2023 11:29
A simple example of using AES encryption in Java and C.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* MCrypt API available online:
* http://linux.die.net/man/3/mcrypt
*/
#include <mcrypt.h>
@jboner
jboner / latency.txt
Last active May 8, 2024 16:32
Latency Numbers Every Programmer Should Know
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
@gibbs
gibbs / currency_symbols.php
Last active April 3, 2024 10:09
An array of currency symbols as HTML entities
<?php
$currency_symbols = array(
'AED' => '&#1583;.&#1573;', // ?
'AFN' => '&#65;&#102;',
'ALL' => '&#76;&#101;&#107;',
'AMD' => '',
'ANG' => '&#402;',
'AOA' => '&#75;&#122;', // ?
'ARS' => '&#36;',
'AUD' => '&#36;',
@mystix
mystix / install-elasticsearch-debian
Last active March 19, 2023 15:14 — forked from karussell/install-elasticsearch-debian
Install ElasticSearch on Debian
VERSION=0.20.6
sudo apt-get update
sudo apt-get install openjdk-6-jdk
wget https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-$VERSION.deb
sudo dpkg -i elasticsearch-$VERSION.deb
# be sure you add "action.disable_delete_all_indices" : true to the config!!

UNINCORPORATED FACTS

  • _tickCallback processes the process.nextCallback queue
  • setTimeout cannot have a timeout smaller than 1
  • domains make changes

Understanding the Node event loop

There are two important things to remember about the Node event loop. The

@trevnorris
trevnorris / perf-flame-graph-notes.md
Last active December 24, 2023 05:25
Quick steps of how to create a flame graph using perf

The prep-script.sh will setup the latest Node and install the latest perf version on your Linux box.

When you want to generate the flame graph, run the following (folder locations taken from install script):

sudo sysctl kernel.kptr_restrict=0
# May also have to do the following:
# (additional reading http://unix.stackexchange.com/questions/14227/do-i-need-root-admin-permissions-to-run-userspace-perf-tool-perf-events-ar )
sudo sysctl kernel.perf_event_paranoid=0
@staltz
staltz / introrx.md
Last active May 7, 2024 09:38
The introduction to Reactive Programming you've been missing
# Hello, and welcome to makefile basics.
#
# You will learn why `make` is so great, and why, despite its "weird" syntax,
# it is actually a highly expressive, efficient, and powerful way to build
# programs.
#
# Once you're done here, go to
# http://www.gnu.org/software/make/manual/make.html
# to learn SOOOO much more.
@BretFisher
BretFisher / .travis.yml
Created February 15, 2016 21:26
Travis-CI Docker Image Build and Push to AWS ECR
sudo: required #is required to use docker service in travis
language: php #can be any language, just php for example
services:
- docker # required, but travis uses older version of docker :(
install:
- echo "install nothing!" # put your normal pre-testing installs here