UNINCORPORATED FACTS
- _tickCallback processes the process.nextCallback queue
- setTimeout cannot have a timeout smaller than 1
- domains make changes
There are two important things to remember about the Node event loop. The
/* | |
* 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'; |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
/* | |
* MCrypt API available online: | |
* http://linux.die.net/man/3/mcrypt | |
*/ | |
#include <mcrypt.h> |
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 |
<?php | |
$currency_symbols = array( | |
'AED' => 'د.إ', // ? | |
'AFN' => 'Af', | |
'ALL' => 'Lek', | |
'AMD' => '', | |
'ANG' => 'ƒ', | |
'AOA' => 'Kz', // ? | |
'ARS' => '$', | |
'AUD' => '$', |
VERSION=0.20.6 | |
sudo apt-get update | |
sudo apt-get install openjdk-6-jdk | |
wget https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-$VERSION.deb | |
sudo dpkg -i elasticsearch-$VERSION.deb | |
# be sure you add "action.disable_delete_all_indices" : true to the config!! |
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
(by @andrestaltz)
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.
# 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. |
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 |