Tárliton Basso de Godoy Tarliton

Grr this took hours to figure out. I was trying to install MJPG-streamer and running VLC command lines and all this crap but nothing worked.

First install motion:

~> sudo apt-get install motion

Then create a config file:

~> mkdir ~/.motion

~> nano ~/.motion/motion.conf

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).

What is sync.Pool in golang and How to use it

sync.Pool (1/2)

Many Go libraries include custom thread-safe free lists, like this:

var objPool = make(chan *Object, 10)

func obj() *Object {

select {

How many instances do you need?

There's a theoretical tool we can use, the number of instances must obey Little's Law. The definition from Wikipedia is so hard to understand. So, basically, we just need to know the formula

Number of application instances = Average number of requests per second (requests/second) * Average response time (second)

Application Instances, its job is process a single request dependently and send it back to client. When using Puma in threaded mode, application instance is the entire Puma process, when using MRI, JRuby,each thread counts as an application instance. When using Unicorn, Puma (clustered) or Passenger, your application instance is each worker process.

I recently happened upon a very interesting implementation of popen() (different API, same idea) called popen-noshell using clone(2), and so I opened an issue requesting use of vfork(2) or posix_spawn() for portability. It turns out that on Linux there's an important advantage to using clone(2). I think I should capture the things I wrote there in a better place. A gist, a blog, whatever.

This is not a paper. I assume reader familiarity with fork() in particular and Unix in general, though, of course, I link to relevant wiki pages, so if the unfamiliar reader is willing to go down the rabbit hole, they should be able to come ou

Golang CPU usage in docker

// test.go
package main

import (
	"fmt"

	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

	// $XDG_CONFIG_HOME/xkb/symbols/custom

	// Makes ALT + CAPS_LOCK act as 3rd level switch
	// Works sporadically
	partial modifier_keys
	xkb_symbols "alt_caps_mode_switch" {
	key <CAPS> {
	type[Group1]="PC_ALT_LEVEL2",
	[ Caps_Lock, ISO_Level3_Shift ]
	};

	from __future__ import print_function
	from math import sin, cos, radians
	import timeit

	'''
	A simple Python benchmark.

	Results on an overclocked AMD FX-8150 Eight-Core CPU @ 3.0 GHz, and
	an Intel Core i5-2410M CPU @ 2.30GHz.

	127.0.0.1 us.rdx2.lgtvsdp.com
	127.0.0.1 us.info.lgsmartad.com
	127.0.0.1 us.ibs.lgappstv.com
	127.0.0.1 us.lgtvsdp.com
	127.0.0.1 ad.lgappstv.com
	127.0.0.1 smartshare.lgtvsdp.com
	127.0.0.1 ibis.lgappstv.com

	# added after fork
	# from https://www.reddit.com/r/pihole/comments/6qmpv6/blacklists_for_lg_webos_tvs/ and others