Danil Pismenny dapi

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime and ffmpeg.

Forked from https://gist.github.com/dergachev/4627207. Updated to use a palette to improve quality and skip gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

Macbook Pro - Ubuntu Install

Requirements

2 USB drives > 2GB

Pre-Install

Create bootable USB drive

Grab the latest Ubuntu Desktop iso image

Finding a Ruby memory leak using a time analysis

When developing a program in Ruby, you may sometimes encounter a memory leak. For a while now, Ruby has a facility to gather information about what objects are laying around: ObjectSpace.

There are several approaches one can take to debug a leak. This discusses a time-based approach, where a full memory dump is generated every, say, 5 minutes, during a time that the memory leak is showing up. Afterwards, one can look at all the objects, and find out which ones are staying around, causing the

Введение

Начать стоит отсюда. Не пугайтесь то, что это книга по незнакомой OS, эти термины практически везде одинаковые и здесь они изложены в понятной для начинающих форме.

http://www.qnx.com/developers/docs/6.4.1/neutrino/getting_started/s1_procs.html

Прочесть нужно треть главы до подраздела "Starting a process", если С не пугает, читайте полностью. После прочтения вы будете понимать, что такое process, thread, mutex, priorites, semaphores, scheduler, contex-switch, kernel states.

Ruby

	if defined?(NewRelic)
	module NewRelic
	module Agent
	module Instrumentation
	class Grape < ::Grape::Middleware::Base
	def before
	begin
	NewRelic::Agent.set_transaction_name(transaction_name,
	category: :rack)
	rescue => e

	/** @jsx React.DOM */

	'use strict';

	var React = require('react');


	var AnimatableComponent = React.createClass({
	propTypes: {
	tag: React.PropTypes.component.isRequired,

	tell application "QuickTime Player" to activate
	tell application "System Events"
	activate
	--set UI elements enabled to true
	tell process "QuickTime Player"
	click menu item "New Screen Recording" of menu "File" of menu bar 1
	end tell
	end tell

	tell application "QuickTime Player"

	SELECT
	sum(heap_blks_read) as heap_read,
	sum(heap_blks_hit) as heap_hit,
	sum(heap_blks_hit) / (sum(heap_blks_hit) + sum(heap_blks_read)) as ratio
	FROM
	pg_statio_user_tables;

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048