Denis Kirpichenkov d0k1

Let's say you're using Ubuntu 13.04 (Raring Ringtail, released in April 2013) and it just went End-of-Life on you, because it's supported for only 6 months, and the deprecated packages are taken down after 12 months.

You'll probably figure this out the hard way. When you run sudo apt-get update, it will eventually report these errors:

Ign http://archive.ubuntu.com raring-updates/universe Sources/DiffIndex
Err http://security.ubuntu.com raring-security/main Sources
  404  Not Found [IP: 91.189.91.15 80]
Err http://security.ubuntu.com raring-security/universe Sources
  404  Not Found [IP: 91.189.91.15 80]

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

Install Graphviz

sudo apt-get install graphviz

#Clone jemalloc git clone https://github.com/jemalloc/jemalloc

Configurie jemalloc with profiling enabled

./configure --enable-prof --enable-stats --enable-debug --enable-fill make make install

	set +x
	# Add this as the 1st build Exec shell
	# Only for situations where you have 1 and only 1 executor per machine
	# And you don't care about processes being left running after the job run ends

	# Look for processes that have a BUILD_ID env var
	# that is NOT the same as the current job's BUILD_ID
	# nor same as dontKillMe

	echo "Killing orphan spawned processes..."

	package self.vpalepu.stackoverflow;

	import java.io.File;
	import java.io.FileInputStream;
	import java.io.IOException;

	import org.objectweb.asm.ClassReader;
	import org.objectweb.asm.ClassVisitor;
	import org.objectweb.asm.ClassWriter;
	import org.objectweb.asm.MethodVisitor;

	@Grab(group="org.seleniumhq.selenium", module="selenium-java", version="2.42.2")

	import org.openqa.selenium.*;
	import org.openqa.selenium.chrome.*;

	System.setProperty("webdriver.chrome.driver", "/Users/kostya/Downloads/chromedriver");

	ChromeOptions chromeOptions = new ChromeOptions();
	chromeOptions.addArguments("--verbose", "--ignore-certificate-errors");
	WebDriver driver = new ChromeDriver();

	#!/bin/bash

	# It is probably redundant if you set settings mentioned in https://gist.github.com/zekefast/42273658939724ba7c7a .
	# But anyway it will not hurt anybody (sure if you are not putting your production database to RAM :)).
	#
	# Look for more detailed description in follow articles:
	# - http://blog.vergiss-blackjack.de/2011/02/run-postgresql-in-a-ram-disk/
	#
	# ATTENTION:
	# DO NOT apply this approach if you store important data in postgresql cluster, because that could cause

	public void authenticate() {
	this.authenticateButton.click();
	new WebDriverWait(driver, 30).until(authenticated());
	}

	private Predicate<WebDriver> authenticated() {
	return new Predicate<WebDriver>() {
	@Override public boolean apply(WebDriver driver) {
	return isAuthenticated();
	}

	#!/bin/bash

	sudo kextunload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport
	sudo kextload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport


	[Unit]
	Description=High-performance, schema-free document-oriented database
	Documentation=man:mongod(1)
	After=network.target

	[Service]
	Type=forking
	User=mongodb
	Group=mongodb