Khwilo Kabaka khwilo

Linux simple performance tweaks

Change the I/O Scheduler

Open $ vim /etc/default/grub then add elevator=noop next to GRUB_CMDLINE_LINUX_DEFAULT. Run $ update-grub and $ cat /sys/block/sda/queue/scheduler to be sure that noop is being used:

$ vim /etc/default/grub
$ update-grub
$ cat /sys/block/sda/queue/scheduler

[noop] deadline cfq

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

Stores data elements based on an sequential, most commonly 0 based, index.
Based on tuples from set theory.

How to seed a Rails database with a CSV file

1. Setup

First, Create a folder inside of lib called seeds

Put your CSV file example.csv into the lib/seeds folder. In the example below, the file is called real_estate_transactions.csv

Make sure you've created a resource with the appropriate columns to match your seed data. The names don't have to match up.

	/**
	* Filters an array of objects using custom predicates.
	*
	* @param {Array} array: the array to filter
	* @param {Object} filters: an object with the filter criteria
	* @return {Array}
	*/
	function filterArray(array, filters) {
	const filterKeys = Object.keys(filters);
	return array.filter(item => {

	Africa/Abidjan
	Africa/Accra
	Africa/Addis_Ababa
	Africa/Algiers
	Africa/Asmara
	Africa/Asmera
	Africa/Bamako
	Africa/Bangui
	Africa/Banjul
	Africa/Bissau

	admin account info" filetype:log
	!Host=. intext:enc_UserPassword=* ext:pcf
	"# -FrontPage-" ext:pwd inurl:(service \| authors \| administrators \| users) "# -FrontPage-" inurl:service.pwd
	"AutoCreate=TRUE password=*"
	"http://:@www” domainname
	"index of/" "ws_ftp.ini" "parent directory"
	"liveice configuration file" ext:cfg -site:sourceforge.net
	"parent directory" +proftpdpasswd
	Duclassified" -site:duware.com "DUware All Rights reserved"
	duclassmate" -site:duware.com

	cd ~
	##If you want to install OpenJDK
	#sudo apt-get update
	#sudo apt-get install openjdk-8-jre-headless -y

	###Or if you want to install Oracle JDK, which seems to have slightly better performance
	sudo add-apt-repository ppa:webupd8team/java
	sudo apt-get update
	sudo apt-get install oracle-java8-installer

	#!/bin/bash
	# TODO: skip tiny files (so small they couldn't be photos)
	# TODO: make sure sym links and other file system oddities are handled

	#
	# Constants
	#
	CHAR_COUNT=12
	BLOCK_COUNT=6
	SKIP_SIZE=3 # Every new block is sampled by skipping this amount of blocks to the next position

	#!/usr/bin/ruby
	require 'rss'

	# Usage
	# $ ./railscasts.rb http://railscasts.com/subscriptions/YOURRAILSCASTRSS/\/
	# episodes.rss
	# OR
	# $ ./railscasts.rb

	p 'Downloading rss index'