skdangi

Kafka benchmarks summary prepared from:
https://engineering.linkedin.com/kafka/benchmarking-apache-kafka-2-million-writes-second-three-cheap-machines
https://gist.github.com/jkreps/c7ddb4041ef62a900e6c

I had six machines each has the following specs

Intel Xeon 2.5 GHz processor with six cores
Six 7200 RPM SATA drives
32GB of RAM

skdangi

brew tap homebrew/versions
brew search gradle
brew install homebrew/versions/gradle112
gradle -version
brew link --overwrite gradle112
gradle -version

skdangi

Typing vagrant from the command line will display a list of all available commands.

Be sure that you are in the same directory as the Vagrantfile when running these commands!

Common Vagrant Commands

• vagrant up -- starts vagrant environment (also provisions only on the FIRST vagrant up)
• vagrant status -- outputs status of the vagrant machine
• vagrant halt -- stops the vagrant machine
• vagrant reload -- restarts vagrant machine, loads new Vagrantfile configuration
• vagrant provision -- forces reprovisioning of the vagrant machine

skdangi

public class ReverseKList {
	
	public static class Node{
		Node next;
		int value;
		
		public Node(int value){
			this.value = value;
		}

skdangi

public class CheckBalanced {
	private static class Node<T> {
		public Node(T value) {
			this.value = value;
		}
		Node successor;
		Node left;
		Node right;

skdangi

import java.util.Arrays;

public class PalindromeUtil {

	final static char NINE = '9';
	final static char ZERO = '0';

	public static char[] nextPalindrome(char[] sourceNumber) {
		if (null == sourceNumber || sourceNumber.length == 0) {
			throw new IllegalArgumentException("Not valid value");

skdangi

public class NodeSuccessor {

	// Node class;; ignoring getters and setters for simplicity
	private static class Node {
		public Node(int value) {
			this.value = value;
		}

		Node successor;
		Node left;

skdangi

import java.util.HashMap;
import java.util.Map;

public class LRUCache {

	private static class Database {
		private Map<Integer, Integer> map = new HashMap<Integer, Integer>() {
			{
				put(1, 1);
				put(2, 2);

skdangi

#!/usr/bin/env ruby
#
# Convert blogger (blogspot) posts to jekyll posts
#
# Basic Usage
# -----------
#
#   ./blogger_to_jekyll.rb feed_url
#
#  where `feed_url` can have the following format:

skdangi

Latency Comparison Numbers
--------------------------
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
Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
Read 4K randomly from SSD*              150,000   ns    0.15 ms