whym

// benchmark Java/Scala BigInt/BitSet implementations

import scala.util.Random
import scala.collection.mutable
import scala.collection.immutable
import java.util.BitSet
import java.math.BigInteger

// derived from https://github.com/alexmasselot/benchmark-bitarray/blob/master/src/benchmark/bitarray/TimeIt.scala
def timeInMilli(n: Int, f: () => Unit) = {

djspiewak

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

1. CPU-bound
2. Blocking IO
3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

jessfraz

# Description: Boxstarter Script
# Author: Jess Frazelle <jess@linux.com>
# Last Updated: 2017-09-11
#
# Install boxstarter:
# 	. { iwr -useb http://boxstarter.org/bootstrapper.ps1 } | iex; get-boxstarter -Force
#
# You might need to set: Set-ExecutionPolicy RemoteSigned
#
# Run this boxstarter by calling the following from an **elevated** command-prompt:

djspiewak

Quick Tips for Fast Code on the JVM

I was talking to a coworker recently about general techniques that almost always form the core of any effort to write very fast, down-to-the-metal hot path code on the JVM, and they pointed out that there really isn't a particularly good place to go for this information. It occurred to me that, really, I had more or less picked up all of it by word of mouth and experience, and there just aren't any good reference sources on the topic. So… here's my word of mouth.

This is by no means a comprehensive gist. It's also important to understand that the techniques that I outline in here are not 100% absolute either. Performance on the JVM is an incredibly complicated subject, and while there are rules that almost always hold true, the "almost" remains very salient. Also, for many or even most applications, there will be other techniques that I'm not mentioning which will have a greater impact. JMH, Java Flight Recorder, and a good profiler are your very best friend! Mea

vcarl

I bundled these up into groups and wrote some thoughts about why I ask them!

If these helped you, I'd love to hear about it!! I'm on twitter @vcarl_ or send me an email carl.vitullo@gmail.com

Onboarding and the workplace

https://blog.vcarl.com/interview-questions-onboarding-workplace/

• How long will it take to deploy my first change? To become productive? To understand the codebase?
• What kind of equipment will I be provided? Will the company pay/reimburse me if I want something specific?

gvolpe

Shared State in pure Functional Programming

Newcomers to Functional Programming are often very confused about the proper way to share state without breaking purity and end up having a mix of pure and impure code that defeats the purpose of having pure FP code in the first place.

Reason why I decided to write up a beginner friendly guide :)

Use Case

We have a program that runs three computations at the same time and updates the internal state to keep track of the

gvolpe

Dependency Injection in Functional Programming

There exist several DI frameworks / libraries in the Scala ecosystem. But the more functional code you write the more you'll realize there's no need to use any of them.

A few of the most claimed benefits are the following:

• Dependency Injection.
• Life cycle management.
• Dependency graph rewriting.

mohanpedala

Table of Contents

• set -e, -u, -x, -o pipefail
• set -e
• set -x
• set -u
• set -o pipefail
• Setting IFS
• Original Reference

set -e, -u, -x, -o pipefail

insdavm

WireGuard Site-to-Site

Accessing a subnet that is behind a WireGuard client using a site-to-site setup

Problem Summary

We want to access a local subnet remotely, but it is behind a NAT firewall and we can't setup port forwarding. Outgoing connections work, but all incoming connections get DROPPED by the ISP's routing policy.

Solution Summary

RaasAhsan

import java.util.concurrent.atomic.*;
import java.util.concurrent.*;

public class Main {
    private static ExecutorService executor = Executors.newFixedThreadPool(2);
    private static int iterations = 10000000;
  
    public static class Runner {
        // writes to canceled happen before a CAS on suspended
        // reads on canceled happen after a CAS on suspended