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Parallel RSpec Tests on CircleCI With JUnit XML Reports

You will learn how to run RSpec tests for your Ruby on Rails project on CircleCI with parallel jobs to shorten the running time of your CI build. Moreover, you will learn how to configure JUnit formatter to generate an XML report for your tests to show failing RSpec test examples nicely in CircleCI web UI. Finally, you will see how to automatically detect slow spec files and divide their test examples between parallel jobs to eliminate the bottleneck job that’s taking too much time to run tests.

Ruby Gems to Configure Your RoR Project

Here are the key elements you need:

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Principles to Handle Thousands of Connections in Java Using Netty

C10K problem is a term that stands for ten thousand concurrently handling connections. To achieve this, we often need to make changes in the settings of created network sockets and default settings of Linux kernel, monitor the usage of the TCP Send/Receive Buffers and Queues, and, in particular, adjust our application to be a good candidate for solving this problem.

In today's article, I'm going to discuss common principles that need to be followed if we want to build a scalable application that can handle thousands of connections. I will refer to Netty Framework, TCP, and Socket internals and some useful tools if you want to get some insights from your application and underlying system.

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Worker Threads: Node Parallelism

Concurrency vs Parallelism

Node.js has long excelled at concurrency. With the recent release of Node 13.0, Node now has a stable answer to parallelism as well. 

Concurrency can be thought of as switching between async processes, which all take turns executing, and, while idle, return control back to the event loop. On the other hand, parallelism is the ability for a process to separate and run simultaneously on multiple threads. There are other solutions in JavaScript that have tried to address this problem. For an in-depth comparison, I found this article useful.