Port Bonding When using a passive or active LAN tap and not an “aggregator” or “mirror port” for monitoring network traffic, both the ‘incoming’ and ‘outgoing’ channels need to be bonded together for IDS sys... read more
Introduction For proper cluster functionality, all nodes in the cluster need to have their clocks synchronized, even when the cluster is isolated from the Internet and global time sync servers. To accomplish this, we installed NTP on Ubuntu/Linux and conf... read more
This short How-To post is a companion post to How to Install a Distributed Apache Storm Cluster, and shows how to debug an Apache Zookeeper installation. The debugging methods presented below include starting Zookeeper manually, pinging the Zookeeper serv... read more
Introduction This document will help you get up and running with your own development environment compatible with Knowm’s development stack. There’s a bit of a learning curve, but we’ve taken measures to make collaborating as easy as pos... read more
Running Apache Storm cluster on EC2 is greatly simplified with the open source project storm-deploy-alternative. With this handy project, you can define your Storm cluster in a simple configuration file and create the running instances as well as installi... read more
For many applications such as real-time stock prediction algorithms or brain simulations, there is a need for extremely fast and massively parallel computing. My friend, Alex Nugent, and I needed some enormous computational power for some projects we are ... read more
When creating graphical user interfaces with Java, it is often useful to add charts to your Java application for visualizing data. In this tutorial, we show how to easily add charts to a Java Swing application using our open source Java charting library X... read more
In 2009, Biolek et al. published a paper showing an idealized memristor model for a newly publicized memristor created at HP labs. The paper can be downloaded here. The model is referred to in a fews ways: “The Ideal Memristor”, “The non... read more
In 2013, Pershin et al. published a paper showing an idealized memristor model for a device that changes it’s conductance as a function of the applied voltage. The paper can be downloaded here. This blog post is about taking the model from the paper... read more
Xyce is a new (relative to the original SPICE) circuit simulator from Sandia National Laboratories that is SPICE-compatible but operates in a fundamentally different way under the hood. Xyce boasts a modern code base, an active forum, supports large-scale... read more