Welcome!

In the Cloud, you have to trust your instruments...

Michael Kopp

Subscribe to Michael Kopp: eMailAlertsEmail Alerts
Get Michael Kopp via: homepageHomepage mobileMobile rssRSS facebookFacebook twitterTwitter linkedinLinkedIn


Top Stories by Michael Kopp

Recently, one of our customers, let's call him PointInFact, had a very typical problem. After deploying a new version of its software, some user requests degraded horribly. Requests that should have taken half a second took up to a minute. Interestingly, the PointInFact team runs a multi-tenant SaaS solution in the AWS Cloud and relies heavily on cloud services. This reliance makes User Experience Management and fault domain isolation very challenging. Back Story: Application Running in the AWS Cloud PointInFact runs a SaaS service. Internally this results in a multi-tenant service where each customer has his own instance of the application he subscribes to. All of these applications and services are hosted in Amazon's EC2 Cloud where they dynamically create new application environments and offload some functionality to AWS by using the provided services. As a SaaS ... (more)

Troubleshooting Response Time Problems

Production Monitoring is about ensuring the stability and health of our system, that also includes the application. A lot of times we encounter production systems that concentrate on System Monitoring, under the assumption that a stable system leads to stable and healthy applications. So let’s see what System Monitoring can tell us about our Application. Let’s take a very simple two-tier Web Application: A simple two tier web application This is a simple multi-tier eCommerce solution. Users are concerned about bad performance when they do a search. Let's see what we can find out a... (more)

How Garbage Collection Differs in the Three Big JVMs

(Note: If you’re interested in WebSphere in a production environment, check out Michael's upcoming webinar with The Bon-Ton Stores) Most articles about Garbage Collection ignore the fact that the Sun Hotspot JVM is not the only game in town. In fact whenever you have to work with either IBM WebSphere or Oracle WebLogic you will run on a different runtime. While the concept of Garbage Collection is the same, the implementation is not and neither are the default settings or how to tune it. This often leads to unexpected problems when running the first load tests or in the worst case... (more)

Why Perfomance Management Is Easier in Public than On-Premise Clouds

Performance is one of the major concerns in the cloud. But the question should not really be whether or not the cloud performs, but whether the Application in question can and does perform in the cloud. The main problem here is that application performance is either not managed at all or managed incorrectly and therefore this question often remains unanswered. Now granted, performance management in cloud environments is harder than in physical ones, but it can be argued that it is easier in public clouds than in on-premise clouds or even a large virtualized environment. How do I ... (more)

How to Identify a MongoDB Performance Anti Pattern in Five Minutes

The other day I was looking at a web application that was using MongoDB as its central database. We were analyzing the application for potential performance problems and inside five minutes I detected what I must consider to be a MongoDB anti pattern and had a 40% impact on response time. The funny thing: It was a Java best practice that triggered it. Analyzing the Application The first thing I always do is look at the topology of an application to get a feel for it. Overall Transaction Flow of the Application As we see it's a modestly complex web application and it's using Mongo... (more)