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

Michael Kopp

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Top Stories by Michael Kopp

In a recent article we have shown how the Java Garbage Collection MXBean Counters have changed for the Concurrent Mark-and-Sweep Collector. It now reports all GC runs instead of just major collections. That prompted me to think about what a major GC actually is or what it should be. It is actually quite hard to find any definition of major and minor GCs. This well-known Java Memory Management Whitepaper only mentions  in passing that a full collection is sometimes referred to as major collection. Stop-the-world One of the more popular definitions is that a major GC is a stop-the-world event. While that is true, the reverse is not. It is often forgotten that every single GC, even a minor one, is a stop-the-world event. Young Generation collections are only fast if there is a high mortality rate among young objects. That’s because they copy the few surviving objects an... (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)

Cloud Computing: Cloud Expo in NYC is Coming!

Another year and another Cloud Expo in New York. This year I will be giving two different presentations. The first is on Application Performance Monitoring in the Clouds. In this talk I will cover the five top lessons we have learned about performance and cloud applications. The second is about Performance Management in ‘Big Data' Applications. Most articles that I found on performance and Big Data are about the performance options on the Big Data product itself, but tend to be pretty light on the application itself. In this talk I will cover the two sides of BigData (Hadoop Ma... (more)

Deep Insight and Collaboration in the Cloud: A Customer Story

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 serv... (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)