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Building a nirvana

What started out three years ago as in a form of a single ANT file has grown into literally a hundred of build tasks taking more than eight hours to complete from start to finish on sequential run. In this post we describe some of ...
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Migrating from javaagent to JVMTI: our experience

When you need to gather data from within the JVM, you will find yourself working dangerously close to the Java Virtual Machine internals. Luckily, there are ways you can avoid getting bogged down by JVM implementation details. The ...
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Allocating memory for the JVM: a case study

This post is about a recent performance tuning exercise. As always, these start with vague statements about symptoms. This time the devil took the form of “The application is slow and we do not have the access to source code. Wh ...
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Creating software for sysops – make sure you do not suck

Plumbr is all about detecting performance problems from within Java applications. Whether this application is residing in a desktop machine under developer’s desk or hidden in a production vault guarded by the Bastard Operator F ...
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OutOfMemoryError: solution antipatterns

Throughout those years we have kept a close eye on the problems packaged in different flavours of OutOfMemoryError message. Daily digests on new questions on specific keywords via specialised services such as the Google Alerts hav ...
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How to estimate memory consumption?

This story goes back at least a decade, when I was first approached by a PHB with a question “How big servers are we going to need to buy for our production deployment”. The new and shiny system we have been building was nine ...
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GC impact on throughput and latency

One type of the problems each and every Java application out there has to wrestle with is related to garbage collection. When the garbage collector works, it represents a wonderful invention. When it does not – or when the way G ...
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On Java Collection Waste

This article is about overhead posed by one of the most popular frameworks used – I bet there is close to no applications where the java.util.Collections is not used. The article is based on the fact that the framework provides ...
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Performance tuning – measure don’t guess

In my performance tuning career I have given the advice to measure and not guess more often than I can recall. And in many cases the target of this advice has given up after looking at the monolithic 500,000 LOC legacy application ...
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RMI enforcing Full GC to run hourly

During all the troubleshooting exercises I have carried out in my career, I have picked up a feeling that the bugs I am after are evolving and becoming meaner and uglier over time. Or maybe it is just my age kicking in. This parti ...
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