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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 ...
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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 ...
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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. ...
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Throughput and latency: performance tuning made simple

Many of our previous topics have measured the behaviour of certain systems in terms of either latency or throughput. As it can be confusing to understand what either of the term actually ...
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G1 vs CMS vs Parallel GC

This post is following up the experiment we ran exactly a year ago comparing the performance of different GC algorithms in real-life settings. We took the same experiment, expanded ...
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What Garbage Collector are you using?

Our research labs are humming at full speed. With the recent injection of capital, we can only warrant that the pace at which we keep innovating will only increase. Part of the research ...
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Would you dare to change HashMap implementation?

There are bold engineers working for the Oracle nowadays. I came to this conclusion when trying to nail down a Heisenbug yesterday. Not too surprisingly, the bug seemed to disappear ...
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How is ThreadLocal implemented?

This is a follow-up to my last week post, where I explained the motivation behind ThreadLocal usage. From the post we could recall that ThreadLocal is indeed a cool concept if you wish ...
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Running out of memory without the OutOfMemoryError

This is actually a reincarnation of a post originally posted in ~2010. The flashback occurred when listening to our engineers cursing at a particularly nasty bug raising its head yesterday. ...
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When and how to use a ThreadLocal

As our readers might already have guessed, I deal with memory leaks on a daily basis. A particular type of the OutOfMemoryError messages has recently started catching my attention – ...
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