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Tag Archives: Performance

Java8 Sorting – Performance Pitfall

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Java 8 brings all the goodness of lambdas to enable us to program using a declarative style. But is it really free? And should we be concerned about the price we have to pay for the new programming goodies? Here’s an example where we might have to worry. Consider sorting instances of this simple class:           ...

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First rule of performance optimisation

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Let’s start with a system with no obvious performance bottlenecks.  By that I mean that there are no glaring algorithmic problems which are grinding your system to a halt.  e.g. a tight loop which is reading a property from a file without caching the result. You want your system to run as fast as possible, where do you start?  Most ...

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Java performance tuning survey results (part IV)

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This is the last post in series where we analyze the results of the Java Performance Tuning Survey we conducted in October 2014. If you have not read the first posts, I recommend to go through the following first:                 Frequency and severity of performance problems Most popular monitoring solutions Tools and techniques ...

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Java performance tuning survey results (part III)

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This is the third post in a series where we analyze the results of a survey conducted in October 2014. If you have not already done so, I recommend to start with the first two posts in the series: problem severity analysis and monitoring domain analysis. This post focuses on troubleshooting / root cause detection. The background to this survey ...

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Java performance tuning survey results (part II)

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This is a second post in series where we analyze the results of the performance tuning survey conducted in October 2014. If you have not read the first part yet, we recommend to start here. Second part will focus on monitoring Java applications for performance issues. In particular, we try to answer the following questions:           ...

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Java performance tuning survey results (part I)

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We conducted a Java performance tuning survey during October 2014. The main goal of the survey was to gathering insight into Java performance world to improve the Plumbr product offering. However, we are happy to share the interesting results with you as well. The data that we collected provided material for a lengthy analysis, so we decided to divide the results ...

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Compounding double error

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Overview In a previous article, I outlined why BigDecimal is not the answer most of the time. While it is possible to construct situations where double produces an error, it is also just as easy to construct situations were BigDecimal get an error. BigDecimal is easier to get right, but easier to get wrong. The anecdotal evidence is that junior ...

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Top 5 Java Performance Tuning Books – Best of Lot, Must read

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Why Java developer should read a book on Performance tuning? When I first faced this question long time back, I thought I will do it later, but I never get back to that for a long time. I realize my mistake of having lack of knowledge on performance measurement, tuning and finding bottleneck only when I faced serious performance and ...

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Locking and Logging

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Plumbr has been known as the tool to tackle memory leaks. As little as two months ago we released GC optimization features. But we have not been sitting idle after this – for months we have been working on lock contention detection. From the test runs we have discovered many awkward concurrency issues in hundreds of different applications. Many of ...

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Performance Tuning of Spring/Hibernate Applications

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For most typical Spring/Hibernate enterprise applications, the application performance depends almost entirely on the performance of it’s persistence layer. This post will go over how to confirm that we are in presence of a ‘database-bound’ application, and then walk through 7 frequently used ‘quick-win’ tips that can help improve application performance. How to confirm that an application is ‘database-bound’ To ...

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