Home » Tag Archives: JVM (page 3)

Tag Archives: JVM

cjmx: A command-line version of JConsole

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JConsole is a nice tool when it comes to monitoring a running Java application. But when it is not possible to connect to a JVM with JConsole directly (due to network restrictions for example) and SSH tunneling is not possible, then it would be great to have a command line version of JConsole. jcmx is such a command line version ...

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On heap vs off heap memory usage

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Overview I was recently asked about the benefits and wisdom of using off heap memory in Java. The answers may be of interest to others facing the same choices. Off heap memory is nothing special. The thread stacks, application code, NIO buffers are all off heap.  In fact in C and C++, you only have unmanaged memory as it does not have ...

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Self-healing JVM

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This post is an example about an application where the first solution to each and every IT problem – “have you tried turning it off and on again” – can backfire and do more harm than good. Instead of turning things off and on, we have an application that can literally heal itself: it fails at the beginning, but starts ...

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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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Revealing the length of Garbage Collection pauses

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There are several ways to improve your product. One such way is to carefully track what your users are experiencing and improve based on that. We do apply this technique ourselves and have again spent some time looking at different data Besides many other aspects we were after, we also posed a question “what is the worst-case effect for latency ...

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