Home » Author Archives: Art Gourevitch

Author Archives: Art Gourevitch

Tracking excessive garbage collection in Hotspot JVM


Quite frequently due to memory leaks or other memory problems applications freeze leaving only the garbage collector (GC) process running unsuccessfully trying to free some space. This happens until watchdog (or frustrated administrator) restarts the application and the problem is never solved. The goal of this article is to show how to identify excessive GC and to get a heap ...

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Introduction to BTrace for Java applications


The aim of this article is to learn how to dynamically trace/observe running Java applications (JDK 6+) using BTrace without changing the code and configuration params of the applications. What is BTrace? BTrace is an open source project that was started in 2007 and was originally owned by two people – A.Sundararajan and K. Balasubramanian. It gained fame thanks to ...

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Just in Time Compiler (JIT) in Hotspot


The Just In Time Compiler (JIT) concept and more generally adaptive optimization is well known concept in many languages besides Java (.Net, Lua, JRuby). In order to explain what is JIT Compiler I want to start with a definition of compiler concept. According to wikipedia compiler is ‘ a computer program that transforms the source language into another computer language ...

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