Tag Archives: jvm

Analyzing the “ecological footprint” of java algorithms

Posted on August 24, 2014 by axtaxt

When trying to optimize algorithms implemented in java, not just cputime, and memory footprint are important, but often we are interested in the amount of generated garbage. If your service is bounded by some availability agreements having a deep knowledge … Continue reading →

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IO trace generation in java: experimenting with sun.misc.IoTrace

Posted on September 19, 2013 by axtaxt

I’ve recently checked the new features in the latest release (1.7.0_40) of Oracle’s Java SE, when I stumbled upon a new class, sun.misc.IoTrace. The source of sun.misc.IoTrace can be viewed here. Its basically and “empty” class, which does nothing, and … Continue reading →

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Analysis of CVE-2013-0809

Posted on July 6, 2013 by axtaxt

This post is about the analysis of CVE-2013-0809, a java security bug I’ve found. As it is common for java bugs, the most relevant information can be found in RedHat’s CVE database and in RedHat’s bugzilla. In this case it … Continue reading →

Posted in Bugs, Security | Tagged , , , , , | 4 Comments

Debugging Java VM’s JITed code

Posted on April 22, 2012 by axtaxt

Recently I’ve run into some misterious Java VM crashes. After narrowing down the crashing code, I’ve ended up with this POC: It must be run with -XX:CompileThreshold=100 VM option, to enable the JIT compiler to do it’s work “early”. With … Continue reading →

Posted in Bugs | Tagged , , , , , , | 2 Comments