List/Grid Tag Archives: JVM

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VisualVM: Monitoring Remote JVM Over SSH (JMX Or Not)

VisualVM is a great tool for monitoring JVM (5.0+) regarding memory usage, threads, GC, MBeans etc. Let’s see how to use it over SSH to monitor (or even profile, using its sampler) ...
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OutOfMemoryError: unable to create new native thread – Problem Demystified

As you may have seen from my previous tutorials and case studies , Java Heap Space OutOfMemoryError problems ...
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Java Memory Profiling Simplified

As a typical Java developer I never monitored the memory usage of my application apart from following typical best practices like closing the connections, streams etc.. Recently we ...
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BTrace: hidden gem in Java developer toolbox

This post is about BTrace which I am considering as a hidden gem for Java developer. BTrace is a safe, dynamic tracing tool for the Java platform. ...
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Which Java thread consumes my CPU?

What do you do when your Java application consumes 100% of the CPU? Turns out you can easily find the problematic thread(s) using built-in UNIX and JDK tools. No profilers or agents ...
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8 Ways to improve your Java EE Production Support skills

Everybody involved in Java EE production support know this job can be difficult; 7/24 pager support, multiple incidents and bug fixes to deal with on a regular basis, pressure from ...
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Java Thread at RUNNABLE state is not really running

Recently, I was doing an analysis/tuning on a Java application server installation in order to identify the bottlenecks and fix them. The most common action in such procedure (tuning) ...
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Memory Access Patterns Are Important

In high-performance computing it is often said that the cost of a cache-miss is the largest performance penalty for an algorithm. For many years the increase in speed of our processors ...
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Oracle Service Bus – Stuck Thread Case Study

This case study describes the complete root cause analysis process of a stuck thread problem experienced with Oracle Service Bus 11g running on AIX 6.1 and IBM Java VM ...
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5 tips for proper Java Heap size

Determination of proper Java Heap size for a production system is not a straightforward exercise. In my Java EE enterprise experience, I have seen multiple performance problem cases ...
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