HP Jmeter is a powerful tool to do Garbage Collection Analysis. Even though there are few Garbage collection analysis tool Continue reading “HP Jmeter – GC Analysis Tool”
HP Jmeter – GC Analysis Tool
Understanding Garbage Collection Log
To diagnose any memory problems, Garbage Collection log file is the best place to start. It provides several interesting statistics: Continue reading “Understanding Garbage Collection Log”
CPU maxes out and utilization never goes down?
Continue reading “CPU maxes out and utilization never goes down?”This is an old, outdated article. We have devised a better and simpler strategy to troubleshoot CPU spikes in this article.
How to capture Thread dump? – jstack, jvisualvm
Thread dump is a snapshot of all the threads that were executing at a moment in time. It shows the stack trace of each thread Continue reading “How to capture Thread dump? – jstack, jvisualvm”
How to capture heap dump? – jmap, -XX:+HeapDumpOnOutOfMemoryError
Heap dump is a snapshot of the Java memory. It contains information about the Java objects and classes in the heap at the moment Continue reading “How to capture heap dump? – jmap, -XX:+HeapDumpOnOutOfMemoryError”
Yes, you can catch Memory Leaks during test
Memory leaks are dangerous problems which puts entire application’s availability in to question mark. Most of the time Continue reading “Yes, you can catch Memory Leaks during test”
Often dismissed silly things – System.out.println and e.printStackTrace
Java developers have affinity to use System.out.println and e.printStackTrace during the development phase. Continue reading “Often dismissed silly things – System.out.println and e.printStackTrace”
Memory Leak in Java Executor!
I was surprised to witness the Java Executor behavior – which caused Continue reading “Memory Leak in Java Executor!”
Spring IOC Container – Performance Problem
Spring IOC Container wires the dependencies among the beans and returns the fully built bean tree to the caller. Continue reading “Spring IOC Container – Performance Problem”
Thread Dump Analysis Pattern – THREAD MILL
Description
You might have experienced the application’s CPU to spike up suddenly & spike wouldn’t go down until JVM is recycled. Continue reading “Thread Dump Analysis Pattern – THREAD MILL”
Thread Dump Analysis Pattern – Traffic Jam
Description
Thread-A could have acquired the lock-1 and then would never release it. Thread-B could have acquired lock-2 Continue reading “Thread Dump Analysis Pattern – Traffic Jam”
THREAD DUMP ANALYSIS PATTERN – Several Scavengers
Description
Based on the type of GC algorithm (Serial, parallel, G1, CMS) used, default number of garbage collection threads Continue reading “THREAD DUMP ANALYSIS PATTERN – Several Scavengers”
Circular Deadlock
Description
Dinning Philosophers is a classic computer science problem that happens in concurrent programming. Continue reading “Circular Deadlock”
Deadlock
Description
Wikipedia aptly defines deadlock is a situation in which two or more competing actions are each waiting Continue reading “Deadlock”
THREAD DUMP ANALYSIS PATTERN – LEPRECHAUN TRAP
Description
Unlike other objects, GC process will not immediately garbage collect the objects which has finalize method implemented Continue reading “THREAD DUMP ANALYSIS PATTERN – LEPRECHAUN TRAP”
Spring HTTP Remoting – pass custom HTTP header elements
If you are using Spring HTTP Remoting to communicate between your applications, sometimes you might want to Continue reading “Spring HTTP Remoting – pass custom HTTP header elements”
THREAD DUMP ANALYSIS PATTERN – STOCK TICKER
Description
In thread dump analysis, one of the key parameter to watch out is: Thread Count. You need to know the application’s thread count Continue reading “THREAD DUMP ANALYSIS PATTERN – STOCK TICKER”
THREAD DUMP ANALYSIS PATTERN – ADDITIVES
Description
It’s highly recommended to capture 3 threads dumps in an interval of 10 seconds to uncover any problem in the JVM. Continue reading “THREAD DUMP ANALYSIS PATTERN – ADDITIVES”
THREAD DUMP ANALYSIS PATTERN – REPETITIVE STRAIN INJURY (RSI)
Description
Whenever significant number of threads exhibit same/repetitive stack trace then those stack trace has to be investigated. Continue reading “THREAD DUMP ANALYSIS PATTERN – REPETITIVE STRAIN INJURY (RSI)”
THREAD DUMP ANALYSIS PATTERN – ALL ROADS LEAD TO ROME
Description
If several threads in a thread dump ends up working on one single method, then it might be of concern. Most of the times Continue reading “THREAD DUMP ANALYSIS PATTERN – ALL ROADS LEAD TO ROME”
tier1app 