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Educational – Best Practises

WebLogic thread – STUCK, ACTIVE, STANDBY

Oracle Fusion Middleware, Oracle Enterprise Manager, and several other technologies internally uses WebLogic application server. In a WebLogic server, all incoming requests are handled by execute threads in the thread pool. Based on the activity of these threads, WebLogic server... Continue Reading →

BENEFITS OF CALL STACK TREE

Call Stack Tree provides 3 wonderful benefits: 1. One simplified view 2. Performance Optimization 3. Accurate Smoke Test Let's discuss them in detail in this article. 1. One simplified view Thread dumps are the snapshot of all threads running in... Continue Reading →

HOW TO IDENTIFY CRITICAL CODE PATH?

Before answering the question 'How to identify critical code path?’ let me answer 'Why identify critical code path?’ Why identify critical code path? There are a couple of answers to it: Performance OptimizationAccurate Smoke Test Performance Optimization  In most applications,... Continue Reading →

WORD/POWERPOINT/EXCEL OR GC/THREAD/HEAP DUMPS

If you want to learn about the architecture of the application, performance characteristics of the application, effectiveness of the engineering organization - lot of times (if not all the times), we will look at the Word documents, PowerPoint decks, Excel... Continue Reading →

HOW TO TROUBLESHOOT SUDDEN CPU SPIKES?

 This is an old, outdated article. We have devised a better and simpler strategy to troubleshoot CPU spikes in this article.  Have you ever experienced sudden CPU spikes for your applications in production? If your answer is Yes, then this... Continue Reading →

10 MICRO METRICS FOR YOUR PERFORMANCE REPORTS

In a lot of enterprises, performance tests are conducted regularly. As part of these tests, QA team gathers various metrics and publishes them in a performance report. Metrics reported in the performance report typically tend to be: CPU utilization Memory... Continue Reading →

LESS KNOWN FACTS ABOUT DAEMON AND NON-DAEMON THREADS

Non-daemon threads are also known as 'user' threads. JVM will not exit even if only 1 non-daemon (i.e. user) thread is alive. On the other hand, JVM will exit even if multiple daemon threads are alive. When JVM halts, daemon... Continue Reading →

WHAT’S THE DIFFERENCE BETWEEN BLOCKED, WAITING, AND TIMED_WAITING? – EXPLAINED TO REAL-LIFE EXAMPLES

BLOCKED, WAITING, and TIMED_WAITING are important thread states, but often confusing to many of us. One must have a proper understanding of both in order to analyze thread dumps. Using real-life examples, this article breaks down each state into simpler... Continue Reading →

TROUBLESHOOT OUTOFMEMORYERROR: UNABLE TO CREATE NEW NATIVE THREAD

There are 8 flavors of java.lang.OutOfMemoryError. In these 8 flavors java.lang.OutOfMemoryError: unable to create new native thread is one of the commonly occurring flavor. This type of 'OutOfMemoryError' is generated when an application isn’t able to create new threads. This error can surface... Continue Reading →

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