A tool that parses verbose GC trace, analyzes Java heap usage, and recommends key configurations based on pattern modeling of Java heap usage.
Tutorial Details:
IBM Pattern Modeling and Analysis Tool for Java Garbage Collector (PMAT) parses verbose GC trace, analyzes Java heap usage, and recommends key configurations based on pattern modeling of Java heap usage.
When the JVM cannot allocate an object from the current heap because of lack of space, a memory allocation fault occurs, and the Garbage Collector is invoked. The first task of the Garbage Collector is to collect all the garbage that is in the heap. This process starts when any thread calls the Garbage Collector either indirectly as a result of allocation failure or directly by a specific call to System.gc().
How does it work?
PMAT analyzes verbose GC traces by parsing the traces and building pattern models. PMAT recommends key configurations by executing a diagnosis engine and pattern modeling algorithm. If there are any errors related with Java heap exhaustion or fragmentation in the verbose GC trace, PMAT can diagnose the root cause of failures. PMAT provides rich chart features that graphically display Java heap usage. The following features are included:
* GC analysis
* GC table view
* Allocation failure summary
* GC usage summary
* GC duration summary
* GC graph view
* GC pattern analysis
* Zoom in/out/selection/center of chart view
* Option of changing chart color.
Garbage Collection in the Java HotSpot Virtual Machine
Garbage Collection in the Java HotSpot Virtual Machine
Gain a better understanding of how garbage collection in the Java HotSpot VM works, and learn to take full advantage of it when designing, developing, and deploying your Java applications.
Core Java Interview Questions!
Core Java Interview Questions!
Core Java Interview Questions
Question: What is transient variable?
Answer: Transient variable can't be serialize. For example if a variable is declared as transient in a Serializable class and the class is written
Which Java VM scales best? - JavaWorld - August
1998