Mat Compare Heap Dumps

With memory analyzer one can easily find the biggest objects as mat provides reasonable accumulated size retained size explore the object graph both inbound and outbound references.

Mat compare heap dumps. Heap dumps are usually stored in binary format hprof files. The project got integrated into the release train with helios and comes with great features. The eclipse memory analyzer tool mat is a fast and feature rich heap dump analyzer that helps you find memory leaks and analyze high memory consumption issues. It offers the possibility to compare the class histograms of two heap dumps or since 1 0 also the possibility to compare the retained sets of two or more objectct sets on class level.

Mat which stands for memory analyzer tool is a fast and feature rich java heap analyzer that helps you find memory leaks and reduce memory consumption. Also for eclipse users it s very common to use mat. In the next sections we ll go through multiple tools and approaches to generate a heap dump and we ll show the main differences between them. I m talking about the ability to acquire heap dump.

We can open and analyze these files using tools like jhat or jvisualvm. Memory analyzer just analyzes heap dumps and such questions about the objects dynamics are difficult to answer. Use the memory analyzer to analyze productive heap dumps with hundreds of millions of objects quickly calculate the retained sizes of objects see who is preventing the garbage collector from collecting objects run a report to automatically extract leak. A heap dump is a snapshot of the heap memory of a java process at a given time.

The eclipse memory analyzer is a fast and feature rich java heap analyzer that helps you find memory leaks and reduce memory consumption. This helps the developer to find memory leaks and high memory consumption issues. However like with many open tools if something is missing you re not locked in nor are you out of luck. The eclipse memory analyser tooling mat is a set of plug ins for the eclipse ide which provides tools to analyze heap dumps from java application and to identify memory problems in the application.

Open both heap dumps in mat open the histogram for the whichever heap dump demonstrates the anomalous behavior usually the one with the higher memory or thread usage. Compare to another heap dump this compares two histogram tables which list all the class names number of instances of that class and the total shallow heap. Eclipse memory analyzer tool mat is by far the best tool to analyze java heap dumps. A heap dump contains valuable information about the state of your system and the mat provides the tools needed to access this data.

The comparison just matches on class names and then shows the delta of the numeric values in each row between each table.