Where to find mat in eclipse

After reviewing all the documentation, and even an online video, I cannot figure how to even start MAT. There is nothing in Eclipse menus or toolbars, and no executable anywhere that I could start directly. Sorry if this sounds like a newbie question, but sorry, it isn't. Re: How to start MAT [ message is a reply to message ]. Wed, 02 January In such circumstances local variables will be still alive in memory, occupying space.

Since Eclipse MAT default settings don't show the unreachable objects, you will not get visibility into these objects. You can change the default settings in Eclipse MAT 1.

Fig: Eclipse MAT 1. Eclipse MAT by default displays data in bytes. It's difficult to read large object sizes in bytes and digest them. Example Eclipse MAT prints object size like this: ',, Fig: Eclipse MAT default option showing object size in bytes. It can be enabled by following the below steps:.

Asked 8 years, 4 months ago. Active 4 years, 3 months ago. Viewed 46k times. Feel stupid, sorry ;- What is the steps exactly? Have tried both - nothing seem to work right now. Many thanks for a description Improve this question. Add a comment. Active Oldest Votes. Improve this answer. Just FYI The latest released version 1. Good explanation. This is because one of the list was declared static. You can also explore all the incoming and outgoing references to an Object. This is very useful if you want to see all the references to a particular Object in the Object graph.

The Inspector provides detailed information about the currently selected Class or Object. In this example we can see that the currently selected ArrayList contains , elements and references an object array at memory location 0x7fea Keeping the Inspector and the Snapshot linked will provide you with important statistics about all your selections.

The MAT provides reports for common memory use anti-patterns. These can be used to get an idea of where memory leaks are occurring, or by looking for some low hanging fruit which can be cleaned up to help improve performance. The Heap Dump Overview will show you detailed information about your Heap Dump and provide links to common tools like the Histogram.

Information such as the threads which were running, total number of Objects in the system, size of the heap, and are also shown. The Leak Suspects report displays possible memory leaks, and provides links to the tools and charts to analyze these findings.

Another common anti-pattern is the use of a large number of collections, with very few entries in each one. For example, if our listeners each had an array of notifiers items that need to be notified of certain events , but these notifiers were only used occasionally, we would end up wasting a lot of space. The Java Collections tools can help with these problems. If were allocated these in a lazy manner only when needed , we would save almost 8Mb. We can also use Collection Analysis to see array fill ratios , collection size statistics and map collision ratios.

The MAT has a number of built in tools to generate reports tailored to the details of the Java runtime. For example, the Threads and Stacks report will show details about all the treads in the system.

You can see the local variables which are currently kept alive on each stack.