Distilling Dumps: a Guide to Using and Extending Memory Analyzer
- 1. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov (SAP) Andrew Johnson (IBM)
- 2. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 2 Memory Analyzer overview Works with heap dumps – post-mortem analysis UI and programmatic access to data in the heap dumps Automatic problem recognition Extendable
- 3. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 3 Demo Introduction to Memory Analyzer
- 4. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 4 Introduction to extending MAT Why extend MAT? To save time doing the same thing repeatedly To help others use the same technique as you To do things not possible from the GUI To build in application specific logic Examples Eclipse bundle explorer – shown as a tree (provided with MAT) JRuby (recent contribution to MAT) How to extend MAT MAT provides a set of Eclipse extension points User writes an extension plug-in MAT provides an API for reading the data from a dump
- 5. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 6 Name Resolver Used to give meaningful descriptions of objects Text result (similar to a toString()) Useful for 'Group by Value' query Extension point: org.eclipse.mat.nameResolver
- 6. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 7 Implement a Name Resolver
- 7. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 8 Query Used for exploring dumps or detailed analysis May interact with existing queries (context menus) Integrated into MAT’s menus Extension point: org.eclipse.mat.api.query
- 8. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 9 Implement a Query
- 9. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 12 Results from a Query IResult ObjectList(atree) ListResul(atable) Compositionofresults inHTML Histogr(atable)
- 10. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 13 Using a Predefined Result
- 11. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 20 Request Resolver Used to identify what a thread was doing Appears in the leak suspects report Extension point - org.eclipse.mat.api.requestResolver
- 12. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 21 Implement a Request Resolver
- 13. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 22 Other extension points Reports - org.eclipse.mat.report.report HTML results of queries – also used for batch mode Thread resolver – additional thread data such as native stacks Ticket resolver – can identify appropriate routing for problem Based on classes and classloaders of problem objects Rendering – org.eclipse.mat.api.renderer Additional to HTML and CSV Trigger heap dump – org.eclipse.mat.api.heapDumpProvider For new VM types Parser – for new dump types and VMs, such as for Jikes RVM Snapshot factory – org.eclipse.mat.api.factory Unlikely to use this as replaces whole snapshot
- 14. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 23 In Summary, MAT Offers … Helpful memory analysis features out-of-the-box API for extracting data Application specific analysis can be added as extensions
- 15. Distilling Heap Dumps: a Guide to Using and Extending Memory Analyzer Krum Tsvetkov, Andrew Johnson 24 Thank You! Memory Analyzer @ Eclipse: http://www.eclipse.org/mat Wiki page for extending Memory Analyzer: http://wiki.eclipse.org/MemoryAnalyzer/Extending_Memory_Analyzer Forum: http://www.eclipse.org/forums/eclipse.memory-analyzer Blogs: http://dev.eclipse.org/blogs/memoryanalyzer