- System requirements
- Profiler architecture
- Running the profiler
- Profiler activation
- Start profiling
- Solving performance problems
- CPU profiling
- Threads
- Deadlock detector
- Memory profiling
- Memory telemetry
- Memory snapshot
- Object allocation recording
- Shallow and retained sizes
- Memory views
- Objects view
- Class list
- Class and package
- Class loaders
- Web applications
- Object generations
- Reachability scopes
- Shallow size
- Object explorer
- Biggest objects (dominators)
- Allocations
- Object ages
- Merged paths
- Class hierarchy
- Method merged callees view
- Method back traces view
- Quick info view
- GC roots view
- Leak detection: working with paths
- Memory inspections
- Comparing memory snapshots
- Support of HPROF format snapshots
- Support of Java Flight Recorder (JFR)
- Support of Portable Heap Dumps (.phd)
- Values of primitive types
- Persistent object IDs
- Useful actions
- Set description language
- Garbage collection
- Monitor profiling
- Exception profiling
- Probes: monitor events of various kinds
- Performance Charts
- Inspections: automatic recognition of typical problems
- Automatically trigger actions on event
- Summary, snapshot annotation, automatic deobfuscation
- Time measurement (CPU time, wall time)
- Filters
- Snapshot directory customization
- Export of profiling results to HTML, CSV, XML, plain text
- Profiler Java API
- Profiler HTTP API
- Command line tool to control profiling
- Settings
- FAQ: How to profile in my scenario?
Biggest objects (dominators)
This view shows individual objects that retain most of memory. The objects are shown as a dominator tree. That is, if object A retains object B, then object B will be nested in object A's node. Read more about retention.
This information can be useful to explore and reduce memory usage. In particular, it helps finding memory leaks caused by individual objects. Sometimes you can learn a lot by looking at memory distribution in terms of individual objects.
Also consider "Class list" which shows similar information for objects grouped by classes.