## VM Telemetry Window

See Also

The VM Telemetry window displays high-level data on thread activity and memory heap and garbage collection in the VM. The VM Telemetry window typically opens in the editor area.

You open the VM Telemetry window by choosing Window > Profiling > VM Telemetry from the main menu. Alternatively, you can click VM Telemetry ( ) in the Profiler window.

The toolbar of the Threads window contains the following items:

Button | Function
--- | ---
| Save Current View.Click this to increase the detail of the graph.
| Zoom In.Click this to increase the detail of the graph.
| Zoom Out. Click this to decreases the detail of the graph.
| Scale-to-Fit. Click this to modify the display of data so that the entire graph fits in the window.

The VM Telemetry window contains three tabs with graphs displaying data on the following processes:

- Threads (Statistics). The Threads graph displays the total number of threads in the profiled application JVM. You can place your cursor over the graph to display a tooltip with information about the current and maximum number of threads.
- Memory (Heap). The Memory (Heap) graph displays the total and used size. These are the figures that a Java application can obtain using the `java.lang.Runtime.totalMemory()` and `java.lang.Runtime.freeMemory()` calls. You can place your cursor over the graph to view more detailed information about memory usage at that point in time.
- Memory (GC). The Memory (GC) graph displays the relative time spent in garbage collection and the number of surviving generations.You can place your cursor over the graph to view more detailed information about garbage collection statistics at that point in time.

See Also
  Profiling Windows

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