Home > Profiling Results
Telemetry Tab
The VM Telemetry tab displays high-level data on thread activity and memory heap and garbage collection
in the VM.
To open the VM Telemetry tab, click the Telemetry Overview button in the Profiler window
while the application is being profiled.
The graphs display data on the following processes:
- Threads (Statistics)
Total
number of threads in the profiled application JVM. The tooltip over the
graph separates the number into "user" and "system" threads.
- Memory (Heap)
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.
- Memory (GC)
Relative time spent in
Garbage Collection and the number of surviving generations
The following buttons in the toolbar of the VM Telemetry tab enable you to modify
the view:
 | Zoom In Increases the detail of the graph |
 | Zoom Out Decreases the detail of the graph |
 | Scale-to-Fit Modifies the display of data so that the entire graph fits in the window |
You can select a region of the graph with your mouse to see that region in greater detail. Use the Zoom Out button to
decrease the detail.
If Enable Thread Monitoring was selected, the Threads (Timeline) and Threads
(Details) tabs also appear in the VM Telemetry tab.
See also
