HPjmeter 4.3 User's Guide

For an explanation of Java memory terminology, see the Sun Developer Network publication
Memory Management in the Java HotSpot™ Virtual Machine
(http://java.sun.com/j2se/reference/whitepapers/memorymanagement_whitepaper.pdf)
Understanding the Summary Presentation of GC Data
To view the summary presentation of GC data, double-click on the data representation in the main
panel. A window will open to display the data.
The following image shows a summary of .vgc data collected using the -Xverbosegc option
and displayed under the Summary tab. Important aspects of the summary data are defined below
the image.
Figure 18 Summary Panel Showing Garbage Collection Statistics
Heap Capacity
Initial, final, and peak sizes allocated for various organizational spaces in the heap.
Peak Usage of Capacity
Basic Garbage Collection Concepts 105