HPjmeter 4.3 User's Guide

• Mark an Item for Search (page 203)

• Find a Search Pattern (page 204)

Exclusive Class Clock Times*

The total of the Exclusive Method Times (Clock), summed over all methods of the class. To see the

list of all contributing methods, double click on the class name. The standard methods

java.lang.Thread.sleep and java.lang.Object.wait do not contribute to this metric, however, they

will be shown on the list of all contributing methods for the respective classes.

Related Topics

• Inclusive Versus Exclusive Time (page 82)

• Time Units (page 82)

• Mark an Item for Search (page 203)

• Find a Search Pattern (page 204)

Profile Memory and/or Heap Activity

Most of the heap metrics are available only when analyzing a heap dump file. When using the

hprof tool to generate a heap dump, use the profiling option -agentlib:hprof=heap=all.

See the metrics table to check how to collect the profile data in order to obtain a specific metric.

The types of objects allocated on heap are classes and arrays. If the profile data file does not

contain the specific information related to objects, HPjmeter estimates Objects Created by Method

and Created Objects (Count) based on the number of class constructors called. In such cases, you

will see "(data estimated)" next to the metric label.

The estimation entirely misses the arrays, and may report inaccurate numbers. Some of the calls

to constructors may remain unprofiled, or be not recognized as such by HPjmeter. It is also possible

to err on the plus side, when HPjmeter does not properly recognize the class hierarchy.

These metrics – Reference Graph Tree, Reference Sub-tree by Size, Residual Objects (Count), and

Residual Objects (Bytes) – show the residual objects. These are objects remaining on the heap at

the time the profile data file is written.

Objects Created by Method

Number of objects of all types created by each method. Double click on the method name to see

the distribution of the number over object types.