Class-wise statistical information output by the static field-based reference relationship output functionality

Output format

The output format of the class-wise statistical information output by the static field-based reference relationship output functionality is as follows:

Reference of class option-specified-class-name from static field
-------------------------------------------------------------^#¹
static field static-field-declaring-class-name^#².static-field-name^#²
 class-name(address)[area-name]
 class-name(address)[area-name]
 option-specified-class-name(address)[area-name]
------
...

#1:: The number of "-" (hyphens) that are output is equal to 37 added to the number of characters in option-specified-class-name.

#2:: Indicates the base of the reference relationship.

Output items

The following table describes the items shown in the output format.

Table 9-11 Output items (static field-based reference relationship output functionality)

Output items	Meaning
static-field-declaring-class-name	The class name declaring the static field that forms the base is output.
static-field-name	The name of the static field that forms the base is output.
class-name	The class name of the instance that references the instances of the classes specified in the -class option of the jheapprof command is output.
address	The address of the instance is output.
area-name	The area to which the instance belongs is output. Eden: Indicates the Eden area. Survivor: Indicates the Survivor area. Tenured: Indicates the Tenured area. Perm: Indicates the Permanent area. EM(eid=<id>): Indicates the Explicit memory block.
option-specified-class-name	The class name specified in the -class option of the jheapprof command is output.

This subsection gives an example output of the class-wise statistical information output by the static field-based reference relationship output functionality using the following source as an example:

import JP.co.Hitachi.soft.jvm.MemoryArea.*;
public class static_reference {
 public static void main(String args[]) {
 try {
 classA cls_a1 = new classA();
 classB cls_b1 = new classB();
 classB cls_b2 = new classB();
 classC cls_c1 = new classC();
 classC cls_c2 = new classC();
 classC cls_c3 = new classC();
 BasicExplicitMemory emem = new BasicExplicitMemory();
 classC cls_c4 = (classC)emem.newInstance(classC.class);
 cls_a1.s_cls_a = cls_a1;
 cls_a1.s_cls_b = cls_b1;
 cls_a1.s_cls_c = cls_c1;
 cls_a1.cls_b = cls_b2;
 cls_b1.cls_c = cls_c2;
 cls_b2.cls_c = cls_c3;
 cls_c1.cls_c = cls_c4;
 Thread.sleep(20000);
 } catch (Exception e) {e.printStackTrace();}
 }
}
class classA {
 static classA s_cls_a;
 static classB s_cls_b;
 static classC s_cls_c;
 classB cls_b;
}
class classB {
 classC cls_c;
}
class classC {
 classC cls_c;
 public classC(){
 }
}

The following figure shows the structure of the instances.

Figure 9-8 Structure of the instances (static field-based reference relationship output functionality)

[Figure]

The following figure shows the output result of the static field-based reference relationship output functionality. In this case, the jheapprof command is executed specifying the argument -class class-name -staticroot.

Figure 9-9 Output result (static field-based reference relationship output functionality)

[Figure]

9.6.3 Class-wise statistical information output by the static field-based reference relationship output functionality

(1) Output format and output items

Output format

Output items

(2) Examples of output