IBM Tivoli Composite Application Manager for Application Diagnostics, Version 7.1.0.1

Garbage Collection Analysis attributes

The Garbage Collection Analysis attribute group provides information about the garbage collector in the Java Virtual Machine that is hosting the application server.

The garbage collection attributes report the number of times the collector ran during the interval and the resulting number of objects that the collector freed. Use the Garbage Collection Analysis attributes in situations to monitor garbage-collection performance and possible problems. The attributes within this group are used to build the Garbage Collection Analysis and the WAS workspaces.

ASID

The identifier (decimal) assigned to the address space running this servant region.

GC Rate (per min)

The rate (per minute) at which the Java Virtual Machine is invoking its garbage-collection routine. Format is decimal (formatted to 3 decimal places).

Heap Used (%)

The percentage of heap used at the end of the interval. Format is decimal (formatted to 1 decimal places).

Interval (sec)

The length (in seconds) of the sampling interval. Format is positive integer.

Kbytes Free

The total number of free kilobytes in the heap at the end of the last garbage-collection cycle during the interval. Format is positive integer.

Kbytes Total Freed by GC

The total number of kilobytes freed by the garbage collector during the interval. Format is positive integer.

Kbytes Used

The number of kilobytes in the heap that were in use at the end of the last garbage collection cycle during the interval. Format is positive integer.

Kbytes Used Delta

The difference between the Kbytes Used

value for this interval and the Kbytes Used value for the prior interval. Format is positive or negative integer.

Node Name

The name of the system on which the server is running. Alphanumeric string.

Objects Freed

The number of objects the garbage collector freed during the interval (only supported for IBM JDK). Format is positive integer. Not monitored on non-IBM Java Virtual Machines, including those commonly used on HP-UX and Solaris platforms.

Objects Moved

The number of objects the garbage collector moved during the interval (only supported for IBM JDK). Format is positive integer. Not monitored on non-IBM Java Virtual Machines, including those commonly used on HP-UX and Solaris platforms.

Origin Node

The name of the server subnode. Alphanumeric string. Maximum 128 characters.

Process ID

The unique identifier of the JVM process (the class ID of the JVM). Format is positive integer.

Real Time (ms)

The total real time (in milliseconds) the garbage collector required during the most recent cycle. Format is positive integer.

Real Time (%)

The percentage of real time that the garbage collector was active during the interval. Format is decimal (formatted to 1 decimal place).

Sample Date and Time

The date and time the Tivoli Enterprise Management Agent collected the data. The valid format is a 12-character timestamp. For the STR and SCAN functions, the format is MM/DD/YY HH:MM:SS; the following table shows the values contained in this character string:


Format of the 12-character timestamp

Character String Meaning
MM Month
DD Day
YY Year
HH Hour
MM Minute
SS Second

Example: 09/13/06 18:32:03 indicates the data was collected on September 13, 2006, at 18:32:03.

This attribute was designed for logging and reporting data-collection times rather than for creating situations. To specify a time and date for comparison and testing, use attributes from the Universal Time or Local Time groups.

Server Name

The name of the WebSphere application server. Alphanumeric string.

Summary

Indicates that this row is a summary row of statistical totals for all rows.

Times Run

The number of times the garbage collector ran during the interval. Format is positive integer.

Additional information:


Parent topic:

Attributes for ITCAM Agent for WebSphere Applications