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Histogram Table

This Histogram table shows the textual representation of the distribution of event property data. It is comprised of two drop-down menus and a data table. On this table, you can view for a selected event property the data described in Table 6–35. This topic includes the following information:

Displaying Data for an Event Property

Select an event property from the Event Type and Group by combo-boxes to open a list of all available event properties. Table: Histogram Table Description describes the data that appears on the Histogram table.

Histogram Table Description

Column Description

Group by

The event property unit by which the associated data is grouped. The actual data type varies by event property; for example, if the event property is File Read - Bytes Read, this value will be an integer; if its Java Application / Java Sleep - Event Thread, it will be a thread name.

Total

The total amount of time, to the millisecond, that the associated grouping spent executing in the application.

Average

The average amount of time, to the millisecond, that the associated grouping spent executing in the application. This value is derived from dividing the value in Total by the Count.

Count

The total number of occurrences of the event property grouping.


Configuring the Histogram Table

In addition to viewing the indicated data, you can use the Histogram table context menu to:

  • Copy selected information for pasting elsewhere, for example in a text editor, and configure how that data is to be stored on your clipboard. See Copying Data to the Clipboard.

  • Add and remove threads from the operative set. See Using the Histogram Table with the Operative Set.

Using the Histogram Table with the Operative Set

On the Stack Traces Table, you can add or remove specific event properties from the operative set to compare just the events that occur in those traces. This functionality, accessible from the Operative Set context sub-menu, is similar to that available on other Flight Recorder tabs.

To show just traces in the operative set on the Stack Traces Table:

You can display on the Event Graph just those threads you have added to the operative set by selecting Show Only Operative Set, at the top left of the graph. When you select this checkbox, only those traces you have added to the operative set will appear on the Stack Traces Table. In addition, the Range Navigator will show the impact of the set on overall activity by changing the color of their representation as a portion of the overall events.