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Hot Classes Table

Similar to hot packages, hot classes are those classes wherein the application spends a significant amount of time executing. This table provides a more granular view of where the application is spending time executing than does the Hot Packages Chart, making it valuable in helping you recognize which classes might be problematic. Table: Hot Classes Table Description describes the columns on this table.

Hot Classes Table Description

Column Description

Class

Name of the hot class.

Sample Count

The number of times, within the period specified on the range navigator, that the class was sampled.

Percentage

The percentage of the total time, within the period specified on the range navigator, that the application spends executing in the specific class.


Filtering Information

You can use the filtering mechanism above the table to narrow the information shown in a table.

To filter a column:

  1. Right-click the Filter Column drop-down control to open its menu and select the column you want to filter on, for example Class.

    The column name appears in the Filter Column field.

  2. In the adjacent text box, enter the string for which you want to filter.

    Normally, to lessen the impact on performance, matching is done using only simple Kleene star wildcards. A star (*) will match zero or more occurrences of anything; for example:

    8* will match anything beginning with 8. *es will match anything ending with es.

    You can also match using regular expressions; however, resolution can take much longer with complex expressions and large amounts of data; for example:

    regexp:(YC|Young Collect).* will match anything starting with YC or Young Collect, such as YC Promotion Failed, Young Collection and Young Collector Nursery Snapshot. .

    You can also build logical expressions for columns with numerical values. For instance, for a column with counts, such as the one in Memory/allocation Allocation by Class table, the expression > 100 && < 500 will filter out the classes with more than 100 but less than 500 events.

    The filter text entry field is case sensitive.

Customizing the Table

You can customize the Hot Classes table by using the context menu to do the following: