HPjmeter 4.3 User's Guide

HPjmeter presents CPU utilization percentages as the number of CPUs x 100 to arrive at the total

possible percent of use. Therefore, maximum use of 3 CPU would be equal to or greater than

300% of 1 CPU out of a total of 4 available CPU. By applying this value (300%) for a 5–minute

duration in the Alert Controller, HPjmeter notifies you each time that value is exceeded for 5 minutes

during the monitoring session. A notification is generated for display on the console and recorded

in the alert log.

Conversely, if you expect that your application will always use at least 100% of 1 CPU, set the

operator at less than or equal to 100% to trigger a notification that the application is not consuming

resources as expected.

For more information, see also:

• Set Session Preferences (page 37)

• Using Alerts (page 121)

• Percent (%) CPU Utilization (page 158)

• Identifying Unexpected CPU Usage by Method (page 49)

Thread Deadlock Alert

By default, this alert is activated when two or more threads are attempting to acquire Java locks

that have been acquired already by a set of threads.

Double-click the alert to display the thread histogram window. This allows you to determine which

threads are deadlocked.

Deadlocked threads represent a multi-threaded program error.

An application experiencing a deadlock may not crash, but it is unresponsive to requests.

If the alert persists, it suggests a problem in the application logic that will need to be addressed

by developers.