Truncated Experiments

This topic lists several circumstances in which an experiment is shorter than you might have expected, based on the time your program ran.

The program called exec

When a program that is collecting performance data makes a successful call to exec(2) or one of its variants, the Collector library is no longer loaded. The experiment is abnormally truncated, and no more data can be collected. If you want to continue to collect performance data on the descendant process, use the collect(1) command with the -F on option.

Hardware Counter Experiment Is Truncated

A hardware counter experiment can be terminated before the program finishes if cputrack(1) starts running. When cputrack starts, it takes control of the hardware counters from any program that is already using them. The Collector detects the loss of control of the hardware counters and closes the experiment.


Can't find what you are looking for? Submit your comments at http://www.sun.com/hwdocs/feedback.
Legal Notices