Sample Points

See Also

Sample points provide global information about the process, and can be used to obtain an overview of the execution of the program. Each packet of data contains a high-resolution time stamp and global timing information, but has no information that is event-specific or related to the program structure. The overhead for recording sample points is very low. The process of recording sample points is called sampling.

Sample points can be used to divide a run of your program into pieces called samples that can be viewed separately in the Performance Analyzer. Each sample point marks the end of one sample and the beginning of the next. The Performance Analyzer does not distinguish between samples recorded under different circumstances as outlined below, so you might want to use only one of the sampling modes at a time.

Sample points can be recorded periodically, by user intervention or by calls to the Collector API routines. Sample points are also recorded by dbx whenever it stops your program, and by the Collector at the beginning and the end of the experiment.

You can control the recording of sample points in the following ways:

See also
Collecting Performance Data

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