Doing High-Resolution Profiling

Related Topics:

Choosing the Data to Collect

High-resolution profiles (those with a 1-millisecond profiling interval) record ten times as much data as normal profiles for any given run. For high-resolution profiling, the operating system must be running with a high-resolution clock routine.

To specify a high-resolution routine:

1. Add the line set hires_tick=1 to the file /etc/system.

2. Reboot your system.
Caution - If you try to set high-resolution profiling on a machine whose operating system does not support it, the Sampling Collector posts an error message and reverts to the highest resolution supported.
Caution - A custom setting that is not a multiple of the resolution supported by the system is rounded to the nearest multiple of that resolution, and the Sampling Collector issues a warning message.