By default, hardware-counter overflow profile data is not collected. To collect this data, specify on.
Print out the list of available counters.
Specify hardware counter name(s) and interval(s).
where:
name is the name of a hardware counter.
interval is the collection interval in milliseconds.
name2 is the name of a second hardware counter.
interval2 is the collection interval in milliseconds.
Hardware counters are system-specific, so the choice of counters available to you depends on the system you are using. Many systems do not support hardware-counter overflow profiling. On these machines, the feature is disabled.