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 names and intervals.
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.