https://manpages.ubuntu.com/manpages/questing/man3/PAPIF_num_hwctrs.3.html
Ubuntu Manpage: PAPIF_num_hwctrs - Return the number of hardware counters on the cpu.
Return the number of hardware counters on the cpu.
https://manpages.ubuntu.com/manpages/questing/man3/PAPI_num_cmp_hwctrs.3.html
Ubuntu Manpage: PAPI_num_cmp_hwctrs - Return the number of hardware counters for the specified...
Return the number of hardware counters for the specified component.