Get the number of hardware counters available on the system. More...
|PAPI_EINVAL||papi.h is different from the version used to compile the PAPI library.|
|PAPI_ENOMEM||Insufficient memory to complete the operation.|
|PAPI_ESYS||A system or C library call failed inside PAPI, see the errno variable.|
int num_hwcntrs; // The installation does not support PAPI if ((num_hwcntrs = PAPI_num_counters()) < 0 ) handle_error(1); // The installation supports PAPI, but has no counters if ((num_hwcntrs = PAPI_num_counters()) == 0 ) fprintf(stderr,"Info:: This machine does not provide hardware counters.\n");
PAPI_num_counters() returns the optimal length of the values array for the high level functions. This value corresponds to the number of hardware counters supported by the current CPU component.