NAME¶

PAPI_num_hwctrs - return the number of hardware counters on the cpu
PAPI_num_cmp_hwctrs - return the number of hardware counters for the specified component

SYNOPSIS¶

C Interface

#include <papi.h>
int PAPI_num_hwctrs();
int PAPI_num_cmp_hwctrs(int cidx);

Fortran Interface

#include fpapi.h
PAPIF_num_hwctrs(C_INT num)

DESCRIPTION¶

PAPI_num_hwctrs() returns the number of physical hardware counters present in the cpu. This is included to preserve backward compatability.

PAPI_num_cmp_hwctrs() returns the number of counters present in the specified component. By convention, component 0 is always the cpu. This count does not include any special purpose registers or other performance hardware. PAPI_library_init(3) must be called in order for this function to return anything greater than 0.

ARGUMENTS¶

cidx -- An integer identifier for a component. By convention, component 0 is always the cpu component.

RETURN VALUES¶

On success, this function returns a value greater than zero.

A zero result usually means the library has not been initialized.

EXAMPLES¶

/* Query the cpu component for the number of counters. */
printf("%d hardware counters found.0, PAPI_num_cmp_hwctrs(0));

BUGS¶

None.

SEE ALSO¶

PAPI_init_library(3), PAPI(3),PAPI_F(3)