Read and reset counters. More...

Detailed Description

Fortran Interface:: #include "fpapi.h"
PAPIF_read_counters( C_LONG_LONG(*) values, C_INT array_len, C_INT check )

See also: PAPI_read_counters

C Interface:: #include <papi.h>
int PAPI_read_counters( long long *values, int array_len );

Parameters

*values	an array to hold the counter values of the counting events
arry_len	the number of items in the *events array

Precondition: These calls assume an initialized PAPI library and a properly added event set.

Postcondition: The counters are reset and left running after the call.

Return values

PAPI_EINVAL	One or more of the arguments is invalid.
PAPI_ESYS	A system or C library call failed inside PAPI, see the errno variable.

PAPI_read_counters() copies the event counters into the array *values.

do_100events();
if ( PAPI_read_counters( values, num_hwcntrs ) != PAPI_OK )
    handlw_error(1);
// values[0] now equals 100 
do_100events();
if ( PAPI_accum_counters( values, num_hwcntrs ) != PAPI_OK )
    handle_error(1);
// values[0] now equals 200
values[0] = -100;
do_100events();
if ( PAPI_accum_counters(values, num_hwcntrs ) != PAPI_OK )
    handle_error();
// values[0] now equals 0

See also: PAPI_set_opt() PAPI_start_counters()

The documentation for this class was generated from the following file:

papi_fwrappers.c