PAPI_read_counters - Online Linux Manual PageSection : 3
Updated : September, 2004
Source : PAPI Programmer's Reference
Note : PAPI
NAMEPAPI_read_counters − PAPI High Level: read and reset counters PAPI_accum_counters − PAPI High Level: accumulate and reset counters
SYNOPSISC Interface #include <papi.h>
int PAPI_read_counters(long_long *values, int array_len);
int PAPI_accum_counters(long_long *values, int array_len);Fortran Interface #include "fpapi.h"
PAPIF_read_counters(C_LONG_LONG(*) values, C_INT array_len, C_INT check)
PAPIF_accum_counters(C_LONG_LONG(*) values, C_INT array_len, C_INT check)
DESCRIPTIONPAPI_read_counters( ) copies the event counters into the array values .
The counters are reset and left running after the call. PAPI_accum_counters( ) adds the event counters into the array values .
The counters are reset and left running after the call. These calls assume an initialized PAPI library and a properly added event set.
ARGUMENTS*values -- an array to hold the counter values of the counting events array_len -- the number of items in the *events array
RETURN VALUESOn success, these functions return PAPI_OK."
On error, a non-zero error code is returned.
ERRORSPAPI_EINVAL" One or more of the arguments is invalid. PAPI_ESYS" A system or C library call failed inside PAPI, see the errno" variable.
EXAMPLES do_100events();
if (PAPI_read_counters(values, num_hwcntrs) != PAPI_OK)
handle_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(1);
/* values[0] now equals 0 */
BUGSThese functions have no known bugs.
SEE ALSOPAPI_start_counters(3)," PAPI_set_opt(3)," PAPI(3), PAPIF (3)" 0
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