PAPI_read - Online Linux Manual PageSection : 3
Updated : September, 2004
Source : PAPI Programmer's Reference
Note : PAPI
NAMEPAPI_read − read hardware counters from an event set PAPI_accum − accumulate and reset counters in an event set
SYNOPSISC Interface #include <papi.h>
int PAPI_read(int EventSet, long_long *values);
int PAPI_accum(int EventSet, long_long *values);Fortran Interface #include "fpapi.h"
PAPIF_read(C_INT EventSet, C_LONG_LONG(*) values, C_INT check)
PAPIF_accum(C_INT EventSet, C_LONG_LONG(*) values, C_INT check)
DESCRIPTIONThese calls assume an initialized PAPI library and a properly added event set. PAPI_read() copies the counters of the indicated event set into the array values. The counters continue counting after the read. PAPI_accum() adds the counters of the indicated event set into the array values. The counters are zeroed and continue counting after the operation. Note the differences between PAPI_read() and PAPI_accum(), specifically that PAPI_accum() resets the values array to zero.
ARGUMENTSEventSet -- an integer handle for a PAPI Event Set as created by "PAPI_create_eventset(3) *values -- an array to hold the counter values of the counting events
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. PAPI_ENOEVST" The event set specified does not exist.
EXAMPLES do_100events();
if (PAPI_read(EventSet, values) != PAPI_OK)
handle_error(1);
/* values[0] now equals 100 */
do_100events();
if (PAPI_accum(EventSet, values) != PAPI_OK)
handle_error(1);
/* values[0] now equals 200 */
values[0] = -100;
do_100events();
if (PAPI_accum(EventSet, values) != PAPI_OK)
handle_error(1);
/* values[0] now equals 0 */
BUGSThese functions have no known bugs.
SEE ALSOPAPI_set_opt(3), PAPI_reset (3)," PAPI_start(3), PAPI (3), PAPIF (3)" 0
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