table of contents
| PAPI_start(3) | PAPI | PAPI_start(3) |
NAME¶
PAPI_start - Start counting hardware events in an event set.
SYNOPSIS¶
Detailed Description¶
C Interface:
#include <papi.h>
int PAPI_start( int EventSet );
int PAPI_start( int EventSet );
Parameters
EventSet -- an integer handle for a PAPI event set
as created by PAPI_create_eventset
Return values
PAPI_OK
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_ENOEVST -- The EventSet specified does not exist.
PAPI_EISRUN -- The EventSet is currently counting events.
PAPI_ECNFLCT -- The underlying counter hardware can not count this event and other events in the EventSet simultaneously.
PAPI_ENOEVNT -- The PAPI preset is not available on the underlying hardware.
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_ENOEVST -- The EventSet specified does not exist.
PAPI_EISRUN -- The EventSet is currently counting events.
PAPI_ECNFLCT -- The underlying counter hardware can not count this event and other events in the EventSet simultaneously.
PAPI_ENOEVNT -- The PAPI preset is not available on the underlying hardware.
PAPI_start starts counting all of the hardware events contained in the previously defined EventSet. All counters are implicitly set to zero before counting. Assumes an initialized PAPI library and a properly added event set.
Example:
int EventSet = PAPI_NULL;
long long values[2];
int ret;
ret = PAPI_create_eventset(&EventSet);
if (ret != PAPI_OK) handle_error(ret);
// Add Total Instructions Executed to our EventSet
ret = PAPI_add_event(EventSet, PAPI_TOT_INS);
if (ret != PAPI_OK) handle_error(ret);
// Start counting
ret = PAPI_start(EventSet);
if (ret != PAPI_OK) handle_error(ret);
poorly_tuned_function();
ret = PAPI_stop(EventSet, values);
if (ret != PAPI_OK) handle_error(ret);
printf("%lld\n",values[0]);
See also
PAPI_create_eventset PAPI_add_event
PAPI_stop
Author¶
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| Fri Nov 17 2023 | Version 6.0.0.0 |