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 );
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_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
",values[0]);
*
See Also:
PAPI_create_eventset PAPI_add_event PAPI_stop
Author
Generated automatically by Doxygen for PAPI from the source code.
Version 5.2.0.0 Tue Jun 17 2014 PAPI_start(3)