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\\n",values[0]);

       See also
           PAPI_create_eventset PAPI_add_event PAPI_stop

Author

       Generated automatically by Doxygen for PAPI from the source code.

Version 7.1.0.0                                  Thu Dec 14 2023                                   PAPI_start(3)