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

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