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\n",values[0]);
    *

See Also:
    PAPI_create_eventset PAPI_add_event PAPI_stop

Author

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