papi_start_counters(3) [centos man page]

PAPI_start_counters(3)						       PAPI						    PAPI_start_counters(3)

NAME

       PAPI_start_counters -

       Start counting hardware events.

SYNOPSIS

Detailed Description
       @par C Interface:
       int PAPI_start_counters( int *events, int array_len );

       Parameters:
	   *events an array of codes for events such as PAPI_INT_INS or a native event code
	   array_len the number of items in the *events array

       Return values:
	   PAPI_EINVAL One or more of the arguments is invalid.
	   PAPI_EISRUN Counters have already been started, you must call PAPI_stop_counters() before you call this function again.
	   PAPI_ESYS A system or C library call failed inside PAPI, see the errno variable.
	   PAPI_ENOMEM Insufficient memory to complete the operation.
	   PAPI_ECNFLCT The underlying counter hardware cannot count this event and other events in the EventSet simultaneously.
	   PAPI_ENOEVNT The PAPI preset is not available on the underlying hardware.

       PAPI_start_counters() starts counting the events named in the *events array. This function cannot be called if the counters have already
       been started. The user must call PAPI_stop_counters() to stop the events explicitly if he/she wants to call this function again. It is the
       user's responsibility to choose events that can be counted simultaneously by reading the vendor's documentation. The length of the *events
       array should be no longer than the value returned by PAPI_num_counters().

       if( PAPI_start_counters( Events, num_hwcntrs ) != PAPI_OK )
	   handle_error(1);
	*

       See Also:
	   PAPI_stop_counters() PAPI_add_event() PAPI_create_eventset()

Author
       Generated automatically by Doxygen for PAPI from the source code.

Version 5.2.0.0 						  Tue Jun 17 2014					    PAPI_start_counters(3)

Check Out this Related Man Page

PAPI_accum_counters(3)						       PAPI						    PAPI_accum_counters(3)

NAME

       PAPI_accum_counters -

       Accumulate and reset counters.

SYNOPSIS

Detailed Description
       @par C Interface:
       int PAPI_accum_counters( long long *values, int array_len );

       Parameters:
	   *values an array to hold the counter values of the counting events
	   arry_len the number of items in the *events array

       Precondition:
	   These calls assume an initialized PAPI library and a properly added event set.

       Postcondition:
	   The counters are reset and left running after the call.

       Return values:
	   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_accum_counters() adds the event counters into the array *values.

       do_100events();
       if ( PAPI_read_counters( values, num_hwcntrs ) != PAPI_OK )
	   handlw_error(1);
       // values[0] now equals 100
       do_100events();
       if ( PAPI_accum_counters( values, num_hwcntrs ) != PAPI_OK )
	   handle_error(1);
       // values[0] now equals 200
       values[0] = -100;
       do_100events();
       if ( PAPI_accum_counters(values, num_hwcntrs ) != PAPI_OK )
	   handle_error();
       // values[0] now equals 0
	*

       See Also:
	   PAPI_set_opt() PAPI_start_counters()

Author
       Generated automatically by Doxygen for PAPI from the source code.

Version 5.2.0.0 						  Tue Jun 17 2014					    PAPI_accum_counters(3)

Linux and UNIX Man Pages

papi_start_counters(3) [centos man page]

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