papi_flops(3) [centos man page]

PAPI_flops(3)							       PAPI							     PAPI_flops(3)

NAME

       PAPI_flops -

       Simplified call to get Mflops/s (floating point operation rate), real and processor time.

SYNOPSIS

Detailed Description
       C Interface:
	   #include <papi.h>
	   int PAPI_flops( float *rtime, float *ptime, long long *flpops, float *mflops );

       Parameters:
	   *rtime total realtime since the first call
	   *ptime total process time since the first call
	   *flpops total floating point operations since the first call
	   *mflops incremental (Mega) floating point operations per seconds since the last call

       Return values:
	   PAPI_EINVAL The counters were already started by something other than PAPI_flops().
	   PAPI_ENOEVNT The floating point operations event does not exist.
	   PAPI_ENOMEM Insufficient memory to complete the operation.

       The first call to PAPI_flops() will initialize the PAPI High Level interface, set up the counters to monitor the PAPI_FP_OPS event and
       start the counters.

       Subsequent calls will read the counters and return total real time, total process time, total floating point operations since the start of
       the measurement and the Mflop/s rate since latest call to PAPI_flops(). A call to PAPI_stop_counters() will stop the counters from running
       and then calls such as PAPI_start_counters() or other rate calls can safely be used.

       PAPI_flops returns information related to theoretical floating point operations rather than simple instructions. It uses the PAPI_FP_OPS
       event which attempts to 'correctly' account for, e.g., FMA undercounts and FP Store overcounts, etc.

       See Also:
	   PAPI_flips()

	   PAPI_ipc()

	   PAPI_epc()

	   PAPI_stop_counters()

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

Version 5.2.0.0 						  Tue Jun 17 2014						     PAPI_flops(3)

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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)

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papi_flops(3) [centos man page]

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