PAPI_flops - PAPI High level: Simplified call to get Mflops/s, real and processor time

CONTENTS

Synopsis
Description
Arguments
Return Values
Notes
Bugs
See Also

C Interface

#include <papi.h> 

int PAPI_flops (float *rtime, float *ptime, long_long *flpins, float *mflops); 

Fortran Interface

#include fpapi.h 

PAPIF_flops(C_FLOAT real_time, C_FLOAT proc_time, C_LONG_LONG flpins, C_FLOAT mflops, C_INT check) 

The first call to PAPI_flops() will initialize PAPI, set up the counters to monitor PAPI_FP_INS and PAPI_TOT_CYC events and start the counters. Subsequent calls will read the counters and return total real time, total process time, total floating point instructions since the start of the measurement and Mflops/s rate since latest call to PAPI_flops() . Any call with flpins = -1 will reinitialize all counters to 0.

*rtime -- total realtime since the first PAPI_flops() call

*ptime -- total process time since the first PAPI_flops() call

*flpins -- total floating point instructions since the first PAPI_flops() call

*mflops -- Mflops/s achieved since the latest PAPI_flops() call

On success, this function returns PAPI_OK.
On error, a non-zero error code is returned.

Most platforms are only capable of counting the number of floating point instructions completed. This may or may not translate to your definition of floating point operations. The measured rate is thus Mflips/s, and will in some circumstances count FMA instructions as one operation. Consult the hardware documentation for your system for specifics.

PAPI_flops() may be called by: 

         

        the user application program 

         

PAPI_flops() contains calls to: 

         

        PAPI_perror() 

        PAPI_library_init() 

        PAPI_get_hardware_info() 

        PAPI_create_eventset() 

        PAPI_add_event() 

        PAPI_start() 

        PAPI_get_real_usec() 

        PAPI_accum() 

        PAPI_shutdown() 

This function has no known bugs.

PAPI_accum (3),
The PAPI Web Site: http://icl.cs.utk.edu/projects/papi