[petsc-dev] funny GPU timer data

[Barry Smith]

  Mark,

    Aside from formatting are you sure there is an issue.   Could it be 100 % of the time and 100% of the flops and since there is not room for all the digits they end up sitting on top of each other? 

   Similarly could the flop rates be overlapped on top of each other?  You could try adding more digits in the print statement to make room for these values.

   Barry
 

> On Dec 29, 2020, at 8:32 AM, Mark Adams <mfadams at lbl.gov> wrote:
> 
> I am seeing this from a GPU kernel.  The % flops is messed up and the flop rate does not look right:
> 
> ------------------------------------------------------------------------------------------------------------------------
> Event                Count      Time (sec)     Flop                              --- Global ---  --- Stage ----  Total   GPU    - CpuToGpu -   - GpuToCpu - GPU
>                    Max Ratio  Max     Ratio   Max  Ratio  Mess   AvgLen  Reduct  %T %F %M %L %R  %T %F %M %L %R Mflop/s Mflop/s Count   Size   Count   Size  %F
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------
> Jac-kernel        13068 1.0 1.6106e+01 1.1 6.13e+13 1.0 0.0e+00 0.0e+00 0.0e+00 10100  0  0  0  10100  0  0  0 136983459       0      0 0.00e+00    0 0.00e+00 100
> 
> I use this in landau.cu <http://landau.cu/>:
> 
>  ierr = PetscLogGpuFlops(flops*nip);CHKERRQ(ierr);
> 
> Any idea what is going on here?
> 
> Thanks,
> Mark

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