[petsc-dev] odd log behavior

[Barry Smith]

> On Apr 26, 2022, at 6:40 PM, Matthew Knepley <knepley at gmail.com> wrote:
> 
> On Tue, Apr 26, 2022 at 6:12 PM Justin Chang <jychang48 at gmail.com <mailto:jychang48 at gmail.com>> wrote:
> I think N/A (not applicable) would be a better message than NaN. Prior to this mail, even I thought I broke something with these NaN's
> 
> We would need some logic to check for NaN and change the format.

  Yes, that should to in another MR.

> 
>    Matt
>  
> On Tue, Apr 26, 2022 at 2:49 PM Matthew Knepley <knepley at gmail.com <mailto:knepley at gmail.com>> wrote:
> On Tue, Apr 26, 2022 at 12:03 PM Mark Adams <mfadams at lbl.gov <mailto:mfadams at lbl.gov>> wrote:
> Well, Nans are a clear sign that something is very wrong.
> 
> Barry chose them so that it could not be mistaken for an actual number.
> 
>    Matt
>  
> On Tue, Apr 26, 2022 at 11:52 AM Jacob Faibussowitsch <jacob.fai at gmail.com <mailto:jacob.fai at gmail.com>> wrote:
> There is an automatic warning that shows when you do run with `-log_view_gpu_time`, but perhaps there should also be an automatic warning when *not* running with it. It is unfortunate that NaN is the value printed as this implies a bug but AFAIK it is unavoidable (Barry can say more on this though).
> 
> Best regards,
> 
> Jacob Faibussowitsch
> (Jacob Fai - booss - oh - vitch)
> 
> > On Apr 26, 2022, at 09:48, Jose E. Roman <jroman at dsic.upv.es <mailto:jroman at dsic.upv.es>> wrote:
> > 
> > You have to add -log_view_gpu_time
> > See https://gitlab.com/petsc/petsc/-/merge_requests/5056 <https://gitlab.com/petsc/petsc/-/merge_requests/5056>
> > 
> > Jose
> > 
> > 
> >> El 26 abr 2022, a las 16:39, Mark Adams <mfadams at lbl.gov <mailto:mfadams at lbl.gov>> escribió:
> >> 
> >> I'm seeing this on Perlmutter with Kokkos-CUDA. Nans in most log timing data except the two 'Solve' lines.
> >> Just cg/jacobi on snes/ex56.
> >> 
> >> Any ideas?
> >> 
> >> VecTDot                2 1.0   nan nan 1.20e+01 1.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   0  0  0  0  0  -nan    -nan      0 0.00e+00    0 0.00e+00 100
> >> VecNorm                2 1.0   nan nan 1.00e+01 1.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   0  0  0  0  0  -nan    -nan      0 0.00e+00    0 0.00e+00 100
> >> VecCopy                2 1.0   nan nan 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   0  0  0  0  0  -nan    -nan      0 0.00e+00    0 0.00e+00  0
> >> VecSet                 5 1.0   nan nan 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   0  0  0  0  0  -nan    -nan      0 0.00e+00    0 0.00e+00  0
> >> VecAXPY                4 1.0   nan nan 2.40e+01 1.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   1  0  0  0  0  -nan    -nan      0 0.00e+00    0 0.00e+00 100
> >> VecPointwiseMult       1 1.0   nan nan 3.00e+00 1.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   0  0  0  0  0  -nan    -nan      0 0.00e+00    0 0.00e+00 100
> >> KSPSetUp               1 1.0   nan nan 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   0  0  0  0  0  -nan    -nan      0 0.00e+00    0 0.00e+00  0
> >> KSPSolve               1 1.0 4.0514e-04 1.0 5.50e+01 1.0 0.0e+00 0.0e+00 0.0e+00  1  0  0  0  0   2  0  0  0  0     0    -nan      0 0.00e+00    0 0.00e+00 100
> >> SNESSolve              1 1.0 2.2128e-02 1.0 5.55e+05 1.0 0.0e+00 0.0e+00 0.0e+00 72 56  0  0  0 100100  0  0  0    25    -nan      0 0.00e+00    0 0.00e+00  0
> > 
> 
> 
> 
> -- 
> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> -- Norbert Wiener
> 
> https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
> 
> 
> -- 
> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> -- Norbert Wiener
> 
> https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>

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