[petsc-dev] odd log behavior

[Justin Chang]

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

On Tue, Apr 26, 2022 at 2:49 PM Matthew Knepley <knepley at gmail.com> wrote:

> On Tue, Apr 26, 2022 at 12:03 PM Mark Adams <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> 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> wrote:
>>> >
>>> > You have to add -log_view_gpu_time
>>> > See https://gitlab.com/petsc/petsc/-/merge_requests/5056
>>> >
>>> > Jose
>>> >
>>> >
>>> >> El 26 abr 2022, a las 16:39, Mark Adams <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/>
>
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