[petsc-dev] odd log behavior

[Matthew Knepley]

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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