[petsc-dev] odd log behavior

[Zhang, Hong]

Python users including myself would love NaN since NaN is the default missing value marker for reasons of computational speed and convenience. For example, if you load these values into pandas, no extra code is needed to handle them. Other choices such as N/A would require some extra work for text replacement.

The -nan looks a bit weird. There should be a way to get rid of the - sign.

Hong (Mr.)

> On Apr 26, 2022, at 10:52 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
>> 
>